CN113984841B - Method and device for detecting concentration of various mixed gases - Google Patents
Method and device for detecting concentration of various mixed gases Download PDFInfo
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- CN113984841B CN113984841B CN202111112968.XA CN202111112968A CN113984841B CN 113984841 B CN113984841 B CN 113984841B CN 202111112968 A CN202111112968 A CN 202111112968A CN 113984841 B CN113984841 B CN 113984841B
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Abstract
The invention belongs to the technical field of gas concentration detection, and discloses a method and a device for detecting the concentration of various mixed gases, wherein the method comprises the following steps: acquiring a signal capacity channel of a semiconductor oxide gas sensor, and obtaining a noise intensity relation of the sensor according to the signal capacity channel; acquiring noise spectrum signals of the sensor according to the noise intensity relation, and acquiring concentration and fluctuation spectrum dependency correlation functions of a plurality of different gases according to the noise spectrum signals; sub-band division is carried out on the correlation function, the ratio of response intensity of different gases in sub-bands with different fluctuation spectrum frequencies to the fluctuation average value is obtained, and binary identification sequences of different gases are generated according to the ratio; and obtaining the concentration value of each gas in the mixed gas according to the binary identification sequence. The beneficial effects are that: by decomposing and reconstructing the sensor noise spectrum signals, characteristic noise spectrums of different gases in the corresponding frequency ranges are constructed, and the intelligent recognition algorithm is combined, so that real-time rapid detection of different gas concentrations is realized.
Description
Technical Field
The invention relates to the technical field of gas concentration detection, in particular to a method and a device for detecting the concentration of various mixed gases.
Background
In the working scenario involving the production, storage and transportation of hazardous chemicals, the real-time rapid detection of the concentration of the hazardous gases mixed in the air is of great necessity. If the gas concentration can be monitored rapidly in real time in a high-risk environment, the occurrence of leakage accidents and personal injury accidents possibly caused by the leakage accidents can be effectively prevented. Therefore, the method has great practical significance for the prevention of gas leakage accidents and the later rescue work for the real-time detection of the concentration of the mixed gas.
The early detection of the concentration of the mixed gas mainly uses corresponding detection instruments for each different gas to be detected by technicians to respectively detect the concentration of the different gases, and the detection method has the advantages of simple principle and easy operation, but has the problems of high detection cost and low efficiency because of the fact that the method needs to use different types of sensors for detecting the different gases.
In recent years, with the development of electronic nose technology, the use of novel semiconductor and micromachining technologies to integrate sensors of various principles into the same chip has become a trend to realize an electronic nose detection method for simultaneously detecting various target gases.
Therefore, the invention provides a novel method and a device for simultaneously detecting the concentration of a plurality of mixed gases by using a single sensor, and solves the problem that the detection method or the device is required to depend on a plurality of sensors.
Disclosure of Invention
The purpose of the invention is that: the method and the device for simultaneously detecting the concentration of the multiple mixed gases by using the single sensor are provided, so that the detection method or the device can detect the concentration of different gases in the multiple mixed gases by only one sensor, and the cost and the maintenance difficulty of the detection method or the device are reduced.
In order to achieve the above object, the present invention provides a method for detecting the concentration of a plurality of mixed gases, comprising:
and acquiring a signal capacity channel of the semiconductor oxide gas sensor in a mixed gas sealed environment, and obtaining a noise intensity relation of the semiconductor oxide gas sensor according to the signal capacity channel.
And obtaining noise spectrum signals of the semiconductor oxide sensor according to the noise intensity relation, and obtaining concentration and fluctuation spectrum dependency correlation functions of a plurality of different gases according to the noise spectrum signals.
And carrying out self-carrying division on the correlation functions of the concentration and fluctuation spectrum dependence of a plurality of different gases to obtain the ratio of the response intensity of the different gases in each different fluctuation spectrum frequency sub-band to the fluctuation average value, and generating binary identification sequences of the different gases according to the ratio.
And obtaining the concentration value of each gas in the mixed gas according to the binary identification sequence.
