CN112562253B

CN112562253B - Smoke sensor, smoke alarm method and smoke alarm device

Info

Publication number: CN112562253B
Application number: CN201910915998.0A
Authority: CN
Inventors: 刘秀华
Original assignee: Hangzhou Haikang Fire Technology Co ltd
Current assignee: Hangzhou Haikang Fire Technology Co ltd
Priority date: 2019-09-26
Filing date: 2019-09-26
Publication date: 2022-06-03
Anticipated expiration: 2039-09-26
Also published as: CN112562253A

Abstract

The embodiment of the invention provides a smoke sensor, a smoke alarm method and a smoke alarm device, which relate to the technical field of sensors and comprise the following steps: dual wavelength transmitting tube 101, first receiving tube 102, second receiving tube 103, main control board and optical maze 104, wherein: the dual-wavelength emission tube is used for alternately emitting infrared light and blue light according to a preset frequency; the dual-wavelength transmitting tube, the first receiving tube and the second receiving tube are positioned in the cavity of the optical maze; the first included angle is larger than 90 degrees, the second included angle is smaller than 90 degrees, the dual-wavelength transmitting tube, the first receiving tube and the second receiving tube are respectively in communication connection with the main control board, and the main control board is used for respectively obtaining a first light quantity value representing light received by the first receiving tube and a second light quantity value representing light received by the second receiving tube and determining whether to generate an alarm signal according to the obtained first light quantity value and/or the obtained second light quantity value. By applying the scheme provided by the embodiment of the invention, the fire can be warned in time.

Description

Smoke sensor, smoke alarm method and smoke alarm device

Technical Field

The invention relates to the technical field of sensors, in particular to a smoke sensor, a smoke alarm method and a smoke alarm device.

Background

With the increase of fire and electricity consumption in modern public places and private places, the frequency of fire disasters is higher and higher, and the harm of the fire disasters to the society and people is more and more serious. To reduce the hazard, a fire needs to be discovered in time.

Since a fire is usually accompanied by smoke generation before the occurrence of the fire, the smoke in the air may be detected first in order to detect the occurrence of the fire in a timely manner. Therefore, there is a need for a smoke sensor, which can detect the smoke concentration in the air to a certain degree, and then determine that there is a possibility of fire and send out an alarm signal to warn the fire in time.

Disclosure of Invention

The embodiment of the invention aims to provide a smoke sensor, a smoke alarm method and a smoke alarm device so as to early warn a fire in time. The specific technical scheme is as follows:

in a first aspect, an embodiment of the present invention provides a smoke sensor, including: dual wavelength transmitting tube (101), first receiving tube (102), second receiving tube (103), main control board and optics maze (104), wherein:

the dual-wavelength emission tube (101) is used for alternately emitting infrared light and blue light according to a preset frequency;

The dual-wavelength transmitting tube (101), the first receiving tube (102) and the second receiving tube (103) are positioned in a cavity of the optical maze 104;

the first included angle is greater than 90 degrees, and the second included angle is less than 90 degrees, wherein, the first included angle is the included angle between first direction and the second direction, the second included angle is: an included angle between the first direction and the third direction, the first direction being: the direction of light is emitted by the dual-wavelength emission tube (101), and the second direction is as follows: a direction in which the first receiving tube (102) receives light along an optical axis of the first receiving tube (102), the third direction being: a direction in which the second receiving tube (103) receives light along an optical axis of the second receiving tube (103);

the dual-wavelength transmitting tube (101), the first receiving tube (102) and the second receiving tube (103) are in communication connection with the main control board respectively;

the main control board is used for respectively obtaining a first light quantity value representing the light received by the first receiving tube (102) and a second light quantity value representing the light received by the second receiving tube (103), and determining whether to generate an alarm signal according to the obtained first light quantity value and/or second light quantity value.

In one embodiment of the present invention, the optical maze (104) comprises: a labyrinth main body (1041) and a labyrinth cover body (1042); the labyrinth main body (1041) and the labyrinth cover body (1042) are installed in a matched mode;

The inner cover surface of the labyrinth cover body (1042) is provided with protruding blocks in a first preset shape in an arrangement mode;

and/or

And the inner side surface of the labyrinth cover body (1042) is provided with a second preset-shaped protruding block in an array mode.

In one embodiment of the invention:

cones are regularly arranged on the inner cover surface of the labyrinth cover body (1042);

and/or

The inner side surface of the labyrinth cover body (1042) is regularly arrayed with prisms.

In one embodiment of the invention, the smoke sensor further comprises: a filter screen (105);

the filter screen (105) is installed outside the optical maze (104).

In one embodiment of the invention, the dual-wavelength transmitting tube (101), the first receiving tube (102) and the second receiving tube (103) are arranged on the inner side wall of the optical maze (104) and are positioned in the same horizontal plane.

In an embodiment of the invention, the determining whether to generate the alarm signal according to the obtained first light value and/or second light value includes:

according to the preset frequency, determining a first light quantity threshold corresponding to the light type of the first received light, and determining a second light quantity threshold corresponding to the light type of the second received light, wherein the first received light is as follows: the first receiving tube (102) receives light, and the second receiving light is: light received by the second receiving tube (103);

Generating an alarm signal in case the first light amount value reaches the determined first light amount threshold value and/or the second light amount value reaches the determined second light amount threshold value.

In an embodiment of the present invention, the determining, according to the preset frequency, a first light amount threshold corresponding to a light type to which the first receiving light belongs includes:

determining a time type of a first time period as a first time type according to the preset frequency, wherein the first time period is as follows: a time period during which the first receiving tube (102) receives the first received light, the time type being: a type indicating when the dual wavelength emission tube (101) is emitting infrared light or a type indicating when the dual wavelength emission tube (101) is emitting blue light;

obtaining a light amount threshold corresponding to a light type of light emitted by the two-wavelength emission tube (101) corresponding to the first time type, and determining the obtained light amount threshold as a first light amount threshold.

In one embodiment of the present invention, the obtaining a first light quantity value representing light received by the first receiving pipe (102) and a second light quantity value representing light received by the second receiving pipe (103) respectively comprises:

Obtaining a voltage across the first receiving tube (102) and taking the obtained voltage as a first light value;

obtaining a voltage across the second receiving tube (103) and taking the obtained voltage as a second light value.

