CN111289460B - Gas concentration detection equipment, its detection method, control device and storage medium - Google Patents

Abstract

The invention discloses a gas concentration detection method, which comprises the following steps: controlling the light generator to emit first light to the gas to be detected according to the set light characteristic parameters; acquiring a first pressure value detected by a pressure sensor, wherein the first pressure value is data detected by the pressure sensor when first light passes through the gas to be detected and irradiates the pressure sensor; and determining the concentration of the gas to be detected according to the first pressure value. The invention also discloses a control device, a gas concentration detection device and a readable storage medium. The invention aims to improve the gas concentration detection efficiency.

Description

Gas concentration detection equipment, its detection method, control device and storage medium

technical field

The invention relates to the field of lens technology, in particular to a gas concentration detection method, a control device, a gas concentration detection device and a readable storage medium.

Background technique

At present, in the detection of gas concentration, infrared gas sensors are generally used to identify gas components and determine their concentrations based on the near-infrared spectra of different gas molecules and the relationship between gas concentration and absorption intensity. When performing concentration analysis, it is necessary to detect the infrared rays after being affected by the gas through pyroelectric or thermopile infrared detectors, and perform additional spectral analysis on the detection results to determine the concentration of the gas. It can be seen that the current gas concentration analysis process is cumbersome, and the results read by the infrared detector cannot directly represent the gas concentration. Instead, an additional spectral analysis process is required to obtain the characterization parameters of the gas concentration, which affects the efficiency of gas concentration detection.

Contents of the invention

The main purpose of the present invention is to provide a gas concentration detection method, aiming at improving the gas concentration detection efficiency.

In order to achieve the above object, the present invention provides a gas concentration detection method, the gas concentration detection method comprises the following steps:

Control the light generator to emit the first light to the gas to be measured according to the set light characteristic parameters;

Acquiring a first pressure value detected by a pressure sensor, where the first pressure value is data detected by the pressure sensor when the first light irradiates the pressure sensor through the gas to be measured;

The concentration of the gas to be measured is determined according to the first pressure value.

Optionally, the step of determining the concentration of the gas to be tested according to the first pressure value includes:

Obtaining the correspondence between the pressure value detected by the pressure sensor and the gas concentration;

Substituting the first pressure value into the corresponding relationship to obtain the concentration of the gas to be measured.

Optionally, the corresponding relationship is a calculation formula, and the step of substituting the first pressure value into the corresponding relationship to obtain the concentration of the gas to be measured includes:

Substituting the first pressure value into the calculation formula to obtain the concentration of the gas to be measured.

Optionally, the corresponding relationship is a radial basis neural network, and the step of substituting the first pressure value into the corresponding relationship to obtain the concentration of the gas to be measured includes:

inputting the first pressure value into the radial basis neural network;

The output result of the radial basis neural network is used as the concentration of the gas to be measured.

Optionally, before the step of obtaining the corresponding relationship between the first pressure value and the gas to be measured, it may further include:

controlling the light generator to emit the first light to a plurality of gases with known concentrations;

Acquiring a second pressure value correspondingly detected by the pressure sensor, where the second pressure value is detected by the pressure sensor when the first light passes through each gas of known concentration and irradiates the pressure sensor received data;

The corresponding relationship is generated according to the concentration value of each gas with a known concentration and its corresponding second pressure value, and the light characteristic parameter.

Optionally, when the corresponding relationship is a radial basis neural network, the concentration value of each gas with known concentration and its corresponding second pressure value, and the light characteristic parameter are used to generate the The steps for correspondence include:

Based on a genetic algorithm, the radial basis neural network is generated according to the concentration value of each gas with known concentration and its corresponding second pressure value, and the light characteristic parameter.