Further, the method includes the steps of obtaining a signal capacity channel of the semiconductor oxide gas sensor in a mixed gas sealed environment, and obtaining a noise intensity relation of the semiconductor oxide gas sensor according to the signal capacity channel, specifically:
acquiring a signal capacity channel according to a first formula, wherein the first formula specifically comprises:
wherein, the liquid crystal display device comprises a liquid crystal display device,
is the measurement time window, R and +.>
Is the resistance response in the measured gas and the reference gas, V is the volume of the sensor film, as is the surface area of the sensor film, d is the thickness of the sensor film, A is the 1/f noise intensity of the electrical conduction noise spectrum, and C is the upper limit of the signal capacity channel;
and calculating and converting the first formula to obtain a noise intensity relation of the semiconductor oxide gas sensor:
wherein Su (f) is Lorentz spectrum, f is frequency; u is the voltage.
Further, the method obtains the noise spectrum signal of the semiconductor oxide sensor according to the noise intensity relation, and obtains the correlation function of the concentration and fluctuation spectrum dependence of a plurality of different gases according to the noise spectrum signal, specifically:
obtaining a noise spectrum signal of the semiconductor oxide sensor according to a second formula, wherein the second formula specifically comprises the following steps:
wherein, the liquid crystal display device comprises a liquid crystal display device,
is a time constant;
the noise spectrumAmplitude of fluctuation of signal
Reflecting the instantaneous fluctuation intensity of the signal under a certain frequency, and obtaining the correlation functions of the concentration and fluctuation spectrum dependence of a plurality of different gases according to a second formula:
wherein, is a main bodyS(fi)Is the change in power density spectrum of the resistance fluctuation in the ith characteristic band,
a calibration constant representing the linear response limit.
Further, the self-carrying division is carried out on the correlation functions of the concentration and the fluctuation spectrum dependence of a plurality of different gases to obtain the ratio of the response intensity of the different gases in each different fluctuation spectrum frequency sub-band to the fluctuation average value, and a binary identification sequence of the different gases is generated according to the ratio, specifically:
carrying out self-carrying division on the correlation functions of the concentration and fluctuation spectrum dependence of a plurality of different gases to obtain ratios of response intensities and fluctuation average values of different gases in subbands of different fluctuation spectrum frequencies, calculating the subband ratio of each fluctuation spectrum frequency according to a third formula, assigning the comparison value according to the ratio, and generating binary identification sequences of different gases according to the assignment, wherein the third formula specifically comprises:
the invention also discloses a device for detecting the concentration of various mixed gases, which is applied to the method for detecting the concentration of various mixed gases, and comprises a detection module and a mixed gas conveying module; the detection module comprises a gas detection cavity, wherein the upper end of the gas detection cavity is provided with a plurality of mixed gas conveying ports which are uniformly distributed, each mixed gas conveying port is connected with a gas output port of a gas hose, and a gas input port of the gas hose is connected with an output end of the mixed gas conveying module; the gas detection cavity is internally provided with a PCB (printed circuit board), an ambient temperature and humidity sensor and a semiconductor oxide gas sensor are arranged on the PCB, and the PCB is used for executing detection methods of various mixed gas concentrations.
Further, the four mixed gas conveying ports are arranged at the upper end of the cylindrical gas detection cavity in a central symmetry mode, the gas hose is provided with four gas output ports, and each gas output port is respectively connected with one mixed gas conveying port; the gas transmission hose is Y-shaped, and comprises a main pipe, a first branch pipe and a second branch pipe, wherein a first port of the main pipe is connected with the output end of the mixed gas transmission module, and a second port of the main pipe is connected with a first port of the first branch pipe and a first port of the second branch pipe; and two gas output ports are arranged on the first branch pipe and the second branch pipe.
Further, the detection module further comprises a data signal serial interface, the data signal serial interface is arranged on the shell of the gas detection cavity, and the data signal serial interface is connected with the PCB circuit board and used for outputting detection results.
Further, the mixed gas delivery module includes: the device comprises a gas storage device, a front-end gas transmission pipeline and a gas pump; the gas storage device is used for storing mixed gas to be detected, the front-end gas pipeline is used for connecting the gas storage device and the gas pump, and the gas pump is used for conveying the mixed gas to the gas hose; the output port of the air pump is provided with a gas flowmeter, the gas flowmeter is used for detecting the flow of input gas, and the gas flowmeter and the air pump form closed-loop feedback and are used for dynamically adjusting the blowing flow of the mixed gas in the gas detection cavity.
Further, the gas detection cavity comprises an upper cover plate and a lower cavity, a mixed gas conveying port is formed in the upper cover plate, a PCB circuit board is arranged in the lower cavity, the PCB circuit board is arranged at the center of the bottom of the lower cavity, and the semiconductor oxide sensor is arranged at the center of the PCB circuit board.