In an embodiment of the invention, said generating an alarm signal in case said first light quantity value reaches a determined first light quantity threshold and/or said second light quantity value reaches a determined second light quantity threshold comprises:

obtaining an infrared light quantity value of infrared light received by the first receiving tube (102) in a current emission period and a blue light quantity value of blue light received by the first receiving tube, wherein the current emission period is as follows: an emission period during which the first receiving tube (102) receives the first received light, the emission period comprising: the dual-wavelength emission tube (101) sequentially emits a time period of infrared light and a time period of blue light;

calculating the ratio of the blue light quantity value to the infrared light quantity value as a first ratio;

and generating an alarm signal when the obtained first light quantity value reaches a first threshold value and/or the obtained second light quantity value reaches a second threshold value and the first ratio reaches a preset smoke threshold value.

obtaining an infrared light quantity value of infrared light received by a target receiving tube in a current emission period and a blue light quantity value of blue light received by the target receiving tube, wherein the target receiving tube is as follows: a first receiving tube (102) and/or a second receiving tube (103), wherein the current transmission period is as follows: an emission period during which the target receiving tube receives the first received light or the second received light, the emission period including: the dual-wavelength emission tube (101) sequentially emits a time period of infrared light and a time period of blue light;

calculating a difference between the blue light quantity value and the infrared light quantity value;

and generating an alarm signal under the condition that the obtained first light quantity value reaches a first threshold value and/or the obtained second light quantity value reaches a second threshold value, and the difference value is smaller than a preset difference value threshold value.

In a second aspect, an embodiment of the present invention further provides a smoke alarm method, which is applied to a main control board in a smoke sensor, where the smoke sensor includes a dual-wavelength transmitting tube (101), a first receiving tube (102), a second receiving tube (103), a main control board, and an optical maze (104), where the dual-wavelength transmitting tube (101) is configured to alternately transmit infrared light and blue light according to a preset frequency, the dual-wavelength transmitting tube (101), the first receiving tube (102), and the second receiving tube (103) are located in a cavity of the optical maze (104), a first included angle is greater than 90 °, a second included angle is smaller than 90 °, the first included angle is an included angle between a first direction and a second direction, and the second included angle is: an included angle between the first direction and the third direction, the first direction being: the direction of the light emitted by the dual-wavelength emission tube (101) is as follows: a direction in which the first receiving tube (102) receives light along an optical axis of the first receiving tube (102), the third direction being: along the optical axis of the second receiving tube (103) and the direction of receiving light by the second receiving tube (103), the dual-wavelength transmitting tube (101), the first receiving tube (102) and the second receiving tube (103) are respectively in communication connection with the main control board, and the method comprises the following steps:

Obtaining a first light quantity value characterizing light received by the first receiving tube (102), a second light quantity value characterizing light received by the second receiving tube (103);

determining whether to generate an alarm signal according to the obtained first light quantity value and/or second light quantity value.

generating an alarm signal in case the first light quantity value reaches the determined first light quantity threshold value and/or the second light quantity value reaches the determined second light quantity threshold value.

determining a time type of a first time period as a first time type according to the preset frequency, wherein the first time period is as follows: a time period during which the first receiving tube (102) receives the first received light is of the type: a type indicating when the dual wavelength emission tube (101) is emitting infrared light or a type indicating when the dual wavelength emission tube (101) is emitting blue light;

A light amount threshold corresponding to the light type of the light emitted by the two-wavelength emission tube 101 corresponding to the first time type is obtained, and the obtained light amount threshold is determined as a first light amount threshold.

obtaining a voltage across the first receiving tube (102) and taking the obtained voltage as a first light quantity value;

and obtaining the voltage at two ends of the second receiving tube (103), and taking the obtained voltage as a second light quantity value.

and generating an alarm signal under the condition that the obtained first light quantity value reaches a first threshold value and/or the second light quantity value reaches a second threshold value and the first ratio reaches a preset smoke threshold value.

In an embodiment of the invention, the generating an alarm signal in case the first light amount value reaches the determined first light amount threshold and/or the second light amount value reaches the determined second light amount threshold comprises:

obtaining an infrared light quantity value of an infrared light received by a target receiving tube in a current emission period and a blue light quantity value of a blue light received by the target receiving tube, wherein the target receiving tube is as follows: a first receiving tube (102) and/or a second receiving tube (103), wherein the current transmission period is: an emission period during which the target receiving tube receives the first received light or the second received light, the emission period including: the dual-wavelength emission tube (101) sequentially emits a time period of infrared light and a time period of blue light;

In a third aspect, an embodiment of the present invention further provides a smoke alarm device, which is applied to a main control board in a smoke sensor, where the smoke sensor includes a dual-wavelength transmitting tube (101), a first receiving tube (102), a second receiving tube (103), a main control board, and an optical maze (104), where the dual-wavelength transmitting tube (101) is configured to alternately transmit infrared light and blue light according to a preset frequency, the dual-wavelength transmitting tube (101), the first receiving tube (102), and the second receiving tube (103) are located in a cavity of the optical maze (104), a first included angle is greater than 90 °, a second included angle is smaller than 90 °, the first included angle is an included angle between a first direction and a second direction, and the second included angle is: an included angle between the first direction and the third direction, the first direction being: the direction of light is emitted by the dual-wavelength emission tube (101), and the second direction is as follows: a direction in which the first receiving tube (102) receives light along an optical axis of the first receiving tube (102), the third direction being: along the optical axis of second receiving tube (103), the direction of receiving the light of second receiving tube (103), dual wavelength transmitting tube (101), first receiving tube (102), second receiving tube (103) respectively with the main control board communication connection, the device includes:

A light quantity obtaining module for obtaining a first light quantity value representing the light received by the first receiving tube (102) and a second light quantity value representing the light received by the second receiving tube (103);

and the signal generation module is used for determining whether to generate an alarm signal according to the obtained first light quantity value and/or second light quantity value.