Optionally, before the step of controlling the light generator to emit the first light to the gas to be measured according to the set light characteristic parameters, it also includes:

Obtain the type of the gas to be measured;

determining said light characteristic parameter according to said type; and/or,

The step of obtaining the corresponding relationship between the pressure value detected by the pressure sensor and the gas concentration includes:

Obtain the type of the gas to be measured;

The corresponding relationship is obtained according to the type.

In addition, in order to achieve the above object, the present application also proposes a control device, which includes: a memory, a processor, and a gas concentration detection program stored in the memory and operable on the processor. When the gas concentration detection program is executed by the processor, the steps of the gas concentration detection method described in any one of the above items are realized.

In addition, in order to achieve the above purpose, this application also proposes a gas concentration detection device, the gas concentration detection device includes:

a light generator for generating light;

a pressure sensor, used to detect the pressure value formed when the light passes through the gas to be measured and irradiates the pressure sensor;

As in the above control device, both the light generator and the pressure sensor are connected to the control device.

In addition, in order to achieve the above purpose, the present application also proposes a readable storage medium, on which a gas concentration detection program is stored, and when the gas concentration detection program is executed by a processor, the above-mentioned The steps of the gas concentration detection method.

A gas concentration detection method proposed by the present invention, the method controls the light generator to emit the first light to the gas to be measured according to the set light characteristic parameters, when the first light passes through the gas to be measured and irradiates the pressure sensor, the pressure is obtained The sensor detects the first pressure value when the first light passes through the gas to be tested and irradiates the pressure sensor, and determines the concentration of the gas to be tested according to the first pressure value. Through the above method, the pressure value detected by the pressure sensor can be directly used as a characterization parameter of the gas concentration, and no additional spectral analysis process is performed after detecting infrared rays, so as to realize the simplification of the gas concentration detection process and improve the efficiency of gas concentration detection.

Description of drawings

Fig. 1 is the structural representation of the gas concentration detection equipment of the embodiment of the present invention

2 is a schematic structural diagram of a hardware operating environment involved in a control device according to an embodiment of the present invention;

3 is a schematic flow diagram of an embodiment of the gas concentration detection method of the present invention;

Fig. 4 is a schematic flowchart of another embodiment of the gas concentration detection method of the present invention.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The main solution of the embodiment of the present invention is: control the light generator to emit the first light to the gas to be measured according to the set light characteristic parameters; obtain the first pressure value detected by the pressure sensor, and the first pressure value is the pressure sensor The data detected when the first light passes through the gas to be tested and irradiates the pressure sensor; the concentration of the gas to be tested is determined according to the first pressure value.

Due to the cumbersome analysis process of the current gas concentration in the existing technology, the results read by the infrared detector cannot directly represent the gas concentration, but an additional spectral analysis process is required to obtain the characterization parameters of the gas concentration, which affects the gas concentration detection. efficiency.

The present invention provides a solution aimed at improving the efficiency of gas concentration detection.

An embodiment of the present invention provides a gas concentration detection device for gas concentration detection, wherein the gas may be a gas containing only one substance, or a mixed gas containing more than one substance.

Referring to FIG. 1 , the gas concentration detection device specifically includes a light generator 1 and a pressure sensor 2 .

The light generator 1 can be used to generate light, such as infrared light, whose light intensity changes with changes in gas concentration. The pressure sensor 2 is specifically a detection module that has different pressure values when subjected to different intensities of light. The specific pressure sensor 2 may be a micro-electromechanical system chip (MEMS chip) sensitive to infrared light. When detecting the gas concentration, the light generator 1 and the pressure sensor are spaced apart, and the pressure sensor 2 is set on the optical path formed by the light emitted by the light generator 1 .

Specifically, referring to FIG. 1 , the gas concentration detection device may also include a gas chamber 3 for loading the gas to be measured. The light generator 1 and the pressure sensor 2 are respectively arranged on both sides of the gas chamber 3 . The light inlet and the light outlet through which light is emitted by the device 1, the light generator 1 is arranged on the side of the light inlet, and the pressure sensor 2 is arranged on the side of the light outlet. In addition, the gas concentration detection device can also include a gas tank 4 for storing the gas to be tested, a gas channel can be provided between the gas tank 4 and the gas chamber 3, and when the concentration detection of the gas to be tested is required, the gas tank 4 is controlled to The gas chamber 3 inputs the gas to be measured.