Further, a diffusion fan is further arranged in the gas detection cavity, and the diffusion fan is arranged on the side wall of the gas detection cavity.
Compared with the prior art, the method and the device for detecting the concentration of the various mixed gases have the beneficial effects that: according to the invention, through the decomposition and reconstruction of the sensor noise spectrum signals, the characteristic noise spectrums of different gases in the corresponding frequency ranges are constructed, and the real-time rapid detection of different gas concentrations is realized by combining an intelligent recognition algorithm. The method realizes the real-time detection of the concentration of various mixed gases by only combining a semiconductor oxide gas sensor with a sensor noise spectrum signal, so that the hardware requirements on the detection method are greatly reduced, and the detection device has higher integration level and is convenient to carry. The adoption of a sensor for detection reduces the cost and maintenance difficulty of the device.
Drawings
FIG. 1 is a flow chart of a method for detecting the concentration of a plurality of mixed gases according to the present invention;
FIG. 2 is a schematic structural view of a device for detecting the concentration of a plurality of mixed gases according to the present invention;
in the figure, 1, a detection module; 2. a mixed gas delivery module; 3. a mixed gas delivery port; 4. a connector; 5. a gas hose; 6. an upper cover plate; 7. a lower cavity; 8. a data signal serial interface; 9. an ambient temperature humidity sensor; 10. a PCB circuit board; 11. a diffusion fan; 12. a semiconductor oxide gas sensor; 13. a gas storage device; 14. a front end gas pipeline; 15. an air pump; 16. a gas flow meter.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
Example 1:
referring to fig. 1, the invention discloses a method for detecting the concentration of a plurality of mixed gases, which is applied to the detection of a plurality of mixed gases and mainly comprises the following steps:
step S1, acquiring a signal capacity channel of the semiconductor oxide gas sensor in a mixed gas sealed environment, and obtaining a noise intensity relation of the semiconductor oxide gas sensor according to the signal capacity channel.
And S2, acquiring noise spectrum signals of the semiconductor oxide sensor according to the noise intensity relation, and acquiring concentration and fluctuation spectrum dependency correlation functions of a plurality of different gases according to the noise spectrum signals.
And S3, carrying out self-carrying division on the correlation functions of the concentration and fluctuation spectrum dependence of a plurality of different gases to obtain the ratio of the response intensity of the different gases in each different fluctuation spectrum frequency sub-band to the fluctuation average value, and generating binary identification sequences of the different gases according to the ratio.
And S4, obtaining the concentration value of each gas in the mixed gas according to the binary identification sequence.
In step S1, the signal capacity channel of the semiconductor oxide gas sensor is obtained in the sealed environment of the mixed gas, and the noise intensity relationship of the semiconductor oxide gas sensor is obtained according to the signal capacity channel, which specifically includes:
acquiring a signal capacity channel according to a first formula, wherein the first formula specifically comprises:
wherein, the liquid crystal display device comprises a liquid crystal display device,
is the measurement time window, R and +.>
Is the resistive response in the measured and reference gases, V is the volume of the sensor membrane, as is the surface area of the sensor membrane, d is its thickness, a is the 1/f noise intensity of the electrical conduction noise spectrum, and C is the upper limit of the signal capacity channel.
In this embodiment:
wherein Su (f) is Lorentz spectrum, f is frequency; u is the voltage. A characterizes the 1/f noise intensity of the conductance noise spectrum in a particular sensor by a simplified Hooge formula:
in the embodiment, the concentration detection of the mixed gas can be realized by only using one sensor, so that the problems of high cost and difficult maintenance caused by adopting a plurality of sensors for detection in the prior art are avoided.
In step S2, the noise spectrum signal of the semiconductor oxide sensor is obtained according to the noise intensity relation, and the correlation functions of the concentration and the fluctuation spectrum dependence of the plurality of different gases are obtained according to the noise spectrum signal, specifically:
obtaining a noise spectrum signal of the semiconductor oxide sensor according to a second formula, wherein the second formula specifically comprises the following steps:
wherein, the liquid crystal display device comprises a liquid crystal display device,
is a time constant;
amplitude of fluctuation of the noise spectrum signal
Reflecting the instantaneous fluctuation intensity of the signal under a certain frequency, and obtaining the correlation functions of the concentration and fluctuation spectrum dependence of a plurality of different gases according to a second formula:
wherein, is a main bodyS(fi)Is the change in power density spectrum of the resistance fluctuation in the ith characteristic band,
a calibration constant representing the linear response limit.
In step S3, the self-carrying division is performed on the correlation functions of the concentration and the fluctuation spectrum dependence of the plurality of different gases, so as to obtain the ratio of the response intensity of the different gases in each sub-band of different fluctuation spectrum frequencies to the average value of the fluctuation, and a binary identification sequence of the different gases is generated according to the ratio, which specifically comprises:
carrying out self-carrying division on the correlation functions of the concentration and fluctuation spectrum dependence of a plurality of different gases to obtain ratios of response intensities and fluctuation average values of different gases in subbands of different fluctuation spectrum frequencies, calculating the subband ratio of each fluctuation spectrum frequency according to a third formula, assigning the comparison value according to the ratio, and generating binary identification sequences of different gases according to the assignment, wherein the third formula specifically comprises:
in this embodiment, the fluctuation spectrum data is the signal fluctuation intensity at a certain frequency; subband division is typically performed by performing a fast fourier transform on the spectrum, and then equally dividing the spectrum into 5-6 subbands; the binary identification sequence is determined by the relation between the average value of the fluctuation intensity in each sub-band and the total fluctuation intensity, if the average value of the sub-bands is larger than the total average value, the sub-band is marked as 1, otherwise, the sub-band is marked as 0, and the binary sequence of 1 and 0 is formed.
In step S4, the concentration value of each gas in the mixed gas is obtained according to the binary identification sequence.
Example 2:
referring to fig. 2, the invention also discloses a device for detecting the concentration of various mixed gases, and the method for detecting the concentration of various mixed gases is applied.
The device comprises a detection module 1 and a mixed gas conveying module 2; the detection module 1 comprises a gas detection cavity, wherein a plurality of mixed gas conveying ports 3 which are uniformly distributed are arranged at the upper end of the gas detection cavity, each mixed gas conveying port 3 is connected with a gas output port of a gas hose 5, and a gas input port of the gas hose 5 is connected with an output end of the mixed gas conveying module 2; the gas detection cavity is internally provided with a PCB (printed Circuit Board) 10, the PCB 10 is provided with an ambient temperature and humidity sensor 9 and a semiconductor oxide gas sensor 12, and the PCB 10 is used for executing detection methods of various mixed gas concentrations.
In this embodiment, the temperature and humidity sensor 9 compensates the test signal, and may have drift and fluctuation of the signal under different temperature and humidity environments, so that the measured environmental temperature and humidity can compensate the detection signal, and the test accuracy is improved.
In the present embodiment, the number of the mixed gas delivery ports 3 may be set as needed, but the amount of the gas outputted from each mixed gas port is ensured to be the same, so that the mixed gas can be mixed in the gas detection chamber better.
In this embodiment, the four mixed gas delivery ports 3 are arranged at the upper end of the cylindrical gas detection cavity in a central symmetry manner, the gas hose 5 is provided with four gas output ports, and each gas output port is connected with one mixed gas delivery port 3 respectively; the gas transmission hose 5 is Y-shaped, the gas transmission hose 5 comprises a main pipe, a first branch pipe and a second branch pipe, a first port of the main pipe is connected with the output end of the mixed gas transmission module 2, and a second port of the main pipe is connected with a first port of the first branch pipe and a first port of the second branch pipe; and two mixed gas output ports are arranged on the first branch pipe and the second branch pipe.
In this embodiment, since four gas output ports are provided, the gas hose 5 is also designed accordingly, and the gas can be split by using the Y-shaped gas hose 5, and each branch pipe is provided with a gas output port. The mixed gas delivery port 3 is also provided with a connector 4 for connection with a gas delivery hose 5.
In this embodiment, the four gas output ports adopt identical specifications and designs to ensure that the amount of gas output by each gas output port is identical, so that the gas distribution in the gas detection cavity is more uniform.
In this embodiment, the detection module 1 further includes a data signal serial interface 8, where the data signal serial interface 8 is disposed on the housing of the gas detection cavity, and the data signal serial interface 8 is connected to the PCB 10 for outputting a detection result.
In this embodiment, the mixed gas delivery module 2 includes: the gas storage device 13, the front-end gas pipeline 14 and the gas pump 15; the gas storage device 13 is used for storing mixed gas to be tested, the front-end gas pipeline 14 is used for connecting the gas storage device 13 and the gas pump 15, and the gas pump 15 is used for conveying the mixed gas to the gas hose 5; the output port of the air pump 15 is provided with a gas flowmeter 16, the gas flowmeter 16 is used for detecting the flow of input gas, and the gas flowmeter 16 and the air pump 15 form closed-loop feedback for dynamically adjusting the blowing flow of the mixed gas in the gas detection cavity.
In this embodiment, the closed loop feedback of the flow meter and the air pump 15 is to calculate the volume of the cabin air charged by the flow meter to control the air delivery speed and flow rate of the air pump 15 in a closed loop.
In this embodiment, the gas detection chamber includes upper cover plate 6 and lower cavity 7, be provided with mixed gas delivery port 3 on the upper cover plate 6, be provided with PCB circuit board 10 in the lower cavity 7, PCB circuit board 10 sets up in the center of lower cavity 7 bottom, the semiconductor oxide sensor sets up in the center of PCB circuit board 10.
In this embodiment, a diffusion fan 11 is further disposed in the gas detection chamber, and the diffusion fan 11 is disposed on a sidewall of the gas detection chamber.
In this embodiment, a specific detection process for detecting by using the detection device includes:
(a) When the device is adopted for detection, the device is kept in a horizontal static state, and after one start-up, the sensor is preheated for 20 minutes, and the gas detection cavity is filled with mixed gas;
(b) After the inflation process is stable and diffusion in the gas detection cavity is finished, the power supply of the sensor is cut off so as to eliminate the influence of power supply noise;
(c) After the device is stable for 30 seconds, carrying out primary detection to obtain a noise spectrum signal of the mixed gas;
(d) The digital operation circuit calculates a gas concentration identification sequence to obtain concentration values of all components in the mixed gas;
(e) And (c) circularly operating (b) - (d), and accurately judging the concentration value of each component in the mixed gas after a plurality of times of measurement.
In summary, the method and the device for detecting the concentration of the mixed gas disclosed by the invention have the beneficial effects that: according to the invention, through the decomposition and reconstruction of the sensor noise spectrum signals, the characteristic noise spectrums of different gases in the corresponding frequency ranges are constructed, and the real-time rapid detection of different gas concentrations is realized by combining an intelligent recognition algorithm. The improvement of the method realizes the real-time detection of various mixed gas concentrations by only using one semiconductor oxide gas sensor 12 combined with a sensor noise spectrum signal, so that the hardware requirements on the detection method are greatly reduced, and the detection device has higher integration level and is convenient to carry. The adoption of a sensor for detection reduces the cost and maintenance difficulty of the device.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (8)
1. A method for detecting the concentration of a plurality of mixed gases, comprising:
acquiring a signal capacity channel of the semiconductor oxide gas sensor in a mixed gas sealed environment, and obtaining a noise intensity relation of the semiconductor oxide gas sensor according to the signal capacity channel;
the method comprises the steps of obtaining a signal capacity channel of a semiconductor oxide gas sensor in a mixed gas sealing environment, and obtaining a noise intensity relation of the semiconductor oxide gas sensor according to the signal capacity channel, wherein the noise intensity relation is specifically as follows:
acquiring a signal capacity channel according to a first formula, wherein the first formula specifically comprises:
wherein, the liquid crystal display device comprises a liquid crystal display device,
is the measurement time window, R and +.>
Is the gas to be measuredAnd the resistive response in the reference gas, V is the volume of the sensor membrane, as is the surface area of the sensor membrane, d is the thickness of the sensor membrane, A is the 1/f noise intensity of the electrical conduction noise spectrum, and C is the upper limit of the signal capacity channel;
and calculating and converting the first formula to obtain a noise intensity relation of the semiconductor oxide gas sensor:
wherein Su (f) is Lorentz spectrum, f is frequency; u is voltage;
acquiring noise spectrum signals of the semiconductor oxide sensor according to the noise intensity relation, and acquiring concentration and fluctuation spectrum dependency correlation functions of a plurality of different gases according to the noise spectrum signals;
the method comprises the steps of obtaining noise spectrum signals of a semiconductor oxide sensor according to a noise intensity relation, and obtaining concentration and fluctuation spectrum dependency correlation functions of a plurality of different gases according to the noise spectrum signals, wherein the specific steps are as follows:
obtaining a noise spectrum signal of the semiconductor oxide sensor according to a second formula, wherein the second formula specifically comprises the following steps:
wherein, the liquid crystal display device comprises a liquid crystal display device,
is a time constant;
amplitude of fluctuation of the noise spectrum signal
Reflecting the instantaneous fluctuation intensity of the signal under a certain frequency, and obtaining the correlation functions of the concentration and fluctuation spectrum dependence of a plurality of different gases according to a second formula:
wherein, is a main bodyS(fi)Is the change in power density spectrum of the resistance fluctuation in the ith characteristic band,
a calibration constant representing a linear response limit;
sub-band division is carried out on the correlation functions of the concentration and fluctuation spectrum dependence of a plurality of different gases to obtain the ratio of the response intensity of the different gases in each sub-band with different fluctuation spectrum frequencies to the fluctuation average value, and binary identification sequences of the different gases are generated according to the ratio;
and obtaining the concentration value of each gas in the mixed gas according to the binary identification sequence.
2. The method for detecting the concentration of a plurality of mixed gases according to claim 1, wherein the sub-band division is performed on the correlation function of the concentration and the fluctuation spectrum dependence of a plurality of different gases to obtain the ratio of the response intensity of the different gases in each sub-band of different fluctuation spectrum frequencies to the average value of the fluctuation, and the binary identification sequences of the different gases are generated according to the ratio, specifically:
sub-band division is carried out on the correlation functions of the concentration and fluctuation spectrum dependence of a plurality of different gases to obtain ratios of response intensities and fluctuation average values of different gases in sub-bands of different fluctuation spectrum frequencies, the sub-band ratios of the frequency of each fluctuation spectrum are calculated according to a third formula, the values of the ratios are assigned according to the values of the ratios, and binary identification sequences of different gases are generated according to the assignments, wherein the third formula specifically comprises:
3. a device for detecting the concentration of a plurality of mixed gases, characterized in that the method for detecting the concentration of a plurality of mixed gases according to any one of claims 1 to 2 is applied;
the device comprises a detection module and a mixed gas conveying module;
the detection module comprises a gas detection cavity, wherein the upper end of the gas detection cavity is provided with a plurality of mixed gas conveying ports which are uniformly distributed, each mixed gas conveying port is connected with a gas output port of a gas hose, and a gas input port of the gas hose is connected with an output end of the mixed gas conveying module; the gas detection cavity is internally provided with a PCB (printed circuit board), an ambient temperature and humidity sensor and a semiconductor oxide gas sensor are arranged on the PCB, and the PCB is used for executing detection methods of various mixed gas concentrations.
4. A device for detecting the concentration of a plurality of mixed gases according to claim 3, wherein the number of the mixed gas delivery ports is four, the four mixed gas delivery ports are arranged at the upper end of the cylindrical gas detection chamber in a central symmetry manner, the gas hose is provided with four gas output ports, and each gas output port is respectively connected with one mixed gas delivery port; the gas transmission hose is Y-shaped, and comprises a main pipe, a first branch pipe and a second branch pipe, wherein a first port of the main pipe is connected with the output end of the mixed gas transmission module, and a second port of the main pipe is connected with a first port of the first branch pipe and a first port of the second branch pipe; and two gas output ports are arranged on the first branch pipe and the second branch pipe.
5. A device for detecting the concentration of a plurality of mixed gases according to claim 3, wherein the detection module further comprises a data signal serial interface, the data signal serial interface is arranged on the shell of the gas detection cavity, and the data signal serial interface is connected with the PCB circuit board for outputting the detection result.
6. A device for detecting the concentration of a plurality of mixed gases according to claim 3, wherein the mixed gas delivery module comprises: the device comprises a gas storage device, a front-end gas transmission pipeline and a gas pump; the gas storage device is used for storing mixed gas to be detected, the front-end gas pipeline is used for connecting the gas storage device and the gas pump, and the gas pump is used for conveying the mixed gas to the gas hose; the output port of the air pump is provided with a gas flowmeter, the gas flowmeter is used for detecting the flow of input gas, and the gas flowmeter and the air pump form closed-loop feedback and are used for dynamically adjusting the blowing flow of the mixed gas in the gas detection cavity.
7. The apparatus for detecting concentration of a plurality of mixed gases according to claim 3, wherein the gas detecting chamber comprises an upper cover plate and a lower chamber, the upper cover plate is provided with a mixed gas delivery port, the lower chamber is internally provided with a PCB circuit board, the PCB circuit board is arranged at the center of the bottom of the lower chamber, and the semiconductor oxide sensor is arranged at the center of the PCB circuit board.
8. A device for detecting the concentration of a plurality of mixed gases according to claim 3, wherein a diffusion fan is further provided in the gas detecting chamber, and the diffusion fan is provided on a side wall of the gas detecting chamber.
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