The embodiment of the invention has the following beneficial effects:

an embodiment of the present invention provides a smoke sensor, including: dual wavelength transmitting tube 101, first receiving tube 102, second receiving tube 103, main control board and optical maze 104, wherein: a dual wavelength emission tube 101 for alternately emitting infrared light and blue light according to a preset frequency; the dual-wavelength transmitting tube 101, the first receiving tube and the second receiving tube are positioned in the cavity of the optical maze 104; the first included angle is greater than 90 degrees, the second included angle is less than 90 degrees, wherein the first included angle is an included angle between the first direction and the second direction, and the second included angle is: the included angle between the first direction and the third direction, the first direction is: the direction of light emitted by the dual-wavelength emission tube 101 is as follows: the direction of the first receiving tube 102 receiving light along the optical axis of the first receiving tube 102 is: a direction in which the second receiving tube 103 receives light along the optical axis of the second receiving tube 103; the dual-wavelength transmitting tube 101, the first receiving tube 102 and the second receiving tube 103 are respectively in communication connection with the main control board; the main control board is configured to obtain a first light quantity value representing light received by the first receiving tube 102 and a second light quantity value representing light received by the second receiving tube 103, and determine whether to generate an alarm signal according to the obtained first light quantity value and/or second light quantity value. Because the first receiving tube 102 and the second receiving tube 103 are distributed differently in the optical maze 104, the smoke sensor can detect the light quantity received by the two receiving tubes through the main control board, so that the detection of black smoke and white smoke can be effectively realized, and because the dual-wavelength transmitting tube 101 alternately emits infrared light and blue light, the smoke sensor can detect large-particle smoke and small-particle smoke, so that the smoke sensor provided by the embodiment can be used for early warning a fire timely and accurately.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a smoke sensor according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of an optical maze according to an embodiment of the present invention;

figure 3 is an exploded view of a smoke sensor according to an embodiment of the present invention;

FIG. 4 is a top view of a labyrinth cover according to an embodiment of the present invention;

FIGS. 5A and 5B are schematic diagrams of light refraction according to an embodiment of the invention;

FIG. 6 is a top view of a labyrinth body provided in accordance with an embodiment of the present invention;

fig. 7 is a schematic flow chart of a smoke alarm method according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a smoke alarm device according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a smoke sensor provided in an embodiment of the present invention, where the smoke sensor includes: dual wavelength transmitting tube 101, first receiving tube 102, second receiving tube 103, main control board and optical maze 104. Wherein:

a dual wavelength emission tube 101 for alternately emitting infrared light and blue light according to a preset frequency;

the dual-wavelength transmitting tube 101, the first receiving tube 102 and the second receiving tube 103 are positioned in the cavity of the optical maze 104;

the first included angle is greater than 90 degrees, the second included angle is less than 90 degrees, wherein the first included angle is an included angle between the first direction and the second direction, and the second included angle is: the included angle between the first direction and the third direction, the first direction is: the direction of light emitted by the dual-wavelength emission tube 101 is as follows: the direction of the first receiving tube 102 receiving light along the optical axis of the first receiving tube 102 is: a direction in which the second receiving tube 103 receives light along the optical axis of the second receiving tube 103;

the dual-wavelength transmitting tube 101, the first receiving tube 102 and the second receiving tube 103 are respectively in communication connection with the main control board;

the main control board is configured to obtain a first light quantity value representing light received by the first receiving tube 102 and a second light quantity value representing light received by the second receiving tube 103, and determine whether to generate an alarm signal according to the obtained first light quantity value and/or second light quantity value.

Because the first receiving tube 102 and the second receiving tube 103 are distributed differently in the optical maze 104, the smoke sensor can detect the light quantity received by the two receiving tubes through the main control board, so that the detection of black smoke and white smoke can be effectively realized, and because the dual-wavelength transmitting tube 101 alternately emits infrared light and blue light, the smoke sensor can detect large-particle smoke and small-particle smoke, so that the smoke sensor provided by the embodiment can be used for early warning a fire timely and accurately.

First, the structure of the smoke sensor will be described in detail.

The dual wavelength emission tube 101 may alternately emit infrared light and blue light. Because the first included angle is greater than 90 degrees, the second included angle is less than 90 degrees, and the optical axis of the dual-wavelength transmitting tube 101 and the optical axes of the two receiving tubes are not on the same straight line, the light emitted by the dual-wavelength transmitting tube 101 cannot be directly received by the receiving tubes, and can reach the receiving tubes only by the scattering of smoke. The infrared light has longer wavelength, and the probability that the infrared light meets and scatters the smoke with large particles in the transmission process is higher, so that the infrared light emitted by the dual-wavelength emission tube 101 is helpful for the smoke sensor to detect the smoke with large particles; the blue light has a shorter wavelength, and the probability that the blue light meets small-particle smoke and scatters during the propagation process is higher, so that the blue light emitted by the dual-wavelength emission tube 101 is helpful for the smoke sensor to detect the small-particle smoke.

The optical axis of the first receiving tube 102 and the optical axis of the second receiving tube 103 are the central lines of the receiving tubes capable of receiving light, and the direction of the optical axis is related to the hardware parameters and the installation position of the receiving tubes. The optical axis of the dual-wavelength transmitting tube 101 is the central line of the emitted light, and the direction of the optical axis is related to the hardware parameters and the installation position of the transmitting tube.

The preset frequency of the dual-wavelength emission tube 101 for emitting the infrared light and the blue light may be 50 milliseconds, 100 milliseconds, 1000 milliseconds, and the like, which is not limited in the embodiment of the present invention.

Such a dual wavelength emission tube 101 can launch infrared light and blue light, helps smoke transducer to the detection of large granule and tiny particle smog, and for an infrared emission tube and a blue light emission tube, the function of two emission tubes can be realized to a dual wavelength emission tube, can reduce the consumption, saves hardware resources moreover.

The optical maze is an incompletely closed cavity, as shown in fig. 2, a dual-wavelength emitting tube 101, a first receiving tube 102 and a second receiving tube 103 are installed in the cavity, so that interference of external light on the two receiving tubes can be prevented, and smoke can be allowed to enter the cavity.

In one embodiment of the present invention, optical maze 104 comprises: the labyrinth body 1041 is a labyrinth cover 1042, as shown in fig. 3. Wherein, the labyrinth main body 1041 and the labyrinth cover 1042 are installed in a matching way.

Specifically, the fitting manner may be an interference fit, or may also be a clearance fit or a transition fit, etc.

