CN107478614B - Pollution degree detection device and detection method of oil smoke concentration sensor - Google Patents
Pollution degree detection device and detection method of oil smoke concentration sensor Download PDFInfo
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- CN107478614B CN107478614B CN201610402951.0A CN201610402951A CN107478614B CN 107478614 B CN107478614 B CN 107478614B CN 201610402951 A CN201610402951 A CN 201610402951A CN 107478614 B CN107478614 B CN 107478614B
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- 238000001514 detection method Methods 0.000 title claims abstract description 162
- 239000000779 smoke Substances 0.000 title claims abstract description 51
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 239000006233 lamp black Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 6
- 230000002238 attenuated effect Effects 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 2
- 230000005855 radiation Effects 0.000 abstract 1
- 239000000428 dust Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
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Abstract
The invention relates to a pollution degree detection device and a detection method of an oil smoke concentration sensor, wherein the oil smoke concentration sensor comprises a detection light emitting device capable of emitting detection light and a detection light receiving device capable of receiving the detection light, and is characterized in that: the detection light emitting device and the detection light receiving device are installed to form an included angle, and the intersection point of the light paths is positioned in the smoke area; the pollution degree detection device comprises an oil smoke concentration conversion module connected with the detection light receiving device, a compensation light source which is arranged near the detection light receiving device and is aligned with the detection light receiving device to irradiate, a second light source which is also arranged near the detection light receiving device and is aligned with the detection light receiving device to irradiate, and a power supply control unit which is connected with the detection light emitting device, the compensation light source and the second light source and supplies power for the detection light emitting device, the compensation light source and the second light source, wherein the power supply control unit is connected with the oil smoke concentration conversion module. The invention can accurately measure the pollution degree of the heat radiation type oil smoke concentration sensor, and can eliminate the influence of natural light on measurement.
Description
Technical Field
The invention relates to a device and a method for detecting pollution degree of a lampblack concentration sensor.
Background
With the development of intelligence, optical sensors are increasingly applied to the field of household appliances, and photoelectric sensors are sensors using photoelectric elements as detection elements. The device comprises a detection light emitting device and a detection light receiving device, wherein the detection light emitting device emits detection light, the detection light receiving device receives the detection light, the intensity of the received detection light changes after the received detection light is refracted by a measured substance (such as oil smoke concentration), and then a photoelectric element is used for further converting a light intensity signal into an electric signal. The photoelectric detection method has the advantages of high precision, quick response, non-contact and the like, and the sensor has multiple measurable parameters, simple structure and flexible and various forms, so that the photoelectric sensor is widely applied to detection and control.
In a specific application scene, the photoelectric sensor may face the risk of sensitivity reduction and even failure caused by pollution of the device by dust or oil stains, so that the maintenance is prompted to play an important role in popularization and application of the sensor by detecting the pollution degree of the optical sensor.
In addition, there are many other kitchen devices, such as: the transparent face mask of the range hood, the transparent panel of the kitchen range, various sensors arranged in the kitchen-temperature sensor, humidity sensor, gas concentration sensor, because of the particularity of its application environment, can be in the intensive region of oil smoke frequently, these devices are very likely to receive dust or greasy dirt to pollute and cause the decline of sensitivity even inefficacy in the course of working, therefore develop the kitchen device pollution degree detection device very realistic meaning, in the prior art, then no such technology and product are known.
Disclosure of Invention
The invention aims to provide a pollution degree detection device capable of measuring the pollution degree of an oil smoke concentration sensor aiming at the prior art.
The invention further aims to provide a detection method of the pollution degree detection device capable of measuring the pollution degree of the oil smoke concentration sensor aiming at the prior art.