In other embodiments, the gas concentration detection device may only include the light generator 1 and the pressure sensor 2, and the light generator 1 and the pressure sensor 2 may be directly arranged in the space where the gas to be measured is located, and the gas concentration in the space is detected. .

In addition, in the embodiment of the present invention, a control device is also provided for automatic detection of gas concentration. The above-mentioned gas concentration detecting device may include the control device herein. In other embodiments, the control device can also be set independently of the gas concentration detection device.

Referring to FIG. 2 , the control device may include: a processor 1001 (such as a CPU) and a memory 1002 . Wherein, the memory 1002 may be a high-speed RAM memory, or a stable memory (non-volatile memory), such as a disk memory. Optionally, the memory 1002 may also be a storage device independent of the foregoing processor 1001 .

The memory 1002 , the light generator 1 , the pressure sensor 2 , and the gas tank 4 are all connected to the processor 1001 . The processor 1 can be used to control the generation of light from the light generator 1 , and can also acquire the pressure value collected by the pressure sensor 2 , and can also control the gas tank 4 to deliver gas to the gas chamber.

The memory 1002 as a readable storage medium may include a gas concentration detection program. The processor 1001 can be used to call the gas concentration detection program stored in the memory 1002, and execute the steps in any embodiment of the following gas concentration detection method.

Those skilled in the art can understand that the structure of the device shown in FIG. 2 does not constitute a limitation to the device, and may include more or less components than shown in the figure, or combine some components, or arrange different components.

The embodiment of the present invention also proposes a gas concentration detection method for gas concentration detection, wherein the gas may be a gas containing only one substance, or a mixed gas containing more than one substance.

In one embodiment, referring to FIG. 3 , the gas concentration detection method includes:

Step S10, controlling the light generator to emit the first light to the gas to be measured according to the set light characteristic parameters;

The light characteristic parameter specifically refers to the characteristic parameter of the first light emitted by the light generator. The light characteristic parameter may specifically include the intensity of the first light. In addition, in order to ensure that the test result is more accurate, in addition to the intensity, the light characteristic parameter may also include the wavelength of the first light.

Different gases to be measured may have different optical characteristic parameters. For example, the light characteristic parameter corresponding to CO is a wavelength of 4.65um, and the light characteristic parameter corresponding to CO2 is a wavelength of 2.7um and 4.26um. Before step S10, the type of the gas to be measured may be obtained, and the optical characteristic parameter is determined according to the type. Among them, because different wavelengths have different degrees of hand washing of light, some gases cannot be absorbed in certain wavelengths of light, so the light characteristic parameters are determined based on the type of gas to be measured, so as to ensure the accuracy and effectiveness of detection. sex,

When the gas to be tested contains more than one type of gas, the corresponding light characteristic parameters can be determined based on each type of gas, and the first light is emitted to the gas to be tested according to the determined light characteristic parameters.

Step S20, acquiring a first pressure value detected by a pressure sensor, where the first pressure value is data detected by the pressure sensor when the first light passes through the gas to be measured and irradiates the pressure sensor;

Specifically, it is based on the positional relationship between the light generator and the pressure sensor in the above embodiments. When the light generator emits the first light for a preset duration, it can be considered that the first light passes through the gas to be measured and irradiates the pressure sensor, and at this time, the data detected by the pressure sensor can be obtained as the first pressure value. In addition, before obtaining the first pressure value detected by the pressure sensor, the flow rate of the gas to be measured can be detected, and the pressure data currently detected by the pressure sensor can be read when the detected flow rate is less than or equal to the preset value, so as to avoid excessive flow rate. The impact of gas concentration detection results ensures the accuracy of gas concentration detection results.

Step S30, determining the concentration of the gas to be measured according to the first pressure value.

There may be a pre-established correspondence between the pressure value detected by the pressure sensor and the gas concentration. The form of the corresponding relationship can be specifically set according to requirements, and can be a fitting relationship, a parameter conversion relationship, and the like. Specifically, the comparison relationship may be a mapping table, a formula, a machine learning model, and the like.

Based on the established correspondence, step S30 may specifically include:

Step S31, obtaining the corresponding relationship between the pressure value detected by the pressure sensor and the gas concentration;

Wherein, different types of gases may have different correspondences. When there is only one type of gas to be detected by the device, its corresponding correspondence can be obtained directly. When the equipment needs to detect more than one type of gas, the type of the current gas to be tested can be obtained first, and the corresponding corresponding relationship can be obtained according to the type.

There can be one or more than one corresponding relationship corresponding to the same type of gas according to requirements, and one of them can be selected as the corresponding relationship for determining the concentration of the gas to be measured according to the actual accuracy requirement. For example, the corresponding relationship for the same type of gas may include a fitting formula and a machine learning model. When the allowable error is greater than or equal to a preset threshold, the formula can be selected as the corresponding relationship for determining the concentration of the gas to be measured; When setting the threshold, a machine learning model can be selected as the corresponding relationship for determining the concentration of the gas to be measured.

Step S32, substituting the first pressure value into the corresponding relationship to obtain the concentration of the gas to be measured.

Wherein, different types of corresponding relationships may correspond to different processing manners of the first pressure value.

When the corresponding relationship is a calculation formula, the concentration of the gas to be measured is obtained by substituting the first pressure value into the calculation formula. The calculation formula is specifically a relational expression that only includes the pressure value and the gas concentration as unknowns. The first pressure value is introduced into the calculation formula as a known value parameter, and the value of the gas concentration can be obtained as the concentration of the gas to be measured.

When the corresponding relationship is a machine learning model, such as a radial basis neural network, the first pressure value is input into the radial basis neural network, and the output result of the radial basis neural network is used as the concentration of the gas to be measured.

A gas concentration detection method proposed in this embodiment, the method controls the light generator to emit the first light to the gas to be measured according to the set light characteristic parameters, when the first light passes through the gas to be measured and irradiates the pressure sensor, the obtained The first pressure value detected by the pressure sensor is used to determine the concentration of the gas to be measured according to the first pressure value. Through the above method, the intensity of the first light with the characteristics corresponding to the light characteristic parameters will attenuate after passing through the gas to be tested, and different concentrations have different attenuation effects on the intensity of the first light, so the first light is sensed based on the pressure value detected by the pressure sensor The intensity after light attenuation can be used as a characterization parameter of the gas concentration. There is no need to perform an additional spectral analysis process after detecting infrared rays, so as to simplify the gas concentration detection process and improve the efficiency of gas concentration detection.

Wherein, when the gas concentration detection device is provided with a gas chamber for loading the gas to be measured, in order to further improve the accuracy of the obtained gas concentration detection result, before step S10, it also includes:

Before inputting the gas to be measured into the gas chamber, the light generator is controlled to emit the first light to the gas chamber according to the light characteristic parameters, and when the first light passes through the gas chamber and irradiates the pressure sensor, the second pressure value of the pressure sensor is read. Step S10 is executed after the second pressure value is read. Based on this, step S30 includes, after correcting the first pressure value based on the second pressure value, determining the concentration of the gas to be measured according to the corrected first pressure value.

Through the above method, it can be ensured that the obtained concentration of the gas to be measured can avoid the influence of other factors in the environment, thereby improving the accuracy of detecting the concentration of the gas to be measured.