In one embodiment of the present invention, the inner cover surface of the labyrinth cover may be arranged with the protruding blocks of the first predetermined shape, as shown in fig. 4. The first preset shape may be a regular shape, such as a cone, a pyramid, a frustum of a pyramid, or an irregular shape, and the arrangement may be regular or random. Thus, the light emitted from the dual-wavelength emission tube 101 can be refracted when it strikes the inner surface of the labyrinth cover 1042, for example, as shown in fig. 5A, the light emitted from the emission tube is refracted when it strikes the rectangular pyramid. The refraction times of the light in the process of reaching the receiving tube are increased, the energy of the light is reduced through refraction, and the purpose of reducing noise is further achieved.

In an embodiment of the present invention, the inner surface of the labyrinth cover 1042 may be regularly arranged with cones, for example, a rectangular pyramid or a triangular pyramid. The labyrinth cover 1042 may also be a regular arrangement of prismatic stages, for example, a triangular prismatic stage, a rectangular prismatic stage, etc. The arrangement may be a matrix arrangement, or an arrangement extending outward from the center.

In one embodiment of the present invention, the inner side of the labyrinth cover may be arranged with the second predetermined shape of the protruding blocks, as shown in fig. 4. The second preset shape may be a regular shape, such as a prism, a prism table, or an irregular shape, and the arrangement may be regular or random. Similarly, the light emitted from the dual wavelength emission tube 101 may be refracted when it strikes the inner surface of the labyrinth cover 1042, for example, as shown in fig. 5B, the light emitted from the emission tube is refracted when it strikes a triangular prism. The refraction times of the light in the process of reaching the receiving tube are increased, the energy of the light is reduced through refraction, and the purpose of reducing noise is further achieved.

In an embodiment of the present invention, the inner side surface of the labyrinth cover may have prisms regularly arranged or may have prisms regularly arranged. The arrangement may be a matrix arrangement, or an arrangement extending outward from the center.

As can be seen from the foregoing description, the dual wavelength transmitting tube 101, the first receiving tube 102, and the second receiving tube 103 are located in the cavity of the optical maze 104. In view of this, in an embodiment of the present invention, the dual wavelength transmitting tube 101, the first receiving tube 102 and the second receiving tube 103 may be installed on the inner sidewall of the optical maze 104 and located in the same horizontal plane. Specifically, the dual wavelength transmitting tube 101, the first receiving tube 102 and the second receiving tube 103 may be embedded in an inner sidewall of the optical maze 104.

In an embodiment of the present invention, the dual-wavelength transmitting tube 101, the first receiving tube 102, and the second receiving tube 103 may also be installed in a distributed manner in the cavity space of the optical maze 104. In particular, the optical maze 104 may be attached by a bracket.

In one embodiment of the present invention, the dual wavelength transmitting tube 101, the first receiving tube 102 and the second receiving tube 103 may not be located in the same plane but located at different heights.

In one embodiment of the present invention, the dual wavelength transmitting tube 101, the first receiving tube 102 and the second receiving tube 103 may be inclined upward at a preset inclination angle, as shown in fig. 6. Therefore, the light emitted by the dual-wavelength emitting tube 101 is not in the same plane with the first receiving tube 102 and the second receiving tube 103, the probability that the emitted light directly reaches the receiving tubes is low, and the light can be received by the receiving tubes only when the smoke concentration reaches a certain degree, so that the accuracy of smoke alarm can be improved, and the probability of false alarm is reduced.

It should be noted that, in the case where the first included angle is greater than 90 ° and the second included angle is less than 90 °, the specific installation positions of the dual-wavelength transmitting tube 101, the first receiving tube 102, and the second receiving tube 103 are not limited.

The first included angle is greater than 90 degrees, and the second included angle is less than 90 degrees. The first included angle may be 100 °, 125 °, 135 °, and the like, and the second included angle may be 30 °, 45 °, 60 °, and the like, which is not limited in the embodiment of the present invention.

The dual-wavelength transmitting tube 101 emits light outwards along the optical axis, and the light is reflected when encountering black smoke particles, in this case, because the first included angle is larger than 90 degrees, that is to say, the installation position of the first receiving tube is in the direction of the light reflection, the light reflected by the black smoke particles can be received, so that the first receiving tube is beneficial to the smoke sensor to detect the black smoke particles; in contrast, when light encounters the white smoke particles, the light can penetrate through the white smoke particles, and the original emission direction is maintained, in this case, since the second included angle is smaller than 90 °, that is, the installation position of the second receiving tube is in the light emitting direction, the light penetrating through the white smoke particles can be received, and therefore, the second receiving tube is helpful for the smoke sensor to detect the white smoke particles.

The dual-wavelength transmitting tube 101, the first receiving tube 102 and the second receiving tube 103 are respectively in communication connection with the main control board. Thus, the main control board can control the on and off of the dual-wavelength transmitting tube 101, the first receiving tube 102 and the second receiving tube 103, and realize the detection of the light quantity received by the first receiving tube 102 and the second receiving tube 103. The main control board can be installed in the optical maze cavity and can also be installed in the smoke sensor shell.

In an embodiment of the present invention, the smoke sensor may further include: a filter screen 105. Filter screen 105 is installed outside optical maze 104, so can prevent that the worm from getting into optical maze, avoids the worm to the detection of smog to produce the interference.

Next, the operation of the smoke sensor will be described in detail.

In an embodiment of the present invention, when obtaining the first light quantity value and the second light quantity value, the main control board may obtain a voltage across the first receiving tube 102, and use the obtained voltage as the first light quantity value; the voltage across the second receiving tube 103 is obtained, and the obtained voltage is taken as the second light quantity value.

The receiver tube includes a section of photo resistance, and under the condition that the receiver tube received illumination, there was electron production removal, produced the electric current promptly, because the receiver tube contains the resistance, electron when removing, and the receiver tube both ends can produce the voltage. The stronger the illumination, the more the receiving tube receives the light, the more electrons are moved, the larger the current, and accordingly the higher the voltage across the receiving tube, so that by obtaining the voltage across the receiving tube, the amount of light received by the receiving tube can be measured.

Because dual wavelength emission tube 101 launches infrared light and blue light according to predetermineeing the frequency, when launching infrared light and blue light at every turn, can last a period of time, the main control board can detect the voltage value at receiving tube both ends in this period of time, obtains the light quantity value according to the voltage value that detects and obtain.