The technical scheme adopted for solving the technical problems is as follows: a pollution degree detection device of a smoke concentration sensor, the smoke concentration sensor comprising a detection light emitting device capable of emitting detection light and a detection light receiving device capable of receiving the detection light, characterized in that: the detection light emitting device and the detection light receiving device are installed and form an included angle, namely: an included angle is formed after the straight line where the emission direction of the detection light emitting device is located and the straight line where the receiving direction of the detection light receiving device is located are intersected, and the intersection point of the two straight lines is located in a smoke area; the pollution degree detection device comprises an oil smoke concentration conversion module connected with the detection light receiving device, a compensation light source which is arranged near the detection light receiving device and is aligned with the detection light receiving device to irradiate, a second light source which is also arranged near the detection light receiving device and is aligned with the detection light receiving device to irradiate, and a power supply control unit which is connected with the detection light emitting device, the compensation light source and the second light source and supplies power for the detection light emitting device, the compensation light source and the second light source, wherein the power supply control unit is connected with the oil smoke concentration conversion module.
As an improvement, the light-transmitting part capable of shielding the lampblack for the detection light-receiving device is arranged in front of the detection light-receiving device, the second light source is arranged in front of the light-transmitting part, so that the light emitted by the second light source directly irradiates the detection light-receiving device after passing through the light-transmitting part, the polluted condition of the light-transmitting part can be regarded as the polluted condition of the detection light-receiving device, and when the detection light-receiving device is replaced, only the polluted light-transmitting part is required to be replaced, and the detection light-receiving device is not required to be replaced.
The light-transmitting component is a lens or a light-transmitting component in glass or kitchen electric products.
The technical scheme adopted for solving the further technical problems is as follows: the detection method of the pollution degree detection device with the structure is characterized by comprising the following steps of: at factory calibration, in the absence of oil smoke in the smoke zone, the original calibration signal is measured to detect when the light receiving device is not contaminated by:
the power supply control unit supplies power to the second light source and the compensation light source respectively in a high-frequency pulse mode, and when the second light source is turned on, the compensation light source is turned off, and when the compensation light source is turned on, the second light source is turned off; the power supply mode of the power supply control unit for the compensation light source is as follows: at least in the period that the second light source is turned off and on, the signals received by the detection light receiving device are the same;
therefore, when the second light source is turned off and the compensating light source is turned on for half a period, the signal received by the light receiving device is detected=the compensating light signal+the ambient light signal;
detecting a signal received by the light receiving device = a second light source correlation light signal + an ambient light signal in the half period of turning on the second light source and turning off the compensation light source;
because the power supply control unit supplies power to the compensation light source, the signals received by the detection light receiving device are the same in the period that the second light source is turned off and turned on, so that the correlation light signal=compensation light signal of the second light source is obtained through conversion; the compensation light signal at the moment is regarded as an original calibration signal when the light receiving device is detected to be not polluted;
after the oil smoke concentration sensor is used for a period of time, the degree of pollution of the light receiving device is measured and detected by the following method:
the power supply control unit supplies power to the second light source and the compensation light source respectively in a high-frequency pulse mode, and when the second light source is turned on, the compensation light source is turned off, and when the compensation light source is turned on, the second light source is turned off; the power supply mode of the power supply control unit for the compensation light source is as follows: at least in the period that the second light source is turned off and on, the signals received by the detection light receiving device are the same;
therefore, when the second light source is turned off and the compensating light source is turned on for half a period, the signal received by the light receiving device is detected=the compensating light signal+the ambient light signal;
detecting a signal received by the light receiving device = a second light source correlation light signal + an ambient light signal in the half period of turning on the second light source and turning off the compensation light source;
because the power supply control unit supplies power to the compensation light source, the signals received by the detection light receiving device are the same in the period that the second light source is turned off and turned on, so that the correlation light signal=compensation light signal of the second light source is obtained through conversion; and comparing the compensation light signal measured at the moment with an original calibration signal when the detection light receiving device is not polluted, if the signal is attenuated, judging that the detection light receiving device is polluted, and judging the pollution degree according to the attenuation degree, wherein the attenuation degree is larger, and the pollution degree is larger.
As an improvement, the smoke zone is judged to be free of oil smoke by:
the second light source is always kept to be turned off, the power supply control unit supplies power to the detection light emitting device and the compensation light source respectively in a high-frequency pulse mode, when the detection light emitting device is turned on, the compensation light source is turned off, and when the compensation light source is turned on, the detection light emitting device is turned off; the power supply mode of the power supply control unit for the compensation light source is as follows: at least in the period that the detection light emitting device is turned off and on, the signals received by the detection light receiving device are the same;
therefore, in the half period of turning off the detection light emitting device and turning on the compensation light source, the signal received by the detection light receiving device=compensation light signal+ambient light signal;
when the detection light emitting device is turned on and the compensation light source is turned off in the half period, the signal received by the detection light receiving device is=the oil smoke scattered light signal and the environment light signal;
because the power supply control unit supplies power to the compensation light source, the signals received by the detection light receiving device are the same in the period of turning off and on the detection light receiving device, so that the lampblack scattered light signal = compensation light signal is obtained through conversion; and the compensation light signal is always zero in a period of time, and the smoke area is considered to be free of lampblack.
Compared with the prior art, the invention has the advantages that: by arranging the oil smoke concentration conversion module, the compensation light source, the second light source and the power supply control unit and by the coordination work of the compensation light source and the second light source, the pollution degree of the heat dissipation type oil smoke concentration sensor can be accurately measured, and the influence of natural light on measurement can be eliminated.
Drawings
Fig. 1 is a schematic view of a component mounting structure of a pollution level detecting device of an oil smoke concentration sensor in an embodiment of the invention.
Fig. 2 is a block diagram of a pollution level detecting device of an oil smoke concentration sensor according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
As shown in fig. 1 and fig. 1, the pollution level detection device of the oil smoke concentration sensor includes a detection light emitting device 1 capable of emitting detection light and a detection light receiving device 2 capable of receiving the detection light, and an included angle is formed between the detection light emitting device and the detection light receiving device after the detection light emitting device and the detection light receiving device are installed, namely: the straight line where the emission direction of the detection light emitting device is located and the straight line where the receiving direction of the detection light receiving device is located are intersected to form an included angle, the included angle is 60-180 degrees, preferably 90-150 degrees, and the intersection point of the two straight lines is located in the smoke area A. The distance between the end part of the light detection transmitting device and the end part of the light detection receiving device is 3 cm-10 cm; the pollution degree detection device comprises an oil smoke concentration conversion module 3 connected with the detection light receiving device, a compensation light source 4 which is arranged near the detection light receiving device and aligned with the detection light receiving device to irradiate, a second light source 5 which is also arranged near the detection light receiving device and aligned with the detection light receiving device to irradiate, and a power supply control unit 6 which is connected with the detection light emitting device, the compensation light source and the second light source and supplies power for the three, wherein the power supply control unit is connected with the oil smoke concentration conversion module 3. The light-transmitting component 7 capable of shielding the lampblack for the detection light-receiving device is arranged in front of the detection light-receiving device, the second light source 5 is arranged in front of the light-transmitting component 7, so that light rays emitted by the second light source penetrate through the light-transmitting component and then directly penetrate the detection light-receiving device, and the light-transmitting component can be a lens or a light-transmitting component in glass or kitchen electric products.