Further, another embodiment of the gas concentration detection method of the present application is proposed based on the above embodiments. In this embodiment, referring to FIG. 4, before step S31, it also includes:

Step S01, controlling the light generator to emit the first light to a plurality of gases with known concentrations;

The gas with known concentration here is the same type of gas as the gas to be measured and whose concentration is already known. According to the light characteristic parameters corresponding to the type of gas to be measured, the light generator is controlled to emit first light toward a plurality of gases with known concentrations, that is, the same light as that emitted to the gas to be measured in step S10 above.

Step S02, acquiring the second pressure value correspondingly detected by the pressure sensor, the second pressure value being the pressure sensor when the first light passes through each gas of known concentration and irradiates the pressure data detected by the sensor;

The detection data of one pressure sensor is correspondingly obtained for each gas with a known concentration, so as to obtain multiple second pressure values.

Step S03, generating the corresponding relationship according to the concentration value of each gas with known concentration and its corresponding second pressure value, and the light characteristic parameter.

First determine the form of the corresponding relationship, obtain the corresponding fitting structure according to the determined form, and use multiple concentration values and second pressure values corresponding to multiple known concentrations of gases, as well as the light characteristic parameters, as the fitting After determining the unknown parameters in the model, the fitting structure formed based on the parameters is used as the corresponding relationship between the pressure value and the concentration.

Specifically, when the corresponding relationship is in the form of a formula, the relationship between the second pressure value Z and the intensity Y of the first light after gas attenuation can be described as Z=f ₁ (Y, c ₁ ), and the light The relationship between the intensity of the characteristic parameters, the intensity Y of the first light after being attenuated by the gas, and the gas concentration X is described as Y=f ₂ (X, A, c ₂ ), based on the multiple first light in the sample obtained above 2. The pressure value and its corresponding concentration value are fitted to obtain an accurate Z=f ₁ (Y, c ₁ ). Get accurate Y=f ₂ (X, A, c ₂ ), fit the two relational expressions based on Y, and get Z=f ₁ (f ₂ (X, A, c ₂ ), c ₁ ), as a pressure sensor Correspondence between detected pressure value and gas concentration.

In addition, when the corresponding relationship is in the form of a machine learning model, such as a radial basis neural network (RBF neural network), the sample training hyperparameters obtained above can be used in the preset model of the radial basis neural network for which the hyperparameters have been set. The optimal solution of the expansion constant and the weight of the output node in the model, the radial basis neural network formed based on the obtained optimal solution is used as the corresponding relationship between the pressure value detected by the pressure sensor and the gas concentration. Wherein, in order to improve the accuracy of the determined radial basis neural network, based on the genetic algorithm, according to the concentration value of each gas with known concentration and its corresponding second pressure value, and the light characteristic parameter, the generated Radial Basis Neural Networks.

In this embodiment, based on the same conditions as the gas to be tested, the concentration values of a plurality of known concentrations of gases, their corresponding second pressure values, and light characteristic parameters are obtained to generate accurate correspondences, It is ensured that the accurate concentration of the gas to be measured can be obtained by inputting the current first pressure value into the corresponding relationship, thereby improving the accuracy of detecting the concentration of the gas to be measured based on the pressure value.

Among them, since the RBF neural network has a strong nonlinear fitting ability and can map any complex nonlinear relationship, it is applied to generate the corresponding relationship between the gas concentration and the pressure value above, which can realize the accurate detection of the gas concentration.

In addition, the embodiment of the present invention also proposes a readable storage medium, the gas concentration detection program is stored on the readable storage medium, and when the gas concentration detection program is executed by the processor, any one of the above gas concentration detection methods can be realized. The steps in the example.

It should be noted that, as used herein, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or system comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or system. Without further limitations, an element defined by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article or system comprising that element.

The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the technical solution of the present invention can be embodied in the form of a software product in essence or in other words, the part that contributes to the prior art, and the computer software product is stored in a storage medium (such as ROM/RAM) as described above. , magnetic disk, optical disk), including several instructions to make a terminal device (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) execute the method described in each embodiment of the present invention.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technical fields , are all included in the scope of patent protection of the present invention in the same way.