Specifically, the main control board may randomly obtain a voltage value within the period of time as a light quantity value, or obtain a plurality of voltage values according to a preset period, calculate an average value of the plurality of voltage values as the light quantity value, or obtain a highest voltage value and a lowest voltage value within the period of time, and calculate an average value of the highest voltage value and the lowest voltage value as the light quantity value. The embodiments of the present invention are not limited thereto.

In one embodiment of the present invention, the obtained voltage may be enlarged by a preset multiple, and then the enlarged voltage may be used as a light quantity value. For example, the magnification may be 100 times, 500 times, 1000 times, or the like. Since the voltage across the receiving tube has a small value and is difficult to compare with the preset first light quantity threshold and the second light quantity threshold, the voltage is expanded, and the first light quantity value and the second light quantity value can be conveniently judged respectively.

In an embodiment of the present invention, the current value passing through the first receiving tube 102 may be obtained as the first light quantity value, and the current value passing through the second receiving tube 103 may be obtained as the second light quantity value.

In one embodiment of the present invention, the obtained first and second light values can be converted into binary values for representation, which is convenient for the machine to process the first and second light values. Similarly, the obtained first light quantity value and the second light quantity value may be converted into octal values, hexadecimal values, or the like for representation.

In an embodiment of the present invention, when determining whether to generate the alarm signal according to the obtained first light amount value and/or second light amount value, a first light amount threshold corresponding to a light type to which the first receiving light belongs may be determined according to a preset frequency, and a second light amount threshold corresponding to a light type to which the second receiving light belongs may be determined.

In case the first light quantity value reaches the determined first light quantity threshold value and/or the second light quantity value reaches the determined second light quantity threshold value, the concentration of the detected smoke may be considered to be sufficiently large and there is a fire risk, and an alarm signal may be generated, whereas in case the first light quantity threshold value does not reach the first threshold value and the second light quantity value does not reach the second threshold value, no smoke may be considered to be detected or the detected smoke may be small, and thus no alarm signal may be generated.

Wherein the first received light is: the light received by the first receiving tube 102, the second received light is: the light received by the second receiving tube 103. The light type is infrared light or blue light.

In an embodiment of the present invention, the first light amount threshold and the second light amount threshold may be obtained by experiments. Specifically, the smoke sensor may be placed in a smoke environment with a calibrated concentration, for example, a box with smoke with a calibrated concentration, and the main control board detects the amount of light received by the first receiving pipe 102 and the second receiving pipe 103. The amount of light received by the first receiving tube 102 is detected as a first light amount threshold, and the amount of light received by the second receiving tube 103 is detected as a second light amount threshold.

As shown in table 1 below, the dual-wavelength transmitting tube 101 in the smoke sensor can emit infrared light and blue light, and the receiving tube receives different amounts of light when the types of received light are different, that is, the first light amount threshold is divided into a threshold corresponding to the case where the first receiving tube 102 receives infrared light and a threshold corresponding to the case where the received light is blue light, and the second light amount threshold is also divided into a threshold corresponding to the case where the second receiving tube 103 receives infrared light and a threshold corresponding to the case where the received light is blue light. Therefore, in determining the first light amount threshold and the second light amount threshold, it is necessary to consider the light type of the light received by the first received light and the second received light.

TABLE 1

In one embodiment of the present invention, when determining the first light amount threshold corresponding to the light type to which the first received light belongs according to the preset frequency, the time type of the first time period may be determined according to the preset frequency, as the first time type, the light amount threshold corresponding to the light type of the light emitted by the two-wavelength emission tube 101 corresponding to the first time type is obtained, and the obtained light amount threshold is determined as the first light amount threshold.

Wherein the first time period is: the time period during which the first receiving tube 102 receives the first receiving light is: a type indicating when the dual-wavelength emission tube 101 is emitting infrared light, or a type indicating when the dual-wavelength emission tube 101 is emitting blue light.

Since the dual wavelength emission tube 101 emits the infrared light and the blue light at the predetermined frequency, the first receiving tube 102 receives the infrared light and the blue light at the predetermined frequency regardless of the propagation time of the light in the air. For example, as shown in table 2 below, table 2 indicates the time periods for the dual-wavelength emission tube 101 to emit infrared light and blue light, P1 indicates the time period for the dual-wavelength emission tube 101 to emit infrared light, i.e., the time type corresponding to the P1 time period is the type for emitting infrared light, and P2 indicates the time period for the dual-wavelength emission tube 101 to emit blue light, i.e., the time type corresponding to the P2 time period is the type for emitting blue light:

TABLE 2

P1

P2

P1

P2

P1

P2

P1

Infrared light

Blue light

Infrared light

Blue light

Infrared light

Blue light

Infrared light

The time type of the first time period determined according to the preset frequency may be determined according to an alternating frequency of the time type. As can be seen from the above, the alternating frequency of the time type is consistent with the preset frequency of the dual-wavelength emission tube for emitting the infrared light and the blue light, that is, the alternating frequency of the time type is equal to the preset frequency, so that the time type to which the first time period belongs can be determined according to the preset frequency. For example, in the case where the preset frequency is 10 msec, the alternation frequency is also 10 msec, that is, the time pattern is changed every 10 msec.

In addition, it is also possible to obtain a time instant at which the first receiving tube receives the first received light, and determine the time type of the first time period based on the obtained time instant. For example, if the initial time is 0, the preset frequency is 10 ms, and the dual-wavelength emission tube firstly emits infrared light, the time type is infrared light from 0 ms to 10 ms, and the time type is blue light from 10 ms to 20 ms.

Likewise, for the first receiving tube 102, since the time type corresponding to the P1 time period is the type of the infrared light emitted by the dual-wavelength emitting tube 101, the light received by the first receiving tube 102 in the P1 time period is considered as infrared light.

In an embodiment of the present invention, when determining the first light amount threshold corresponding to the light type to which the first receiving light belongs, the light type of the light received by the first receiving tube 102 may also be directly detected, and the first light amount threshold may be determined according to the detected light type.

The step of determining the second light amount threshold is the same as the step of determining the first light amount threshold, and is not repeated herein.

For example, when the first light quantity value and the second light quantity value are measured by a voltage value, the first light quantity threshold and the second light quantity threshold also need to be measured by a voltage; when the first and second light quantity values are enlarged by 1000 times, the first and second light quantity thresholds are also enlarged by 1000 times.