The detection method of the pollution degree detection device comprises the following steps: at factory calibration, in the absence of oil smoke in the smoke zone, the original calibration signal is measured to detect when the light receiving device is not contaminated by:
the power supply control unit supplies power to the second light source and the compensation light source respectively in a high-frequency pulse mode, and when the second light source is turned on, the compensation light source is turned off, and when the compensation light source is turned on, the second light source is turned off; the power supply mode of the power supply control unit for the compensation light source is as follows: at least in the period that the second light source is turned off and on, the signals received by the detection light receiving device are the same;
therefore, when the second light source is turned off and the compensating light source is turned on for half a period, the signal received by the light receiving device is detected=the compensating light signal+the ambient light signal;
detecting a signal received by the light receiving device = a second light source correlation light signal + an ambient light signal in the half period of turning on the second light source and turning off the compensation light source;
because the power supply control unit supplies power to the compensation light source, the signals received by the detection light receiving device are the same in the period that the second light source is turned off and turned on, so that the correlation light signal=compensation light signal of the second light source is obtained through conversion; the compensation light signal at the moment is regarded as an original calibration signal when the light receiving device is detected to be not polluted;
after the oil smoke concentration sensor is used for a period of time, the degree of pollution of the light receiving device is measured and detected by the following method:
the power supply control unit supplies power to the second light source and the compensation light source respectively in a high-frequency pulse mode, and when the second light source is turned on, the compensation light source is turned off, and when the compensation light source is turned on, the second light source is turned off; the power supply mode of the power supply control unit for the compensation light source is as follows: at least in the period that the second light source is turned off and on, the signals received by the detection light receiving device are the same;
therefore, when the second light source is turned off and the compensating light source is turned on for half a period, the signal received by the light receiving device is detected=the compensating light signal+the ambient light signal;
detecting a signal received by the light receiving device = a second light source correlation light signal + an ambient light signal in the half period of turning on the second light source and turning off the compensation light source;
because the power supply control unit supplies power to the compensation light source, the signals received by the detection light receiving device are the same in the period that the second light source is turned off and turned on, so that the correlation light signal=compensation light signal of the second light source is obtained through conversion; comparing the compensation light signal measured at the moment with an original calibration signal when the detection light receiving device is not polluted, if the signal is attenuated, considering that the detection light receiving device is polluted, and judging the pollution degree according to the attenuation degree, wherein the greater the attenuation degree is, the greater the pollution degree is;
in the detection method, the smoke zone is judged to be free of oil smoke by the following method:
the second light source is always kept to be turned off, the power supply control unit supplies power to the detection light emitting device and the compensation light source respectively in a high-frequency pulse mode, when the detection light emitting device is turned on, the compensation light source is turned off, and when the compensation light source is turned on, the detection light emitting device is turned off; the power supply mode of the power supply control unit for the compensation light source is as follows: at least in the period that the detection light emitting device is turned off and on, the signals received by the detection light receiving device are the same;
therefore, in the half period of turning off the detection light emitting device and turning on the compensation light source, the signal received by the detection light receiving device=compensation light signal+ambient light signal;
when the detection light emitting device is turned on and the compensation light source is turned off in the half period, the signal received by the detection light receiving device is=the oil smoke scattered light signal and the environment light signal;
because the power supply control unit supplies power to the compensation light source, the signals received by the detection light receiving device are the same in the period of turning off and on the detection light receiving device, so that the lampblack scattered light signal = compensation light signal is obtained through conversion; and the compensation light signal is always zero in a period of time, and the smoke area is considered to be free of lampblack.
Claims (4)
1. A pollution degree detection device of a smoke concentration sensor, the smoke concentration sensor comprising a detection light emitting device capable of emitting detection light and a detection light receiving device capable of receiving the detection light, characterized in that: the detection light emitting device and the detection light receiving device are installed and form an included angle, namely: an included angle is formed after the straight line where the emission direction of the detection light emitting device is located and the straight line where the receiving direction of the detection light receiving device is located are intersected, and the intersection point of the two straight lines is located in a smoke area; the pollution degree detection device comprises an oil smoke concentration conversion module connected with the detection light receiving device, a compensation light source which is arranged near the detection light receiving device and is aligned with the detection light receiving device to irradiate, a second light source which is also arranged near the detection light receiving device and is aligned with the detection light receiving device to irradiate, and a power supply control unit which is connected with the detection light emitting device, the compensation light source and the second light source and supplies power for the detection light emitting device, the compensation light source and the second light source, wherein the power supply control unit is connected with the oil smoke concentration conversion module;