Claims (9)

1. A gas concentration detection method, characterized in that the gas concentration detection method comprises the steps of:

controlling the light generator to emit first light to the gas to be detected according to the set light characteristic parameters;

acquiring a first pressure value detected by a pressure sensor, wherein the first pressure value is data detected by the pressure sensor when the first light passes through the gas to be detected and irradiates the pressure sensor;

determining the concentration of the gas to be detected according to the first pressure value;

the step of determining the concentration of the gas to be measured according to the first pressure value comprises the following steps:

acquiring a corresponding relation between the pressure value detected by the pressure sensor and the gas concentration;

substituting the first pressure value into the corresponding relation to obtain the concentration of the gas to be detected;

the step of acquiring the correspondence between the pressure value detected by the pressure sensor and the gas concentration includes:

when the types of the gases required to be detected by the equipment are more than one, acquiring the types of the gases to be detected;

acquiring the corresponding relation according to the type, wherein the corresponding relation comprises a mapping table, a fitting formula and a machine learning model;

before the step of obtaining the first pressure value of the pressure sensor, the method further includes:

detecting the flow rate of the gas to be detected;

and when the detected flow rate is smaller than or equal to a preset value, executing the step of acquiring the first pressure value of the pressure sensor.

2. The gas concentration detection method according to claim 1, wherein the correspondence is a calculation formula, and the step of substituting the first pressure value into the correspondence to obtain the concentration of the gas to be detected includes:

substituting the first pressure value into the calculation formula to obtain the concentration of the gas to be detected.

3. The gas concentration detection method according to claim 1, wherein the correspondence is a radial basis function network, and the step of substituting the first pressure value into the correspondence to obtain the concentration of the gas to be detected includes:

inputting the first pressure value into the radial basis function network;

and taking the output result of the radial basis function neural network as the concentration of the gas to be detected.

4. A gas concentration detection method according to any one of claims 1 to 3, wherein before the step of acquiring the correspondence between the first pressure value and the gas to be detected, further comprising:

controlling the light generator to emit the first light rays to a plurality of gases with known concentrations respectively;

acquiring a second pressure value detected by the pressure sensor correspondingly, wherein the second pressure value is data detected by the pressure sensor when the first light passes through each gas with known concentration and irradiates the pressure sensor;

and generating the corresponding relation according to the concentration value of each gas with the known concentration, the corresponding second pressure value and the light characteristic parameter.

5. The gas concentration detection method according to claim 4, wherein when the correspondence is a radial basis function network, the step of generating the correspondence from the concentration value of each of the known concentration gases and the corresponding second pressure value thereof, and the light characteristic parameter includes:

based on a genetic algorithm, the radial basis neural network is generated according to the concentration value of each gas with known concentration, the corresponding second pressure value and the optical characteristic parameter.

6. A gas concentration detection method according to any one of claims 1 to 3, wherein before said step of controlling the light generator to emit the first light to the gas to be detected in accordance with the set light characteristic parameter, further comprising:

acquiring the type of the gas to be detected;

and determining the light characteristic parameters according to the types.

7. A control device, characterized in that the control device comprises: a memory, a processor, and a gas concentration detection program stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the gas concentration detection method according to any one of claims 1 to 6.

8. A gas concentration detection apparatus, characterized in that the gas concentration detection apparatus comprises:

a light generator for generating light;

the pressure sensor is used for detecting a pressure value formed when the light rays penetrate through the gas to be detected and then irradiate the pressure sensor;

the control device of claim 7, wherein the light generator and the pressure sensor are both coupled to the control device.

9. A readable storage medium, characterized in that the readable storage medium has stored thereon a gas concentration detection program which, when executed by a processor, implements the steps of the gas concentration detection method according to any one of claims 1 to 6.

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