Since the smoke sensor is generally interfered by water vapor, in order to avoid false alarm caused by water vapor, the embodiment of the invention provides the following three schemes for generating the alarm signal. It should be noted that, in practical applications, the solutions provided by the following three embodiments may be used alone, may also be used in combination of two or may be used together with the three embodiments, and there is no order of execution between the solutions provided by the following three embodiments.

In an embodiment of the present invention, when determining whether to generate an alarm signal according to the obtained first light quantity value and/or second light quantity value, an infrared light quantity value of infrared light received by the first receiving tube 102 in a current emission period and a blue light quantity value of blue light received by the first receiving tube may be obtained, and a ratio of the blue light quantity value to the infrared light quantity value is calculated as a first ratio; in the case where the obtained first light quantity value reaches the first threshold value and/or the second light quantity value reaches the second threshold value, and the first ratio reaches the preset smoke threshold value, the detected smoke concentration may be considered to be sufficiently large, and the interference of water vapor may be excluded, thus generating an alarm signal; when the obtained first light quantity value reaches a first threshold value and/or the obtained second light quantity value reaches a second threshold value and the first ratio does not reach a preset smoke threshold value, the smoke sensor is considered to be interfered by water vapor, and an alarm signal is not generated; when the first light quantity threshold value does not reach the first threshold value and the second light quantity value does not reach the second threshold value, it is considered that no smoke is detected or the detected smoke is small, and no alarm signal is generated.

Wherein, the current transmission cycle is: an emission period during which the first receiving tube 102 receives the first received light, the emission period including: the dual wavelength emission tube 101 sequentially emits a period of infrared light and a period of blue light.

For example, it is assumed that the preset frequency of the dual-wavelength emission tube 101 emitting infrared light and blue light is 5 milliseconds, that is, the dual-wavelength emission tube 101 sequentially emits 5 milliseconds infrared light and 5 milliseconds blue light, and in this case, the emission period is 10 milliseconds.

The smoke sensor can be interfered by water vapor, when the water vapor exists, the ratio of the blue light quantity value received by the first receiving tube 102 to the infrared light quantity value is an extremely small numerical value, when the water vapor exists, the ratio is increased, in order to prevent water vapor from being misreported, not only the first light quantity value and the second light quantity value need to be judged, but also the first ratio needs to be judged, under the condition that the first ratio does not reach the smoke threshold value, the smoke sensor can be considered to detect the water vapor, no alarm signal is generated, under the condition that the first threshold value reaches the smoke threshold value, and the first light quantity value reaches the first threshold value and/or the second light quantity value reaches the second threshold value, the smoke sensor is considered to detect the smoke, and therefore the alarm signal is generated. Therefore, the accuracy of the smoke sensor can be increased, and the probability of false alarm caused by water vapor is reduced.

In an embodiment of the present invention, when determining whether to generate the alarm signal according to the obtained first light quantity value and/or second light quantity value, a first infrared light quantity value at which the first receiving tube 102 receives infrared light and a first blue light quantity value at which blue light is received in the current transmission cycle may also be obtained, and a difference between the first blue light quantity value and the first infrared light quantity value may be calculated as a first difference.

In case the obtained first light value reaches a first threshold value and/or the second light value reaches a second threshold value, and the first difference is smaller than a preset first difference threshold value, it is considered that smoke is detected and the interference of water vapor may be excluded, thus generating an alarm signal.

In the case where the obtained first light quantity value reaches the first threshold value and/or the second light quantity value reaches the second threshold value, and the first difference value is not less than the preset first difference value threshold value, it is considered that the smoke sensor is disturbed by water vapor, and thus no alarm signal is generated.

In an embodiment of the present invention, when determining whether to generate the alarm signal according to the obtained first light quantity value and/or second light quantity value, a second infrared light quantity value at which the second receiving tube 103 receives infrared light and a second blue light quantity value at which blue light is received in the current transmission period may also be obtained; and calculating a difference value between the second blue light quantity value and the second infrared light quantity value as a second difference value.

In case the obtained first light value reaches a first threshold value and/or the second light value reaches a second threshold value, and the second difference is smaller than a preset second difference threshold value, it is considered that smoke is detected and the interference of water vapor can be excluded, thus generating an alarm signal.

In case the obtained first light quantity value reaches a first threshold value and/or the second light quantity value reaches a second threshold value, and the second difference value is not less than a preset second difference value threshold value, it is considered that the interference of water vapor is received, and therefore no alarm signal is generated.

Wherein, the above embodiment may be summarized as follows:

obtaining an infrared light quantity value of the infrared light received by the target receiving tube in the current emission period and a blue light quantity value of the blue light received by the target receiving tube, wherein the target receiving tube is as follows: the current transmission period is as follows, the first receiving tube 102 and/or the second receiving tube 103: an emission period during which the target receiving tube receives the first received light or the second received light, the emission period including: the dual-wavelength emission tube (101) sequentially emits a time period of infrared light and a time period of blue light; calculating a difference between the blue light quantity value and the infrared light quantity value; and generating an alarm signal under the condition that the obtained first light quantity value reaches a first threshold value and/or the obtained second light quantity value reaches a second threshold value, and the difference value is smaller than a preset difference value threshold value.

The smoke threshold, the first difference threshold and the second difference threshold related in the above embodiments are preset determination values, and the values may be obtained according to application scenarios and experimental data.

By applying the smoke alarm scheme provided by the embodiment, because the first receiving tube 102 and the second receiving tube 103 are distributed in the optical labyrinth 104 differently, the smoke sensor detects the light quantity received by the two receiving tubes through the main control board, the detection of black smoke and white smoke can be effectively realized, and because the dual-wavelength transmitting tube 101 alternately emits infrared light and blue light, the smoke sensor can detect large-particle smoke and small-particle smoke, so that the smoke sensor provided by the embodiment can timely and accurately warn a fire.