the detection method of the pollution degree detection device comprises the following steps: at factory calibration, in the absence of oil smoke in the smoke zone, the original calibration signal is measured to detect when the light receiving device is not contaminated by:
the power supply control unit supplies power to the second light source and the compensation light source respectively in a high-frequency pulse mode, and when the second light source is turned on, the compensation light source is turned off, and when the compensation light source is turned on, the second light source is turned off; the power supply mode of the power supply control unit for the compensation light source is as follows: at least in the period that the second light source is turned off and on, the signals received by the detection light receiving device are the same;
therefore, when the second light source is turned off and the compensating light source is turned on for half a period, the signal received by the light receiving device is detected=the compensating light signal+the ambient light signal;
detecting a signal received by the light receiving device = a second light source correlation light signal + an ambient light signal in the half period of turning on the second light source and turning off the compensation light source;
because the power supply control unit supplies power to the compensation light source, the signals received by the detection light receiving device are the same in the period that the second light source is turned off and turned on, so that the correlation light signal=compensation light signal of the second light source is obtained through conversion; the compensation light signal at the moment is regarded as an original calibration signal when the light receiving device is detected to be not polluted;
after the oil smoke concentration sensor is used for a period of time, the degree of pollution of the light receiving device is measured and detected by the following method:
the power supply control unit supplies power to the second light source and the compensation light source respectively in a high-frequency pulse mode, and when the second light source is turned on, the compensation light source is turned off, and when the compensation light source is turned on, the second light source is turned off; the power supply mode of the power supply control unit for the compensation light source is as follows: at least in the period that the second light source is turned off and on, the signals received by the detection light receiving device are the same;
therefore, when the second light source is turned off and the compensating light source is turned on for half a period, the signal received by the light receiving device is detected=the compensating light signal+the ambient light signal;
detecting a signal received by the light receiving device = a second light source correlation light signal + an ambient light signal in the half period of turning on the second light source and turning off the compensation light source;
because the power supply control unit supplies power to the compensation light source, the signals received by the detection light receiving device are the same in the period that the second light source is turned off and turned on, so that the correlation light signal=compensation light signal of the second light source is obtained through conversion; and comparing the compensation light signal measured at the moment with an original calibration signal when the detection light receiving device is not polluted, if the signal is attenuated, judging that the detection light receiving device is polluted, and judging the pollution degree according to the attenuation degree, wherein the attenuation degree is larger, and the pollution degree is larger.
2. The pollution level detection device according to claim 1, wherein: the light-transmitting component capable of shielding the lampblack for the detection light-receiving device is arranged in front of the detection light-receiving device, and the second light source is arranged in front of the light-transmitting component, so that light rays emitted by the second light source penetrate through the light-transmitting component and then directly penetrate the detection light-receiving device.
3. The pollution level detection device according to claim 2, wherein: the light-transmitting component is a lens or a light-transmitting component in glass or kitchen electric products.
4. The pollution level detection device according to claim 1, wherein: judging that the smoke area is free of oil smoke by the following method:
the second light source is always kept to be turned off, the power supply control unit supplies power to the detection light emitting device and the compensation light source respectively in a high-frequency pulse mode, when the detection light emitting device is turned on, the compensation light source is turned off, and when the compensation light source is turned on, the detection light emitting device is turned off; the power supply mode of the power supply control unit for the compensation light source is as follows: at least in the period that the detection light emitting device is turned off and on, the signals received by the detection light receiving device are the same;
therefore, in the half period of turning off the detection light emitting device and turning on the compensation light source, the signal received by the detection light receiving device=compensation light signal+ambient light signal;
when the detection light emitting device is turned on and the compensation light source is turned off in the half period, the signal received by the detection light receiving device is=the oil smoke scattered light signal and the environment light signal;
because the power supply control unit supplies power to the compensation light source, the signals received by the detection light receiving device are the same in the period of turning off and on the detection light receiving device, so that the lampblack scattered light signal = compensation light signal is obtained through conversion; and the compensation light signal is always zero in a period of time, and the smoke area is considered to be free of lampblack.
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| CN108918547B (en) * | 2018-04-27 | 2021-06-04 | 九阳股份有限公司 | Range hood cleanliness detection device |
| CN113701214B (en) * | 2021-07-21 | 2022-12-02 | 华帝股份有限公司 | Control method of range hood with smoke sensor and range hood |
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