As shown in fig. 7, an embodiment of the present invention provides a smoke alarm method, which is applied to a main control board in a smoke sensor, where the smoke sensor includes a dual-wavelength transmitting tube 101, a first receiving tube 102, a second receiving tube 103, a main control board and an optical maze 104, where the dual-wavelength transmitting tube 101 is configured to alternately transmit infrared light and blue light according to a preset frequency, the dual-wavelength transmitting tube 101, the first receiving tube 102, and the second receiving tube 103 are located in a cavity of the optical maze 104, a first included angle is greater than 90 °, a second included angle is smaller than 90 °, the first included angle is an included angle between a first direction and a second direction, and the second included angle is: an included angle between the first direction and the third direction, the first direction being: the dual-wavelength emission tube 101 emits light in a direction, and the second direction is: a direction along the optical axis of the first receiving tube 102, where the first receiving tube 102 receives light, and the third direction is: along the optical axis of the second receiving tube 103 and the direction of receiving light by the second receiving tube 103, the dual-wavelength transmitting tube 101, the first receiving tube 102 and the second receiving tube 103 are respectively in communication connection with the main control board, and the method includes:

Step 701, obtaining a first light quantity value representing the light received by the first receiving tube 102 and a second light quantity value representing the light received by the second receiving tube 103;

step 702, determining whether to generate an alarm signal according to the obtained first light quantity value and/or second light quantity value.

In an embodiment of the present invention, according to the preset frequency, a first light quantity threshold corresponding to a light type to which the first received light belongs is determined, and a second light quantity threshold corresponding to a light type to which the second received light belongs is determined, where the first received light is: the light received by the first receiving tube 102, the second received light is: the light received by the second receiving tube 103;

In an embodiment of the present invention, a time type of a first time period is determined as the first time type according to the preset frequency, where the first time period is: the time period during which the first receiving tube 102 receives the first receiving light is: a type indicating a time when the dual wavelength emission tube 101 is emitting infrared light, or a type indicating a time when the dual wavelength emission tube 101 is emitting blue light;

In one embodiment of the present invention, the voltage across the first receiving tube 102 is obtained, and the obtained voltage is used as the first light quantity value;

the voltage across the second receiving tube 103 is obtained and the obtained voltage is taken as the second light quantity value.

In an embodiment of the present invention, an infrared light quantity value of infrared light received by the first receiving tube 102 and a blue light quantity value of blue light received by the first receiving tube in a current emission period are obtained, where the current emission period is: an emission period during which the first receiving tube 102 receives the first received light, the emission period including: the dual-wavelength emission tube 101 sequentially emits a time period of infrared light and a time period of blue light;

In one embodiment of the present invention, an infrared light quantity value of an infrared light received by a target receiving tube and a blue light quantity value of a blue light received by the target receiving tube in a current emission cycle are obtained, where the target receiving tube is: a first receiving tube (102) and/or a second receiving tube (103), wherein the current transmission period is: an emission period during which the target receiving tube receives the first received light or the second received light, the emission period including: the dual-wavelength emission tube (101) sequentially emits a time period of infrared light and a time period of blue light;

As shown in fig. 8, an embodiment of the present invention provides a smoke alarm device, which is applied to a main control board in a smoke sensor, where the smoke sensor includes a dual-wavelength transmitting tube 101, a first receiving tube 102, a second receiving tube 103, a main control board and an optical maze 104, where the dual-wavelength transmitting tube 101 is configured to alternately transmit infrared light and blue light according to a preset frequency, the dual-wavelength transmitting tube 101, the first receiving tube 102, and the second receiving tube 103 are located in a cavity of the optical maze 104, a first included angle is greater than 90 °, a second included angle is smaller than 90 °, the first included angle is an included angle between a first direction and a second direction, and the second included angle is: an included angle between the first direction and the third direction, the first direction being: the dual wavelength emission tube 101 emits light in a second direction: a direction along the optical axis of the first receiving tube 102, where the first receiving tube 102 receives light, and the third direction is: along the optical axis of the second receiving tube 103, the direction that the second receiving tube 103 received light, dual wavelength transmitting tube 101, first receiving tube 102, second receiving tube 103 respectively with the main control board communication connection, the device includes:

A light quantity obtaining module 801, configured to obtain a first light quantity value representing light received by the first receiving tube 102 and a second light quantity value representing light received by the second receiving tube 103;

a signal generating module 802, configured to determine whether to generate an alarm signal according to the obtained first light quantity value and/or second light quantity value.

In an embodiment of the present invention, the signal generating module 802 is specifically configured to:

according to the preset frequency, determining a first light quantity threshold corresponding to the light type of the first received light, and determining a second light quantity threshold corresponding to the light type of the second received light, wherein the first received light is as follows: the light received by the first receiving tube 102, the second received light is: the light received by the second receiving tube 103;

In an embodiment of the present invention, a time type of a first time period is determined as the first time type according to the preset frequency, where the first time period is: the first receiving pipe 102 receives the first receiving light for a time period, where the time types are: a type indicating a time when the dual wavelength emission tube 101 is emitting infrared light, or a type indicating a time when the dual wavelength emission tube 101 is emitting blue light;

In an embodiment of the present invention, the light quantity obtaining module 801 is specifically configured to:

obtaining a voltage across the first receiving tube 102, and taking the obtained voltage as a first light quantity value;

obtaining an infrared light quantity value of the infrared light received by the first receiving tube 102 in a current emission period and a blue light quantity value of the blue light received by the first receiving tube, wherein the current emission period is as follows: an emission period during which the first receiving pipe 102 receives the first receiving light, the emission period including: the dual-wavelength emission tube 101 sequentially emits a time period of infrared light and a time period of blue light;

In a further embodiment provided by the present invention, there is also provided a computer readable storage medium having a computer program stored therein, which computer program, when executed by a processor, performs the steps of any of the above-described smoke alarm methods.

In a further embodiment provided by the present invention, there is also provided a computer program product containing instructions which, when run on a computer, cause the computer to perform any of the smoke alarm methods of the above embodiments.

In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.

All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on differences from other embodiments. In particular, the description of the method embodiments, the apparatus embodiments, the computer-readable storage medium embodiments, and the computer program product embodiments is relatively simple in that they are substantially similar to the smoke sensor embodiments, and where relevant, reference is made to the partial description of the method embodiments.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A smoke sensor, characterized in that the smoke sensor comprises: dual wavelength transmitting tube (101), first receiving tube (102), second receiving tube (103), main control board and optics maze (104), wherein:

the first included angle is greater than 90 degrees, and the second included angle is less than 90 degrees, wherein, the first included angle is the included angle between first direction and the second direction, the second included angle is: an included angle between the first direction and the third direction, the first direction being: the direction of the light emitted by the dual-wavelength emission tube (101) is as follows: a direction in which the first receiving tube (102) receives light along an optical axis of the first receiving tube (102), the third direction being: a direction in which the second receiving tube (103) receives light along an optical axis of the second receiving tube (103);

The dual-wavelength transmitting tube (101), the first receiving tube (102) and the second receiving tube (103) are respectively in communication connection with the main control board;

the main control board is used for respectively obtaining a first light quantity value representing the light received by the first receiving tube (102) and a second light quantity value representing the light received by the second receiving tube (103), and determining whether to generate an alarm signal according to the obtained first light quantity value and/or second light quantity value;

the optical maze (104) comprises: a labyrinth main body (1041) and a labyrinth cover body (1042); the labyrinth main body (1041) and the labyrinth cover body (1042) are installed in a matched mode;

the inner cover surface of the labyrinth cover body (1042) is provided with protruding blocks in a first preset shape in an array mode, and the protruding blocks in the first preset shape are used for refracting light irradiated to the inner cover surface; and/or, the inner side surface of the labyrinth cover body (1042) is provided with second preset-shaped protruding blocks which are used for refracting light irradiated to the inner side surface.

2. The smoke sensor according to claim 1,

And/or

The inner side surface of the labyrinth cover body (1042) is regularly provided with prisms.

3. The smoke sensor according to any one of claims 1-2, further comprising: a filter screen (105);

the filter screen (105) is installed outside the optical maze (104).

4. The smoke sensor according to any one of claims 1 to 2,

the dual-wavelength transmitting tube (101), the first receiving tube (102) and the second receiving tube (103) are mounted on the inner side wall of the optical maze (104) and are located in the same horizontal plane.

5. A smoke sensor according to claim 1, wherein said determining whether to generate an alarm signal based on the obtained first and/or second light value comprises:

6. The smoke sensor according to claim 5, wherein said determining a first threshold amount of light corresponding to a light type of the first received light according to the predetermined frequency comprises:

7. A smoke sensor according to claim 5 or 6, wherein said obtaining a first light quantity value characteristic of light received by said first receiving tube (102) and a second light quantity value characteristic of light received by said second receiving tube (103), respectively, comprises:

8. A smoke sensor according to claim 5 or 6, wherein said generating an alarm signal in case said first light value reaches a determined first light threshold value and/or said second light value reaches a determined second light threshold value comprises:

9. A smoke sensor according to claim 5 or 6, wherein said generating an alarm signal in case said first light value reaches a determined first light threshold value and/or said second light value reaches a determined second light threshold value comprises:

10. The utility model provides a smoke alarm method, its characterized in that is applied to the main control board in the smoke transducer, the smoke transducer includes dual wavelength transmitting tube (101), first receiver tube (102), second receiver tube (103), main control board and optics maze (104), wherein, dual wavelength transmitting tube (101) for according to preset frequency emission infrared light sum blue light in turn, dual wavelength transmitting tube (101), first receiver tube (102), second receiver tube (103) are located in the cavity of optics maze (104), first contained angle is greater than 90, and the second contained angle is less than 90, first contained angle is the contained angle between first direction and the second direction, the second contained angle is: an included angle between the first direction and the third direction, the first direction being: the direction of the light emitted by the dual-wavelength emission tube (101) is as follows: a direction in which the first receiving tube (102) receives light along an optical axis of the first receiving tube (102), the third direction being: along the optical axis of the second receiving tube (103) and the direction of receiving light by the second receiving tube (103), the dual-wavelength transmitting tube (101), the first receiving tube (102) and the second receiving tube (103) are respectively in communication connection with the main control board, protruding blocks in a first preset shape are arranged on the inner cover surface of the labyrinth cover body (1042), and the protruding blocks in the first preset shape are used for refracting light irradiated to the inner cover surface; and/or, the inner side surface of the labyrinth cover body (1042) is provided with second preset-shaped protruding blocks which are used for refracting light irradiated to the inner side surface;

The method comprises the following steps:

11. The smoke alarm method according to claim 10, wherein said determining whether to generate an alarm signal based on the obtained first and/or second light value comprises:

12. The smoke alarm method according to claim 10 or 11, wherein said determining a first light amount threshold corresponding to a light type to which the first received light belongs according to the preset frequency comprises:

13. The smoke alarm method of claim 10 or 11, wherein said obtaining a first light value indicative of light received by said first receiving pipe (102) and a second light value indicative of light received by said second receiving pipe (103) comprises:

14. The smoke alarm method according to claim 11, wherein said generating an alarm signal in case said first light value reaches a determined first light threshold value and/or said second light value reaches a determined second light threshold value comprises:

15. The smoke alarm method according to claim 11, wherein said generating an alarm signal in case said first light value reaches a determined first light threshold value and/or said second light value reaches a determined second light threshold value comprises:

16. The utility model provides a smoke alarm device, its characterized in that is applied to the main control board in the smoke transducer, smoke transducer includes dual wavelength transmitting tube (101), first receiver tube (102), second receiver tube (103), main control board and optics maze (104), wherein, dual wavelength transmitting tube (101) for according to preset frequency emission infrared light sum blue light in turn, dual wavelength transmitting tube (101), first receiver tube (102), second receiver tube (103) are located in the cavity of optics maze (104), first contained angle is greater than 90, and the second contained angle is less than 90, first contained angle is the contained angle between first direction and the second direction, the second contained angle is: an included angle between the first direction and the third direction, the first direction being: the direction of the light emitted by the dual-wavelength emission tube (101) is as follows: a direction in which the first receiving tube (102) receives light along an optical axis of the first receiving tube (102), the third direction being: along the optical axis of the second receiving tube (103) and the direction of receiving light by the second receiving tube (103), the dual-wavelength transmitting tube (101), the first receiving tube (102) and the second receiving tube (103) are respectively in communication connection with the main control board, protruding blocks in a first preset shape are arranged on the inner cover surface of the labyrinth cover body (1042), and the protruding blocks in the first preset shape are used for refracting light irradiated to the inner cover surface; and/or, the inner side surface of the labyrinth cover body (1042) is provided with second preset-shaped protruding blocks which are used for refracting light irradiated to the inner side surface;

The device comprises: