CN112147280B - Remote calibration method for sensor for monitoring ambient air and ambient air quality monitoring device - Google Patents

Remote calibration method for sensor for monitoring ambient air and ambient air quality monitoring device Download PDF

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Publication number
CN112147280B
CN112147280B CN202010925654.0A CN202010925654A CN112147280B CN 112147280 B CN112147280 B CN 112147280B CN 202010925654 A CN202010925654 A CN 202010925654A CN 112147280 B CN112147280 B CN 112147280B
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air
gas
sensor
ambient air
detection
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CN112147280A (en
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葛衍珍
田启明
张文仓
徐新胜
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Beijing Yingshi Ruida Technology Co ltd
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Beijing Yingshi Ruida Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0006—Calibrating gas analysers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
    • G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/42—Determining position
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00—Control of flow
    • G05D7/06—Control of flow characterised by the use of electric means
    • G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The invention provides a remote calibration method of a sensor for monitoring ambient air, which adopts a server, an ambient air monitoring mobile terminal and an air quality standard monitoring station to remotely calibrate the sensor of an ambient air quality monitoring device. The invention also provides an ambient air quality monitoring device for ambient air monitoring, which comprises a shell and an air quality monitoring system positioned in the shell, wherein a sensor is arranged in the air quality monitoring system, and the ambient air quality monitoring device is applied to the remote calibration method of the sensor to remotely calibrate the sensor. The sensor remote calibration method can solve the problems of complex sensor calibration process, low efficiency and high cost of the existing ambient air quality detection device; the environmental air quality monitoring device has the advantages of convenience in carrying, easiness in calibration, accurate detection result and low cost, and the sensor can be remotely calibrated by the sensor remote calibration method, so that the calibration cost is reduced.

Description

Remote calibration method for sensor for monitoring ambient air and ambient air quality monitoring device
Technical Field
The invention belongs to the field of environmental monitoring, and relates to an environmental air quality monitoring device and a sensor calibration technology thereof, in particular to a remote sensor calibration method for environmental air monitoring and an environmental air quality monitoring device.
Background
With the rapid development of industry and transportation industry, a great amount of atmospheric pollutants are discharged into the air, and the pollution of the atmospheric environment is caused. Meanwhile, with the improvement of the living standard of people, moving tools such as vehicles and the like become one of living and traveling necessities of people, and the environment quality of the current area is PM2.5/PM10 particulate matters and TVOC, CO, SO released by fixed monitoring stations 2 、NO 2 、O 3 、H 2 S and other pollutant data are known.
Most of the existing air quality monitoring is through a fixed monitoring station, and a small amount of portable air quality monitoring devices are also arranged, but in the using process, zero drift problems can occur in the monitoring station or the sensors of the air quality monitoring devices, and the sensors need to be calibrated regularly or irregularly if the accuracy of the environmental air quality monitoring results is required. Currently, for calibration of a sensor of an air quality monitoring device or a monitoring station, the air quality monitoring device needs to be brought to an enterprise or a calibration center with a standard calibration instrument for calibration, the calibration method is that the standard instrument and a mobile device are placed in the same environment, data are collected for a period of time respectively, then the data collected by the mobile device and the data collected by the standard instrument are exported, a sensor calibration formula is fitted through a specific algorithm, and then the sensor calibration formula is written into the air quality monitoring device through specific software. The whole calibration process is complicated, and if the calibration process is not performed by a professional technician, calibration errors can be caused, so that actual use is affected.
Although there are also some monitoring devices currently used for mobile devices, they have several problems in use:
1. the monitoring device is mainly used for measuring single pollutants, if detection of multiple pollutants is to be realized, multiple monitoring channels are required to be arranged, the structure of the monitoring device is complex and large, and the conditions of bending and blocking or damaging of the detection airway and the like are easy to occur, so that the measurement result and the measurement efficiency of the monitoring device are affected.
2. Under rainy environment, because rainwater easily gets into in the detection gas circuit, consequently environment monitoring device can not use in rainy environment for monitoring device's application scope is narrower.
3. Most of monitoring devices directly introduce ambient air into a detection channel for detection, the air flow is not controlled, the air flow in the detection channel is neglected, the detection channel is impacted by air flow due to the large ambient air flow easily in the detection process, and the detection air channel is bent and blocked or damaged; the problem that the ambient air flow is small, so that particulate matters in the ambient air accumulate in the detection channel and the detection channel is blocked; the detection device needs to be constantly overhauled and maintained, and the measurement result and the measurement efficiency of the monitoring device are seriously affected.
Therefore, there is a need to devise a method of calibrating sensors of new air quality monitoring devices while improving upon existing air quality monitoring devices.
Disclosure of Invention
The invention aims to solve the problems of complex sensor calibration process, low efficiency and high cost of the existing ambient air quality detection device, and provides a remote sensor calibration method for ambient air monitoring.
The technical scheme for realizing the aim of the invention is as follows: the remote calibration method of the sensor for monitoring the ambient air comprises the following steps of adopting a server, an ambient air monitoring mobile terminal and an air quality standard monitoring station to remotely calibrate the sensor of an ambient air quality monitoring device:
step 1, an ambient air quality monitoring device collects original data of ambient air pollutants and current position coordinate information;
step 2, operating the ambient air monitoring mobile terminal by a user, and sending a sensor calibration request to a server;
step 3, the server receives a sensor calibration request, and simultaneously, the server receives the original data of the environmental air pollutants and the current position coordinate information sent by the environmental air quality monitoring device;
Step 4, the server inquires an air quality standard monitoring station corresponding to the position of the current position coordinate information, and acquires pollutant standard data corresponding to the sensor in the air quality standard monitoring station;
step 5, the server derives a sensor calibration formula according to the original data of the ambient air and the standard data of pollutants;
step 6, the server sends a sensor calibration formula to the ambient air quality monitoring device, and remotely calibrates a sensor of the ambient air quality monitoring device;
and 7, the environmental air quality monitoring device sends a calibration success feedback instruction to the environmental air monitoring mobile terminal, and calibration of a sensor in the environmental air quality monitoring device is completed.
In one embodiment of the present invention, step 1 includes the steps of:
step 1.1, moving an ambient air quality monitoring device to an air quality standard monitoring station M distance range;
step 1.2, starting up the mobile terminal by using the environmental air quality monitoring device and the environmental air monitoring device to preheat;
and 1.3, detecting and collecting original data of environmental air pollutants by each sensor in the environmental air quality monitoring device, and acquiring current position coordinate information of the environmental air quality monitoring device.
The step 2 comprises the following steps:
step 2.1, a user inputs a device number corresponding to an ambient air quality monitoring device in an ambient air monitoring mobile terminal, and checks the ambient air pollutant original data and the current position coordinate information of the ambient air quality monitoring device;
and 2.2, after K minutes, the user operates in the ambient air monitoring mobile terminal, and a sensor calibration request is sent to the server.
The step 3 comprises the following steps:
step 3.1, a server receives a sensor calibration request sent by the environmental air monitoring mobile terminal in step 2.2;
and 3.2, the server inquires an air quality standard monitoring station corresponding to the current position coordinate information, and pollutant standard data corresponding to the sensor in the air quality standard monitoring station are obtained.
As an improvement to the above-mentioned remote calibration method for the sensor, in step 5, the sensor calibration formula is: y=x '+b, y is a value after calibration of the sensor contaminant of the environmental air quality monitoring device, x' is a value obtained after filtering processing of the raw data of the environmental air contaminant, and b is an intercept.
Wherein x' =x 1 /2+x 2 /3+x 3 First three packages x collected by/6, x' environmental air quality monitoring device 1 、x 2 、x 3 Is a filtered treatment value of the raw data of the environmental air pollutants.
Wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure GDA0004101144520000041
x is the average value of the pollutant concentration of the air quality standard monitoring station in Q minutes, and N is the number of collected data packets.
In the invention, the environmental air quality monitoring device collects environmental air pollutant raw data including TSP pollutant raw data, PM2.5 pollutant raw data, PM10 pollutant raw data, TVOC pollutant raw data, CO pollutant raw data and SO pollutant raw data 2 Contaminant raw data, NO 2 Raw data of pollutant, O 3 Contaminant raw data, H 2 S, one or more of raw data of pollutants and raw data of a temperature-humidity-pressure sensor. The remote calibration method for the ambient air monitoring sensor can conveniently and rapidly calibrate the sensor of the ambient air quality monitoring device with continuous and random change of geographic positions, avoids the ambient air quality monitoring device from being sent to an enterprise or a calibration center with standard calibration instruments for calibration, improves the calibration efficiency of the ambient air quality monitoring device, reduces the calibration cost, avoids the need of purchasing special standard instruments, and saves the calibration cost.
The invention aims to solve the problems that the existing air quality monitoring device is inconvenient to carry, low in accuracy of detection results and narrow in application range, improves the existing air quality monitoring device, and provides an environment air quality monitoring device, wherein a sensor in the environment air quality monitoring device is calibrated by a remote calibration method of the sensor for monitoring the environment air.
The technical scheme for realizing the aim of the invention is as follows: the utility model provides an environment air quality monitoring device of environment air monitoring, includes casing and is located the air quality monitoring system of casing, is equipped with the sensor in the air quality monitoring system, and environment air quality monitoring device is applied to above-mentioned sensor remote calibration method and carries out remote calibration to the sensor.
Wherein, be equipped with control unit in the air quality monitoring system, control unit includes the main circuit board, is equipped with positioning module and communication module on the main circuit board, positioning module and communication module electricity are connected. The positioning module is used for positioning the environmental air quality monitoring device in real time and sending the current position coordinate information of the environmental air quality monitoring device to the environmental air monitoring mobile terminal through the communication module. The communication module is also in bidirectional electrical connection with each sensor in the ambient air quality monitoring device, and is used for receiving ambient air pollutant raw data of the sensor and sending the ambient air pollutant raw data to the ambient air monitoring mobile terminal, and the communication module is also used for receiving sensor pollutant calibration data sent by the ambient air monitoring mobile terminal and sending the sensor pollutant calibration data to the sensor for remote calibration of the sensor.
According to the invention, the geographic position of the environmental air quality monitoring device can be positioned in real time through the arrangement of the communication module and the positioning module, the current position coordinate information of the environmental air quality monitoring device is sent into the environmental air monitoring mobile terminal through the communication module, the environmental air monitoring mobile terminal sends a calibration request, and the remote calibration of each sensor of the environmental air quality monitoring device is realized through the server.
The working process and working principle of the control unit are as follows: the method comprises the steps that a sensor in an air quality monitoring system in the ambient air quality monitoring device detects ambient air pollutant raw data, the detected ambient air pollutant raw data are transmitted into a communication module, and the communication module sends the detected ambient air pollutant raw data into a server or an ambient air monitoring mobile terminal; the positioning module detects the current position coordinate information of the environmental air quality monitoring device in real time, and sends the current position coordinate information to the server or the environmental air monitoring mobile terminal through the communication module; the method comprises the steps that an ambient air monitoring mobile terminal sends a calibration request to a server, the server inquires and invokes pollutant standard data of an air quality standard monitoring station, the pollutant standard data and ambient air pollutant raw data measured by an ambient air quality monitoring device obtained by the server are analyzed, a calibration formula is generated, and the server sends the calibration formula to the ambient air quality monitoring device, so that remote calibration of each sensor of the ambient air quality monitoring device is achieved.
As an improvement to the above air detection system, the air quality monitoring system further includes an air detection air path, and in the present invention, according to different environmental air quality monitoring devices, the design of the air detection air path is different, and the design of the air detection air path is as follows:
in the first design of the air detection air circuit, 1 air detection air circuit is arranged on the air quality monitoring system, a particulate matter sensor structure is arranged on the air detection air circuit, and the particulate matter sensor structure comprises a plurality of particulate matter sensors, wherein the particulate matter sensors are used for detecting the concentration of particulate matters in ambient air. When the environmental air quality monitoring device works, the environmental air enters the air detection air path, is detected by the particulate matter sensor, and is discharged through the air detection air path.
As an improvement of the air detection air circuit of the first design, an ambient air output end of the particulate matter sensor structure is connected with a gas sensor structure and a gas flow control structure through a pipeline. The gas sensor structure is used to detect the concentration of contaminant gases within the ambient air. The gas flow control structure is used for introducing ambient air into the gas sensor structure and filtering and controlling the flow of the ambient air entering the gas sensor structure.
When the environmental air quality monitoring device works, the environmental air enters the air detection air path and is discharged through the air detection air path after being sequentially detected by the particulate matter sensor structure, the gas flow control structure and the gas sensor structure.
In a second design of the air detection air circuit, 2 air detection air circuits are arranged on the air quality monitoring system, wherein 1 air detection air circuit is a particulate matter detection air circuit, and the other air detection air circuit is a gas detection air circuit.
Specifically, the particulate matter detection gas circuit comprises a particulate matter sensor structure and a vacuum pump. When the environmental air quality monitoring device works, the vacuum pump sucks the environmental air into the particulate matter detection air path, and the environmental air is discharged through the particulate matter detection air path after being detected by the particulate matter sensor structure;
specifically, the gas detection gas circuit comprises a gas flow control structure and a gas sensor structure, wherein the gas flow control structure is used for introducing ambient air into the gas detection gas circuit and filtering and controlling the flow of the ambient air entering the gas sensor structure. The gas sensor structure is used for measuring the concentration of each gas in the ambient air.
When the ambient air quality monitoring device works, the air flow control structure sucks ambient air into the air detection air circuit, the ambient air is filtered and flow is controlled through the air flow control structure in sequence, and the ambient air is detected through the air sensor structure and finally discharged through the air detection air circuit.
In a third design of the air detection circuit, 2 air detection circuits are provided on the air quality monitoring system.
The 1 st air detection air path is a particle detection air path, and the particle detection air path comprises a particle sensor structure and a vacuum pump.
When the environmental air quality monitoring device works, the vacuum pump sucks the environmental air into the particulate matter detection air path, and the environmental air is discharged through the particulate matter detection air path after being detected by the particulate matter sensor structure.
The environment air output end of the particulate matter sensor structure of the particulate matter detection air circuit is connected with the air detection air circuit through a pipeline, and the air detection air circuit comprises an air flow control structure and an air sensor structure. The gas detection gas circuit is communicated with the particle sensor structure to form a gas comprehensive detection gas circuit, and the gas flow control structure is used for introducing ambient air into the gas comprehensive detection gas circuit and filtering and controlling the flow of the ambient air entering the gas sensor structure. The gas sensor structure is used for measuring the concentration of each gas in the ambient air.
When the environmental air quality monitoring device works, the air flow control structure sucks the environmental air into the air comprehensive detection air path, the environmental air is detected by the particulate matter sensor structure, the flow is filtered and controlled by the air flow control structure, the air is detected by the air sensor structure, and finally the air is discharged by the air detection air path.
Above-mentioned 3 air detection gas circuit's design can simplify the structure of environmental air quality monitoring device, makes the setting of in-device detection pipeline succinct more, makes things convenient for the maintenance of each module in the air detection gas circuit in installation and the later stage device of device.
Further, as an improvement to the gas sensor structure of the air detection gas circuit, the gas sensor structure comprises a gas sensor layer and a ventilation cover, and the gas sensor layer is fixedly arranged on the ventilation cover through a fixing component.
The two ends of the ventilation cover are provided with air passage connectors, the upper surface of the ventilation cover is provided with at least 2 grooves, the air passage connectors are communicated with the grooves and the adjacent grooves through air passage pipelines in the ventilation cover, and the air passage connectors, the air passage pipelines and the grooves are communicated to form a detection air passage for ambient air.
The gas sensor layer comprises a plurality of gas sensors, the gas sensors are mounted on the grooves, a detection cavity is formed between the lower surfaces of the gas sensors and the bottoms of the grooves, the gas sensors are used for detecting the concentration of pollutant gas in the ambient air in the detection gas path, and the modularized mounting of the gas sensors is realized by mounting not less than 2 gas sensors on the ventilation cover, so that the mounting and dismounting efficiency of the gas sensor structure is improved.
In one embodiment of the invention, the gas sensor layer includes at least 2 gas sensors, and each gas sensor is individually mounted and secured to the ventilation hood via a securing assembly. Through with 2 at least gas sensor alone and set gradually on the ventilation hood, can in time discover gas sensor's trouble, carry out quick accurate dismantlement, promoted efficiency greatly, simultaneously, avoid causing the influence to other gas sensors.
Or the gas sensor layer comprises at least 2 gas sensors, and the at least 2 gas sensors are integrated together and mounted and fixed on the ventilation hood via a fixing component. By forming at least 2 gas sensors into an integral gas sensor layer and then mounting the gas sensor layer on the ventilation cover, the modularized mounting of the gas sensors is realized, and the mounting and dismounting efficiency of the gas sensor structure is improved.
Compared with the prior art, the invention has the beneficial effects that:
1. the remote calibration method for the ambient air monitoring sensor can conveniently and rapidly calibrate the sensor of the ambient air quality monitoring device with continuous and random change of geographic positions, avoids the ambient air quality monitoring device from being sent to an enterprise or a calibration center with standard calibration instruments for calibration, improves the calibration efficiency of the ambient air quality monitoring device, and reduces the calibration cost.
2. The remote calibration method for the sensor for monitoring the ambient air is used, so that the need of purchasing a special standard instrument is avoided, and the calibration cost is saved.
3. The environmental air quality monitoring device is designed, and through the arrangement of the communication module and the positioning module on the main circuit board in the control unit, the environmental air of the mobile equipment in different geographic positions can be monitored in real time, the remote calibration of the sensor can be realized, the accuracy of the detection result is ensured, and the detection precision is improved.
4. Through setting up gas flow control structure on the air detection gas circuit, the air detection gas circuit that can realize is flow closed loop control for the ambient air flow in the air detection gas circuit is more accurate and stable, can diagnose the state of the air current and the air pump of ambient air on the air detection gas circuit according to the testing result of gas flowmeter module simultaneously, has ensured detection device's operation safety and equipment security. And the air pump in the gas flow control structure is arranged, so that the ambient air enters the detection pipeline in a pumping mode, the stability of the air flow and the accuracy of sampling are ensured, and the accuracy of a monitoring result is improved.
5. Through the setting of air detection gas circuit and each detection module thereof, can simplify the structure of ambient air quality monitoring device, make the setting of the detection pipeline in the device succinct more, make things convenient for the maintenance of each module in the installation and the later stage device of device.
6. Through the different designs of the gas sensor structure, the gas sensor is suitable for the environmental air quality monitoring devices with different structures. And through the setting to the ventilation hood of gas sensor structure, can ensure that ambient air can be stable and mild get into gas sensor, ensure the accuracy of gas sensor testing result, simultaneously, through designing ventilation hood and gas sensor junction, can avoid ambient air to reveal from ventilation hood and gas sensor junction.
7. Through the design of the air inlet structure, the environmental air quality monitoring device can be selectively provided with the rain cover structure according to different scenes such as the inside and the outside of the automobile, so that the environmental air quality monitoring device can be applied in the automobile, the outside of the automobile and in rainy days, and the application range of the environmental air quality monitoring device is improved.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described. It is apparent that the drawings in the following description are only for the purpose of more clearly illustrating the embodiments of the present invention or the technical solutions in the prior art, and that other drawings can be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic diagram of remote calibration of a sensor of an ambient air quality monitoring device of the present invention;
FIG. 2 is a schematic view of an environmental air quality monitoring device according to the present invention;
FIG. 3 is a schematic view of an environmental air quality monitoring device according to the present invention;
FIG. 4 is a schematic view of an environmental air quality monitoring device according to the present invention;
FIG. 5 is a schematic view of an environmental air quality monitoring device according to the present invention;
FIG. 6 is a schematic view of an environmental air quality monitoring device according to the present invention;
FIG. 7 is a schematic view of an environmental air quality monitoring device according to the present invention;
FIG. 8 is a functional block diagram of a control unit in the ambient air quality monitoring device of FIGS. 2-8 of the present invention;
FIG. 9 is a perspective view of the gas sensor of FIG. 2 of the present invention;
FIG. 10 is a schematic cross-sectional view of a vent cover of the gas sensor of FIG. 2 in accordance with the invention;
FIG. 11 is a perspective view of the gas sensor of FIGS. 3-7 in accordance with the present invention;
FIG. 12 is a schematic cross-sectional view of a vent cover of the gas sensor of FIGS. 3-7 in accordance with the invention;
FIG. 13 is a schematic view of the flow of air in the vent pipe of the gas sensor of FIGS. 3-7 in accordance with the present invention;
FIG. 14 is a schematic block diagram of a gas flow control structure of the present invention;
FIG. 15 is a perspective view of a filter construction of the present invention;
FIG. 16 is a perspective view of an air intake structure of the present invention;
1, a shell; 2. an air intake structure; 2-1. a main valve of the air inlet valve; 2-4. a through hole; 2-5. an air inlet joint; 2-6. a rain cover structure; 3. a gas flow meter module; 4. an air pump; 5. an exhaust valve; 7. a particulate matter sensor structure; 8. a gas sensor structure; 9. a temperature-humidity-pressure sensor; 10. a filter structure; 10-1. a first filter; 10-2. a filter holder; 10-3. a second filter; 11. a battery; 12. a switch; 13. an external power interface; 14. an indicator light; 15. a bottom plate; 16. a main circuit board; 16-1. a main circuit board bracket; 17. a display screen circuit board; 801. a gas sensor layer; 100. a groove; 101. a first cylindrical recess; 102. a second cylindrical recess; 200. an air path pipeline; 300. a hole; 802. a fixing assembly; 8021. a sensor gland; 8022. a sensor post; 8023. a screw; 803. an air-permeable cover; 804. and a sealing gasket.
Detailed Description
The invention will be further described with reference to specific embodiments, and advantages and features of the invention will become apparent from the description. These examples are merely exemplary and do not limit the scope of the invention in any way. It will be understood by those skilled in the art that various changes and substitutions of details and forms of the technical solution of the present invention may be made without departing from the spirit and scope of the present invention, but these changes and substitutions fall within the scope of the present invention.
In the description of the present embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
Example 1:
in this embodiment, as shown in fig. 1, the remote calibration method of the sensor for monitoring ambient air uses a server, an ambient air monitoring mobile terminal, and an air quality standard monitoring station to remotely calibrate the sensor of the ambient air quality monitoring device, and specifically includes the following steps:
Step 1, an ambient air quality monitoring device collects original data of ambient air pollutants and current position coordinate information;
step 2, operating the ambient air monitoring mobile terminal by a user, and sending a sensor calibration request to a server;
step 3, the server receives a sensor calibration request, and simultaneously, the server receives the original data of the environmental air pollutants and the current position coordinate information sent by the environmental air quality monitoring device;
step 4, the server inquires an air quality standard monitoring station corresponding to the position of the current position coordinate information, and acquires pollutant standard data corresponding to the sensor in the air quality standard monitoring station;
step 5, the server derives a sensor calibration formula according to the original data of the ambient air and the standard data of pollutants;
step 6, the server sends a sensor calibration formula to the ambient air quality monitoring device, and remotely calibrates a sensor of the ambient air quality monitoring device;
and 7, the environmental air quality monitoring device sends a calibration success feedback instruction to the environmental air monitoring mobile terminal, and calibration of a sensor in the environmental air quality monitoring device is completed.
Example 2:
the present embodiment provides another remote calibration method for the sensor for ambient air monitoring, which is further optimized based on the remote calibration method for the sensor of embodiment 1. In this embodiment, as shown in fig. 1, the method for remotely calibrating the sensor of the environmental air quality monitoring device by using a server, an environmental air monitoring mobile terminal, and an air quality standard monitoring station specifically includes the following steps:
Step 1.1, moving an ambient air quality monitoring device to an air quality standard monitoring station M distance range; in the step, when the machine is started, the preheating time is 15min, and generally, when the preheating time reaches 15min, the equipment enters a stable state; in the step, in order to ensure the accuracy of a remote calibration result of a sensor of the ambient air quality monitoring device, the ambient air quality monitoring device is generally selected to be moved to a range of M less than or equal to 50km taking an air quality standard monitoring site as a center for calibration;
step 1.2, starting up the mobile terminal by using the environmental air quality monitoring device and the environmental air monitoring device to preheat;
step 1.3, detecting and collecting original data of environmental air pollutants by each sensor in the environmental air quality monitoring device, and obtaining current position coordinate information of the environmental air quality monitoring device, wherein the step 1.1 is to move the environmental air quality monitoring device to an M distance range centering on an air quality standard monitoring station; in the step, the calibration of each sensor in the environmental air quality monitoring device is carried out after the environmental air quality monitoring device is stable for 15min, and the raw data of the environmental air pollutants at each time point in a certain time range are generally collected, and the average value is taken to obtain the raw data of the environmental air pollutants;
Step 2.1, a user inputs a device number corresponding to an ambient air quality monitoring device in an ambient air monitoring mobile terminal, and checks the ambient air pollutant original data and the current position coordinate information of the ambient air quality monitoring device;
and 2.2, after K minutes, the user operates in the ambient air monitoring mobile terminal, and a sensor calibration request is sent to the server. In the step, the calibration of each sensor in the environmental air quality monitoring device is carried out after the environmental air quality monitoring device is stable for 15min, and the raw data of the environmental air pollutants at each time point in a certain time range are generally collected, and the average value is taken to obtain the raw data of the environmental air pollutants;
step 3.1, a server receives a sensor calibration request sent by the environmental air monitoring mobile terminal in step 2.2;
and 3.2, the server inquires an air quality standard monitoring station corresponding to the current position coordinate information, and pollutant standard data corresponding to the sensor in the air quality standard monitoring station are obtained.
Step 4, the server inquires an air quality standard monitoring station corresponding to the position of the current position coordinate information, and acquires pollutant standard data corresponding to the sensor in the air quality standard monitoring station;
Step 5, the server derives a sensor calibration formula according to the original data of the ambient air and the standard data of pollutants;
step 6, the server sends a sensor calibration formula to the ambient air quality monitoring device, and remotely calibrates a sensor of the ambient air quality monitoring device;
and 7, the environmental air quality monitoring device sends a calibration success feedback instruction to the environmental air monitoring mobile terminal, and calibration of a sensor in the environmental air quality monitoring device is completed.
Embodiment 1 and the sensor remote calibration method of the present embodiment enable simultaneous calibration of one or more sensors in an ambient air quality monitoring device, including TSP sensor, PM2.5 sensor, PM10 sensor, TVOC sensor, CO sensor, SO 2 Sensor, NO 2 Sensor, O 3 Sensor, H 2 And one or more of the S sensor and the temperature-humidity-pressure sensor are calibrated remotely at the same time.
In embodiment 1 and step 5 of the present embodiment, the sensor calibration formula is: y=x '+b, y is a value obtained by calibrating sensor pollutants of the environmental air quality monitoring device, x' is a value obtained by filtering raw data of the environmental air pollutants, and b is an intercept.
Wherein x' =x 1 /2+x 2 /3+x 3 First three packages x collected by/6, x' environmental air quality monitoring device 1 、x 2 、x 3 (in example 1 and this example, x is as follows 1 Defined as the most recent package) of raw data of ambient air pollutants.
Wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure GDA0004101144520000131
x is the average value of the pollutant concentration of the air quality standard monitoring station in Q minutes (generally 15 minutes), N is the number of collected data packets, and in embodiment 1 and this embodiment, N generally takes a value of 30, namely the data of the first 30 packets collected by the sensor of the environmental air quality monitoring device received by the server.
In embodiment 1 and this embodiment, the raw data of the environmental air pollutants collected by each sensor of the environmental air quality monitoring device is uploaded to the server and calibrated by the calibration formula.
In embodiment 1 and this embodiment, if the difference between the original data of the environmental air contaminant calibrated by the sensor remote calibration method and the data obtained after the calibration is large, the calibration may be performed again automatically or manually.
It should be noted that, if the pollutant standard data of the located air quality standard monitoring station is abnormal, an alternative scheme may be selected, such as using an air quality standard monitoring station that is relatively close to the air quality standard monitoring station, using pollutant standard data of the air quality standard monitoring station for the previous hour, or using an average value of pollutant standard data of the city where the current location is located.
It should be noted here that if there is no air quality standard monitoring site near where the ambient air quality monitoring device is located, the data of the micro-meshing device may be used to remotely calibrate one or more sensors simultaneously.
It should be noted that, if there is no air quality standard monitoring station near the location where the ambient air quality monitoring device is located, it is possible to consider that other data such as satellite inversion concentration is used to remotely calibrate one or more sensors simultaneously.
Example 3:
in this embodiment, as shown in fig. 2 to 7, the environmental air quality monitoring devices each include a housing 1 and an air quality monitoring system located in the housing 1, in which a sensor is disposed, and the sensor in the environmental air quality monitoring device is calibrated by the remote calibration method of the environmental air monitoring sensor in embodiment 1 and embodiment 2.
The air quality monitoring system is internally provided with a control unit, and the control unit is used for realizing remote calibration of each sensor in the environmental air quality monitoring device and collection and transportation of detection data of each sensor.
Wherein, be equipped with the air detection gas circuit in the air quality monitoring system, the ambient air is in the air detection gas circuit through the inlet structure 2 that is located on the casing 1, after each detection module detects in the air detection gas circuit, discharges through discharge valve 5 on the casing 1 again.
Example 4:
in this embodiment, the control unit in embodiment 3 is explained in detail, and as shown in fig. 2, 3, 4 and 5, the control unit includes a main circuit board 16 (i.e. PCB board), the main circuit board 16 is fixed in the housing 1 via a main circuit board bracket 16-1, and the main circuit board bracket 16-1 is made of an aluminum alloy material. The main circuit board 16 is not shown in the ambient air quality monitoring devices of fig. 6 and 7.
As shown in fig. 8, the main circuit board 16 is provided with a positioning module and a communication module, and the positioning module is electrically connected with the communication module. The positioning module is used for positioning the environmental air quality monitoring device in real time and sending the current position coordinate information of the environmental air quality monitoring device to the server through the communication module. The communication module is also in bidirectional electrical connection with each sensor in the ambient air quality monitoring device, and is used for receiving the ambient air pollutant raw data of each sensor and sending the ambient air pollutant raw data to the server, and the communication module is also used for receiving a sensor pollutant calibration formula sent by the server and sending the sensor pollutant calibration formula to each sensor for remote calibration of each sensor.
In this embodiment, as an improvement of the control unit, an antenna is further provided on the housing 1, and the antenna is electrically connected with the communication module, and is used for assisting the positioning module to obtain the current position coordinate information of the environmental air quality monitoring device, and is further used for assisting the communication module to send the original data of the environmental air pollutants and the current position coordinate information to the server, and is further used for assisting the communication module to receive the calibration formulas of the sensors sent by the server.
In the embodiment, the communication module selects 4G/3G/2G, and the pollutant data detected by the sensor is transmitted to the server through the communication module and the antenna; the antenna is preferably a GPS+4G/3G/2G antenna.
In this embodiment, the positioning module is preferably a GNSS positioning module, which can implement positioning of the ambient air quality monitoring device and the air quality standard monitoring station based on GPS and beidou positioning. The server reads the pollutant standard data of the inquired air quality standard monitoring station, so that the remote calibration of the sensor is realized. Through setting up of positioning module, can realize the remote calibration to each sensor of ambient air quality monitoring device, avoid purchasing the calibration instrument or to have in the structure of calibration instrument to ambient air quality monitoring device carry out remote calibration, improve ambient air quality monitoring device calibration's convenience and efficiency, reduced the calibration cost.
As an improvement on the control unit, as shown in fig. 8, the main circuit board 16 is further provided with a bluetooth module, which is electrically connected with the detection module, and the bluetooth module is used for sending the original data of the environmental air pollutants of the sensor to the environmental air monitoring mobile terminal, such as a mobile phone, a tablet computer, etc., so as to facilitate personnel to check various data information in time through the environmental air monitoring mobile terminal. For example, when the ambient air monitoring mobile terminal is a mobile phone, the Bluetooth module uploads various pollutant data detected by the detection module and air flow data detected by the air flow meter module to the APP of the mobile phone, so that personnel can conveniently check various data information in real time.
As an improvement of the control unit, as shown in fig. 8, a storage module is disposed on the main circuit board 16, an input end of the storage module is electrically connected with the detection module, an output end of the storage module is electrically connected with the communication module and the bluetooth module, and the storage module is used for buffering various monitoring data sent from the detection module to the communication module and the bluetooth module.
As shown in fig. 8, the main circuit board 16 is further provided with a power module, specifically, an output end of the power module is electrically connected with the battery 11 located in the housing 1, and the battery 11 is preferably a rechargeable lithium battery, which has light weight and low density and is suitable for various mobile devices. The battery 11 supplies power to the device, ensuring its proper operation.
Preferably, as shown in fig. 2 to 7, the input end of the power module is also electrically connected with an external power interface 13 on the housing 1, so as to charge the battery 11 through the power module by an external direct current power supply or a vehicle-mounted cigar lighter; at the same time, the battery 11 is also electrically connected with a switch 12 on the shell 1, and the switch 12 controls the starting and closing of the device.
As an improvement on the control unit, as shown in fig. 8, the control unit further includes a display screen circuit board, an input end of the display screen circuit board is electrically connected with the communication module, the positioning module and the battery 11, an output end of the display screen circuit board 17 is electrically connected with the display screen, and the display screen circuit board 17 and the display screen are arranged, so that a user can review various pollution index values of the ambient air in the mobile device and the electric quantity of the battery 11 at any time, so that corresponding treatment measures can be taken in time to improve the quality of the air environment in the vehicle.
In order to facilitate the display of timely finding the abnormal condition of the operation of the environmental air quality monitoring device, as shown in fig. 2 to 7, an indicator lamp 14 is further disposed on the housing 1, where the indicator lamp 14 at least includes a power indicator lamp, a detection module indicator lamp, and a communication module indicator lamp. Specifically, as shown in fig. 8, the power indicator, the detection module indicator and the communication module indicator are all connected with the indicator circuit board, wherein the power indicator indicates whether the device works normally or not; the communication module indicator light indicates whether the communication module works normally or not; the detection module indicator light indicates whether the detection module works normally or not.
According to the invention, the geographic position of the environmental air quality monitoring device can be positioned in real time through the arrangement of the communication module and the positioning module, the current position coordinate information of the environmental air quality monitoring device is sent into the environmental air monitoring mobile terminal through the communication module, the environmental air monitoring mobile terminal sends a calibration request, and the remote calibration of each sensor of the environmental air quality monitoring device is realized through the server.
The working principle of the control unit is as follows: the detection module on the air detection air path detects each environmental air pollutant raw data of the environmental air, the main circuit board 16 receives and transmits the detected environmental air pollutant raw data into the communication module, and the communication module sends the detected environmental air pollutant raw data into the server or the environmental air monitoring mobile terminal; the positioning module detects the current position coordinate information of the environmental air quality monitoring device in real time and sends the current position coordinate information to the environmental air monitoring mobile terminal or the server through the communication module; the method comprises the steps that an ambient air monitoring mobile terminal sends a calibration request to a server, the server calls pollutant standard data and ambient air pollutant original data of an air quality standard monitoring station, analyzes the pollutant standard data and the ambient air pollutant original data and generates a calibration formula, and the server sends the calibration formula to an ambient air quality monitoring device to realize remote calibration of each sensor of the ambient air quality monitoring device.
Example 5:
the present embodiment is a detailed explanation of the air detection circuit in embodiment 3, which is the first design of the air detection circuit.
As shown in fig. 12, the air quality monitoring device is provided with 1 air detection air path on the air quality monitoring system, the air detection air path is provided with a particulate matter sensor structure 7, and the particulate matter sensor structure 7 comprises a plurality of particulate matter sensors for detecting the concentration of particulate matters in the ambient air. When the environmental air quality monitoring device works, the environmental air enters the air detection air path, is detected by the particulate matter sensor structure 7, and is discharged through the air detection air path.
As an improvement on the air detection air path, an environmental air quality monitoring device is shown in fig. 2, 3 and 11. The air detection air path is provided with a particle sensor structure 7, and the particle sensor structure 7 comprises a plurality of particle sensors, wherein the particle sensors are used for detecting the concentration of particles in the ambient air. The ambient air output end of the particulate matter sensor structure 7 is connected with a gas sensor structure 8 and a gas flow control structure through a pipeline. The gas sensor structure 8 is used to detect the concentration of contaminant gases within the ambient air. The gas flow control structure is used to introduce ambient air into the gas sensor structure 8 and to filter and flow control the ambient air entering the gas sensor structure 8.
When the environmental air quality monitoring device works, the environmental air enters the air detection air path and is sequentially detected by the particle sensor of the particle sensor structure 7, and is discharged through the air detection air path after being detected by the gas flow control structure and the gas sensor structure 8.
Example 6:
the air detection circuit of embodiment 3 is explained in detail, and the second design of the air detection circuit is described in this embodiment.
As shown in fig. 5, the air quality monitoring system is provided with 2 air detection air paths, wherein 1 air path is a particulate matter detection air path, and the other air path is a gas detection air path.
Specifically, the particulate matter detecting air path includes a particulate matter sensor structure 7 and a vacuum pump (not shown in the drawings). When the environmental air quality monitoring device works, the vacuum pump sucks the environmental air into the particulate matter detection air path, and the environmental air is discharged through the particulate matter detection air path after being detected by the particulate matter sensor structure 7;
specifically, the gas detection gas circuit comprises a gas flow control structure and a gas sensor structure 8, wherein the gas flow control structure is used for introducing ambient air into the gas detection gas circuit and filtering and controlling the flow of the ambient air entering the gas sensor structure 8. The gas sensor structure 8 is used to determine the concentration of each gas in the ambient air.
When the ambient air quality monitoring device works, the air flow control structure sucks ambient air into the air detection air circuit, the ambient air is filtered and flow is controlled through the air flow control structure in sequence, and the ambient air is detected through the air sensor structure 8 and finally discharged through the air detection air circuit.
Example 7:
the air detection circuit of embodiment 3 is explained in detail, and the third design of the air detection circuit is described in this embodiment.
The air quality monitoring system of the environmental air quality monitoring device shown in fig. 4 is provided with 2 air detection air paths.
The 1 st air detection air path is a particulate matter detection air path, and the particulate matter detection air path comprises a particulate matter sensor structure 7 and a vacuum pump (not shown in the drawing). When the environmental air quality monitoring device works, the vacuum pump sucks the environmental air into the particulate matter detection air path, and the environmental air is discharged through the particulate matter detection air path after being detected by the particulate matter sensor structure 7.
The ambient air output end of the particulate matter sensor structure 7 of the particulate matter detection air circuit is connected with a gas detection air circuit through a pipeline, and the gas detection air circuit comprises a gas flow control structure and a gas sensor structure 8.
Specifically, the gas detection gas circuit is communicated with the particulate matter sensor structure 7 to form a gas comprehensive detection gas circuit, the gas detection gas circuit is communicated with the particulate matter sensor structure to form a gas comprehensive detection gas circuit, and the gas flow control structure is used for introducing ambient air into the gas comprehensive detection gas circuit and filtering and controlling the flow of the ambient air entering the gas sensor structure 8. The gas sensor structure 8 is used to determine the concentration of each gas in the ambient air.
When the environmental air quality monitoring device works, the air flow control structure sucks the environmental air into the air comprehensive detection air path, the environmental air is detected by the particulate matter sensor structure 7, the flow is filtered and controlled by the air flow control structure, the air is detected by the air sensor structure 8, and finally the air is discharged by the air detection air path.
In the above embodiments 5 to 7, the structures of the particulate matter sensor structures 7 of the respective environmental air quality monitoring devices are the same, and the particulate matter sensor structures 7 are used for detecting the concentration of particulate matters such as PM2.5 and PM10, and include a plurality of particulate matter sensors. In the present embodiment, the particulate matter sensor structure 7 includes a PM2.5 sensor, a PM10 sensor, a TSP sensor, the PM2.5 sensor being for monitoring the concentration of PM2.5 in the ambient air; the PM10 sensor is used to monitor the concentration of PM10 in the ambient air and the TSP sensor is used to monitor the concentration of TSP (TSP, i.e., total suspended particulates, also known as total suspended particulate matter) in the ambient air. When the environmental air quality monitoring device works, the environmental air enters the air detection air path, is detected by the particulate matter sensor structure, and is discharged by the air detection air path.
In the above embodiments 5 to 7, the gas sensor structure 8 and the particulate matter sensor structure 7 of the environmental air quality monitoring device of fig. 2 to 5 are detachably fixed on the base plate 15 via the bracket, respectively; the particulate matter sensor structure 7 of the environmental air quality monitoring device shown in fig. 6 is detachably fixed on the inner wall of the upper shell of the shell 1 through a bracket, and the gas sensor structures 8 are all detachably fixed on the bottom plate 15 through brackets; the particulate matter sensor structure 7 of the ambient air quality monitoring device of fig. 7 is disposed on a particulate matter sensor structure rivet, which is fixed on the inner wall of the end cover via a cross-slot pan head screw and a double-sided tooth lock washer.
The particulate matter sensor structure 7 and the gas sensor structure 8 of the environmental air quality monitoring device detect electrochemical signals of various pollutant gases in the environmental air, convert the detected electrochemical signals of various pollutant concentrations into electrical signals, calculate the concentration of the pollutant gases, and send the concentration of the pollutant gases to the environmental air monitoring mobile terminal or the server through the communication module or the Bluetooth module.
Example 8:
in this embodiment, the gas sensor structure 8 of embodiments 5 to 7 is explained, and as shown in fig. 9 to 13, the gas sensor structure 8 includes a gas sensor layer 801 and a ventilation cover 803, and the gas sensor layer 801 is mounted and fixed on the ventilation cover 803 by a fixing member 802. The gas sensor layer 801 includes TVOC gas sensor, SO 2 Gas sensor, O 3 Gas sensor, NO 2 Gas sensor, CO gas sensor. The TVOC gas sensor is used for measuring the concentration of TVOC (total volatile organic compounds, which means organic compounds with saturated vapor pressure exceeding 133.32pa at room temperature, the boiling point of which is 50-250 ℃ and which can be evaporated in the air at normal temperature) in the ambient air; SO (SO) 2 The gas sensor is used for measuring SO in the ambient air 2 Is a concentration of (2); o (O) 3 Gas sensor for measuring O in ambient air 3 Is a concentration of (2); NO (NO) 2 Gas sensor for measuring NO in ambient air 2 Is a concentration of (2); CO gas sensor for measuring ambient airConcentration of the internal CO gas sensor; for determining the concentration of CO in ambient air.
In embodiments 5 to 7, in the gas sensor structure 8 of the ambient air quality monitoring device, the gas sensor structure 8 includes the gas sensor layer 801 and the ventilation hood 803, the gas sensor layer 801 is mounted and fixed on the ventilation hood 803 through the fixing component 802, and the gas sensor layer 801 includes at least 2 gas sensors sequentially arranged;
wherein at least 2 gas sensors can be individually fixed on the ventilation hood 803 through the fixing component 802, such as the ambient air quality monitoring device shown in fig. 2, and the structure of the gas sensor structure 8 in fig. 2 is shown in fig. 9 and 10.
Wherein at least 2 gas sensors may also be formed as a whole and then fixed on the ventilation hood 803 by the fixing component 802, such as the ambient air quality monitoring device shown in fig. 3 to 7, and the structure of the gas sensor structure 8 shown in fig. 3 to 7 is shown in fig. 11 to 13.
As shown in fig. 10, 12 and 13, gas circuit connectors are disposed at both ends of the ventilation cover 803, and at least 2 grooves 100 are machined on the upper surface of the ventilation cover 803. The air passage joints are communicated with the grooves 100 and the adjacent grooves 100 through the air passage pipelines 200 positioned in the ventilation hoods 803, and the air passage joints, the air passage pipelines 200 and the grooves 100 are communicated to form detection air passages of ambient air. The gas sensor layer comprises at least 2 gas sensors which are sequentially arranged, the gas sensors are arranged on the grooves 100, detection cavities are formed between the lower surfaces of the gas sensors and the bottoms of the grooves 100, and the gas sensors are used for detecting the concentration of pollutant gas in the air in the environment in the gas path.
In this embodiment, the ventilation cover 803 and the gas sensor are improved in the following manner, as shown in fig. 10, 12 and 13, the groove 100 of the gas sensor structure is a cylindrical groove, the gas sensor is a cylindrical gas sensor, and a detection cavity formed between the lower surface of the cylindrical gas sensor and the bottom of the cylindrical groove is a cylindrical detection cavity, and the accuracy of detecting the concentration of the contaminant gas can be ensured by setting the cylindrical detection cavity.
As an improvement of the cylindrical groove, as shown in fig. 10, 12 and 13, the cylindrical groove comprises a first cylindrical groove 101, a group of symmetrical holes 300 are formed on the inner wall of the first cylindrical groove 101, the holes 300 are communicated with the air channel 200, and the centers of the air channel 200, the holes 300 and the first cylindrical groove 101 are all on the same horizontal line. The lower part of the cylindrical gas sensor is of a boss structure, a boss at the lower part of the cylindrical gas sensor is inserted into the first cylindrical groove 101, and a cylindrical detection cavity is formed by enclosing between the bottom wall of the first cylindrical groove 101, the lower surface of the boss of the gas sensor and the peripheral wall of the first cylindrical groove 101. By the arrangement of the structure, on one hand, the path of a detection gas path can be shortened, and the detection efficiency is improved; on the other hand, the detected gas entering the first cylindrical groove 101 can be uniformly distributed in the detection cavity, and the accuracy of detecting the concentration of the pollutant gas can be further improved.
As an improvement of the above cylindrical groove, as shown in fig. 10, 12 and 13, a second cylindrical groove 102 coaxial with the first cylindrical groove 101 is machined on the outer periphery of the first cylindrical groove 101, and a sealing gasket 804 is sleeved on the outer periphery of the boss of the cylindrical gas sensor. When the cylindrical gas sensor is mounted in the first cylindrical recess 101, the sealing gasket 804 is in close contact with the outer wall and the bottom wall of the second cylindrical recess 102. When the gas sensor is arranged in the groove 100 of the ventilation cover 803, the sealing gasket 804 seals the contact part of the gas sensor, so that the tightness is improved, the influence of the gas sensor on the tightness of the mounting position of the groove 100 in the process of detecting the impact of gas in a cavity or the movement of a monitoring system is avoided, the occurrence of gas leakage phenomenon is avoided, and the detection result is influenced.
In the gas sensor structure 8 of each of the above-described environmental air quality monitoring devices, the respective grooves 100 on the ventilation hood 803 shown in fig. 9 are arranged on the same horizontal line, so that the structure of the long-strip-type gas sensor structure 8 is formed.
In the gas sensor structure 8 of each of the above-described environmental air quality monitoring devices, as shown in fig. 11, each of the grooves 100 on the ventilation hood 803 is provided on a different horizontal line, and at least 1 groove 100 is provided on each horizontal line to form the gas sensor structure 8 of the 3+2 structure shown in fig. 11, however, it is needless to say that the gas sensor structures 8 of various structures such as 2+2, 3+4, 1+2 may be formed according to the number of the gas sensors.
As an improvement on the gas path joints of the ventilation hood 803 in fig. 9 and 11, as shown in fig. 13, at least 2 gas path joints are respectively arranged at two ends of the ventilation hood 803, wherein the gas path joint at one end of the ventilation hood 803 comprises a gas inlet joint and a gas outlet joint; the air passage joint at the other end of the ventilation cover 803 is an adapter joint, and the adjacent adapter joints are communicated through a hose.
Specifically, in this embodiment, as shown in fig. 13, two ends of the ventilation cover 803 are respectively provided with 2 air channel connectors, the detection air channel is a U-shaped detection air channel, and the setting of the U-shaped detection air channel can reduce the volume of the ventilation cover, thereby further reducing the volume of the air quality monitoring device, reducing the material cost of the air quality monitoring device, and facilitating the carrying of the air quality monitoring device. At least 1 gas sensor is arranged on one side of the U-shaped detection gas circuit, and at least 1 gas sensor is arranged on the other side of the U-shaped detection gas circuit. For example, when the gas sensor layer includes 5 gas sensors, 2 gas sensors are disposed on one side of the U-shaped detection gas path, and 3 gas sensors are disposed on the other side of the U-shaped detection gas path.
Further, as an improvement of the gas path joint of the ventilation cover 803, the gas path joint is a pagoda joint for convenience in installing the gas sensor structure and other modules of the monitoring system.
In the present embodiment, the ventilation cover 803 is made of polytetrafluoroethylene material, and polytetrafluoroethylene has no pungent smell and does not affect the detection result of the ambient air. Meanwhile, polytetrafluoroethylene has the characteristics of chemical stability, corrosion resistance, good sealing performance, electrical insulation and the like, and the service life of the ventilation hood 803 can be prolonged.
As shown in fig. 9 and 11, the fixing member 802 includes a plurality of sets of pillar members located on the ventilation hood 803, each set of pillar members corresponding to one gas sensor, respectively.
Specifically, each set of pillar assemblies includes at least 2 sensor pillars 8022, the sensor pillars 8022 of each set of pillar assemblies are distributed around the gas sensor centering around the gas sensor, and blind holes (not shown in the drawing) with internal threads are formed on the top of the sensor pillars 8022. The fixed assembly 802 includes a sensor gland 8021 (where each gas sensor in fig. 9 is provided with a variety of corresponding sensor glands 8021; each gas sensor in fig. 11 is provided on one sensor gland 8021), and the sensor gland 8021 is provided with a through hole corresponding to a blind hole on the sensor post 8022. The screw 8023 passes through the through hole and is screwed into the blind hole, fixedly connecting the gas sensor layer with the ventilation cover 803.
Preferably, a gap is provided between the top of the sensor post 8022 and the lower surface of the sensor gland 8021. When the sensor gland 8021 is fixed on the sensor support 8022, the gas sensor is pressed down to have downward pressure on the sealing gasket, so that the sealing gasket is elastically deformed, and the gas sensor is tightly contacted with the ventilation cover to achieve a sealing effect.
Preferably, as a further improvement on the sensor pillar 8022, the sensor pillar 8022 is a copper pillar, and the copper pillar has the advantages of strong thermal conductivity and good strength, can be well manufactured for a gas sensor, and can enable heat on a gas detection gas hood to be rapidly dissipated.
Preferably, as an improvement on the sensor gland 8021, the sensor gland 8021 is made of ABS engineering plastics, which is also called as ABS material, is one of five synthetic resins, has excellent impact resistance, heat resistance, low temperature resistance, chemical resistance and electrical performance, and has the characteristics of easy processing, stable product size, low cost and the like.
The process of fixing the gas sensor mount to the ventilation mask 803 by the fixing assembly 802 is: first, a gas sensor main circuit board is fixed (crimped) on the upper portion of the sensor gland 8021; secondly, mounting at least 2 gas sensors on a gas sensor main circuit board; thirdly, sleeving a sealing gasket 804 on the outer side of the boss at the lower end of the gas sensor; then, each gas sensor of the gas sensor layer is placed into each groove of the ventilation mask 803; finally, the sensor gland 8021 is placed over the vent cover 803 with the through holes in the sensor gland 8021 aligned with the blind holes in the sensor post 8022, and the sensor gland 8021 is secured to the sensor post 8022 of the vent cover 803 with screws 8023.
Example 9:
the present embodiment is a detailed explanation of the gas flow rate control structure of the air detection circuit in embodiments 5 to 7.
In this embodiment, as shown in fig. 14, the gas flow control structure includes an MCU controller, an input end of the MCU controller is electrically connected with a gas flow meter module 3, an output end of the MCU controller is electrically connected with an air pump 4, and the gas flow control structure is used for controlling the flow of ambient air in the air inlet detection air path. In this embodiment, the gas flow meter module 3, the air pump 4, and the MCU controller are detachably fixed on the bottom plate 15 via brackets, respectively, and the bottom plate 15 is disposed on the bottom wall of the housing 1.
The working principle of the gas flow control structure is as follows: as shown in fig. 14, the air flow meter module 3 detects the flow feedback signal of the ambient air flow in the air detection air circuit, the MCU controller processes the flow feedback signal and sends PWM wave signals with different lengths to the air pump 4 to adjust the rotation speed of the air pump 4, and precise closed-loop control is performed on the flow of the ambient air in the air detection air circuit by forming between the air flow meter module 3, the MCU controller and the air pump 4, so as to improve the stability of the ambient air in the air detection air circuit.
The working process of the control of the air flow of the environment in the air detection gas circuit is as follows: the switch 12 is turned on, the air pump 4 and the air flow meter module 3 work, the air flow meter module 3 measures the airflow flow of the ambient air and sends airflow flow signals into the MCU controller, the MCU controller sends PWM wave signals with different lengths to the air pump 4, and the rotating speed of the air pump 4 is changed.
Example 10:
the present embodiment is a detailed explanation of the gas flow rate control structure of the air detection circuit in embodiments 5 to 7 and 9. After the detection of the concentration of the particulate matters in the ambient air is completed, in order to avoid the influence of the physical particulate matters on the detection of the gas components in the ambient air, and meanwhile, on the basis of simplifying the air detection air path structure, the particulate matters in the ambient air are prevented from blocking or even damaging the air pump 4 and the gas sensor structure 8.
In the present embodiment, as shown in fig. 2 to 5, in the ambient air quality monitoring device, the gas flow control structure is located between the particulate matter sensor structure 7 and the gas sensor structure 8, and the gas flow control structure further includes a filter structure 10. In the ambient air quality monitoring device shown in fig. 6, a filter structure 10 is provided at the front end of the gas sensor structure 8 to filter the ambient air entering the gas sensor structure 8.
As shown in fig. 15, the filter structure 10 includes a first filter 10-1, and in this embodiment, the first filter 10-1 is fixed to a filter holder 10-2, the filter holder 10-2 has a double-layered structure, the first filter 10-1 is located at one layer, and the filter holder 10-2 is detachably fixed to a base plate 15. The air inlet end of the first filter 10-1 is connected with the air outlet end of the particulate matter sensor structure 7 through a pipe, the air outlet end of the first filter 10-1 is connected with the air inlet end of the air pump 4 through a pipe, and the first filter 10-1 is used for filtering the ambient air entering the air pump 4 and the gas sensor structure 8 for the first time. The first filter 10-1 filters physical gas particle impurities in ambient air entering the air pump 4 and the gas sensor structure 8, prevents the particulate impurities in the ambient air from entering the air pump 4 to block the air pump 4 and entering the gas sensor structure 8 to affect the normal detection of each gas sensor, and can prevent the particulate impurities from accumulating in the gas sensor structure 8, improve the service life of the gas sensor structure 8 and reduce the maintenance frequency of the gas sensor structure 8.
The air flow direction of the ambient air in the air detection air circuit formed by the particulate matter sensor structure 7, the gas sensor structure 8 and the gas flow control structure is as follows: intake structure 2-particulate matter sensor structure 7-first filter 10-1-air pump 4-gas flowmeter module 3-gas sensor structure 8-exhaust valve 5. Working process of detection module in air detection gas circuit The method comprises the following steps: ambient air enters an air detection gas path through an air inlet structure 2 on the shell 1, and chemical signals of the concentration of particulate matters in the ambient air are detected through a particulate matter sensor structure 7; controlling the air flow in the air detection air circuit through the air flow control structure, and filtering the ambient air entering the air pump 4 and the air sensor structure; then the TVOC, CO, SO in the ambient air is detected via the gas sensor structure 8 2 、NO 2 、O 3 、H 2 Chemical signals of the concentration of the pollutant gas such as S; finally, the air is discharged from the shell 1 through an air outlet valve 5 on the shell 1. Meanwhile, the detected concentration data of the environmental air pollutants are sent to the environmental air monitoring mobile terminal through the communication module or the Bluetooth module.
Further, as shown in FIG. 15, the filter structure 10 includes a first filter 10-1 and a second filter 10-3, and the first filter 10-1 and the second filter 10-3 are fixed to a filter holder 10-2 having a double-layered structure. Wherein the air inlet end of the first filter 10-1 is connected with the air outlet end of the particulate matter sensor structure 7 through a pipeline, and the air outlet end of the first filter 10-1 is connected with the air inlet end of the air pump 4 through a pipeline; the air inlet end of the second filter 10-3 is connected with the air outlet end of the air pump 4 through a pipeline, and the air outlet end of the second filter 10-3 is connected with the air inlet end of the gas flowmeter module 3 through a pipeline. The first filter 10-1 is used for first filtering the ambient air entering the air pump 4 and the gas sensor structure 8, and the second filter 10-3 is used for second filtering the ambient air entering the gas sensor structure 8.
The air flow direction of the ambient air in the air detection air circuit formed by the particulate matter sensor structure 7, the gas sensor structure 8 and the gas flow control structure is as follows: the air inlet structure 2, the particulate matter sensor structure 7, the first filter 10-1, the air pump 4, the second filter 10-3, the gas flowmeter module 3, the gas sensor structure 8 and the exhaust valve 5. The working process of the detection module in the air detection gas circuit is as follows: ambient air enters an air detection gas path through an air inlet structure 2 on the shell 1, and chemical signals of the concentration of particulate matters in the ambient air are detected through a particulate matter sensor structure 7; then the gas flow control structure controls the air in the air detection gas circuitThe flow rate is that the first filter 10-1 is used for filtering the ambient air entering the air pump 4 for the first time, the second filter 10-3 is used for filtering the ambient air entering the gas sensor structure 8 after the ambient air is output by the air pump 4; then the TVOC, CO, SO in the ambient air is detected via the gas sensor structure 8 2 、NO 2 、O 3 、H 2 Chemical signals of the concentration of the pollutant gas such as S; finally, the air is discharged from the shell 1 through an air outlet valve 5 on the shell 1. Meanwhile, the detected chemical signals are sent to the ambient air monitoring mobile terminal through the communication module or the Bluetooth module.
Example 11:
the present embodiment is a detailed explanation of the intake structure 2 and the exhaust valve 5 of the air detection circuit in embodiment 3.
As shown in fig. 16, the intake structure 2 includes an intake valve main valve 2-1, and a filter screen (not shown) is provided at an upper portion of the intake valve main valve 2-1, and is fixed to the intake valve main valve 2-1 via an intake valve gland (not shown). The main valve 2-1 of the air inlet valve is provided with a plurality of through holes 2-4, and each through hole 2-4 is connected with an air inlet joint 2-5. In this embodiment, the air inlet joint 2-5 is connected to the main valve 2-1 of the air inlet valve by an advanced laser welding process.
In this embodiment, the main valve 2-1 of the air intake valve and the air intake valve gland are welded by an advanced laser welding process, so that the welding spots are uniform and firm and high, the connection stability of the main valve 2-1 of the air intake valve and the air intake valve gland is improved, and the air intake structure 2 of this embodiment can be suitable for non-rainy environments in and out of a vehicle.
Further, as an improvement on the filter screen, the filter screen is a 200-400 mesh stainless steel filter screen, the chemical property of the stainless steel filter screen is stable, the stainless steel filter screen can not chemically react with components in the ambient air, and the accuracy of ambient air monitoring is ensured. Meanwhile, the 200-400-mesh filter screen can filter foreign matters such as catkin, insects, leaves and the like in the ambient air by 60-90%, so that the risk of blocking or damaging an air detection gas circuit and a detection module is reduced or even avoided. Preferably, the filter screen is a 300-mesh stainless steel screen.
Further, as shown in fig. 16, the air intake structure 2 further includes a rain cover structure 2-6, the rain cover structure 2-6 is in threaded connection with the air intake valve gland, and the rain cover structure 2-6 is used for blocking rainwater from entering the main valve 2-1 of the air intake valve. The arrangement of the rain cover structure 2-6 enables the environmental air quality monitoring device to be used in the environment of rainwater outside the vehicle, and rainwater is prevented from entering the air detection air circuit through the air inlet structure 2. The rain cover structure 2-6 is made of alloy materials, such as aluminum alloy materials, and has the characteristics of light weight, stable chemical property and no chemical reaction with components in the ambient air. In this embodiment, the rain cover structure 2-6 is made of a high-quality aluminum alloy material.
Preferably, the rain cover structure 2-6 made of the alloy material is coated with an oxide film layer, and the oxide film layer can improve the stability of the rain cover structure and prevent the rain cover structure from being oxidized or corroded and damaged in a high-humidity environment or a rainwater environment.
Preferably, the air inlet connector 2-5 is a pagoda connector, and the pagoda connector can ensure that ambient air smoothly enters the air path pipeline through the main valve 2-1 of the air inlet valve.
Preferably, the exhaust valve 5 of the air detection air path can be arranged on the side wall of the square shell frame 101, and also can be arranged on the panel 102, and is made of alloy materials, such as aluminum alloy materials, and the exhaust valve 5 made of the aluminum alloy materials has the advantages of durability and strong thermal conductivity, and can play a role in radiating while exhausting the detected ambient air.
Example 12:
this example is an improvement over the air quality monitoring system of example 3.
As shown in fig. 2 to 7, the air quality monitoring system further comprises a temperature-humidity-pressure sensor 9 arranged on the inner wall of the housing 1, and as shown in fig. 2, the temperature-humidity-pressure sensor 9 is electrically connected with the communication module through a temperature-humidity-pressure sensor circuit board. The temperature-humidity-pressure sensor 9 is used for measuring the temperature, humidity and atmospheric pressure of the detected ambient air, so that personnel can know the environmental information of the current position conveniently, and the altitude information of the current position can be calculated according to the information.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (9)

1. The remote calibration method for the sensor for monitoring the ambient air is characterized by comprising the following steps of: the remote calibration method of the sensor adopts a server, an ambient air monitoring mobile terminal and an air quality standard monitoring station to remotely calibrate the sensor of the ambient air quality monitoring device, and specifically comprises the following steps:
step 1, an ambient air quality monitoring device moves to a distance range of an air quality standard monitoring station M, and original data and current position coordinate information of ambient air pollutants are collected;
step 2, operating the ambient air monitoring mobile terminal by a user, and sending a sensor calibration request to a server;
step 3, the server receives a sensor calibration request, and simultaneously, the server receives the original data of the environmental air pollutants and the current position coordinate information sent by the environmental air quality monitoring device;
step 4, the server inquires an air quality standard monitoring station corresponding to the position of the current position coordinate information, and acquires pollutant standard data corresponding to the sensor in the air quality standard monitoring station;
step 5, the server derives a sensor calibration formula according to the ambient air raw data and the pollutant standard data, wherein the sensor calibration formula is as follows: y=x ʹ +b, y is a value after calibration of sensor contamination of the ambient air quality monitoring device, and x ʹ is raw data of ambient air contamination The value obtained after filtering treatment, b is the intercept; wherein x ʹ =x 1 /2+x 2 /3+x 3 First three packages x collected by/6, x ʹ environmental air quality monitoring device 1 、x 2 、x 3 The filtered values of the original data of the environmental air pollutants; b=x-
Figure QLYQS_1
X is the average value of the pollutant concentration of the air quality standard monitoring station in Q minutes, and N is the number of collected data packets;
step 6, the server sends a sensor calibration formula to the ambient air quality monitoring device, and remotely calibrates a sensor of the ambient air quality monitoring device;
and 7, the environmental air quality monitoring device sends a calibration success feedback instruction to the environmental air monitoring mobile terminal, and calibration of a sensor in the environmental air quality monitoring device is completed.
2. The method for remote calibration of a sensor of claim 1, wherein:
the step 1 comprises the following steps:
step 1.1, moving an ambient air quality monitoring device to an air quality standard monitoring station M distance range;
step 1.2, starting up the mobile terminal by using the environmental air quality monitoring device and the environmental air monitoring device to preheat;
step 1.3, detecting and collecting original data of environmental air pollutants by each sensor in the environmental air quality monitoring device, and acquiring current position coordinate information of the environmental air quality monitoring device;
The step 2 comprises the following steps:
step 2.1, a user inputs a device number corresponding to an ambient air quality monitoring device in an ambient air monitoring mobile terminal, and checks the ambient air pollutant original data and the current position coordinate information of the ambient air quality monitoring device;
2.2, after K minutes, the user operates in the ambient air monitoring mobile terminal, and a sensor calibration request is sent to a server;
the step 3 comprises the following steps:
step 3.1, a server receives a sensor calibration request sent by the environmental air monitoring mobile terminal in step 2.2;
and 3.2, the server inquires an air quality standard monitoring station corresponding to the current position coordinate information, and pollutant standard data corresponding to the sensor in the air quality standard monitoring station are obtained.
3. The utility model provides an environment air quality monitoring device of environment air monitoring, includes the casing and is located the air quality monitoring system of casing, be equipped with the sensor in the air quality monitoring system, its characterized in that: the application of an ambient air quality monitoring device to the sensor remote calibration method of any one of claims 1 to 2 for remotely calibrating the sensor;
the air quality monitoring system is internally provided with a control unit, the control unit comprises a main circuit board, the main circuit board is fixed in the shell through a main circuit board bracket, a positioning module and a communication module are arranged on the main circuit board, and the positioning module is electrically connected with the communication module; the positioning module is used for positioning the environmental air quality monitoring device in real time and sending the current position coordinate information of the environmental air quality monitoring device to the environmental air monitoring mobile terminal through the communication module; the communication module is also in bidirectional electrical connection with each sensor in the ambient air quality monitoring device, and is used for receiving the ambient air pollutant raw data of the sensor and transmitting the ambient air pollutant raw data to the ambient air monitoring mobile terminal, and is also used for receiving the sensor pollutant calibration data sent by the ambient air monitoring mobile terminal, transmitting the sensor pollutant calibration data to the sensor and remotely calibrating the sensor;
The air quality monitoring system further includes a gas flow control structure positioned between the particulate matter sensor structure and the gas sensor structure; the air flow control structure comprises an MCU controller and a filter structure, wherein the input end of the MCU controller is electrically connected with an air flowmeter module, the output end of the MCU controller is electrically connected with an air pump, the air flow control structure is used for controlling the flow of air in an air detection air circuit, and the air outlet end of the filter structure is connected with the air pump;
the temperature-humidity-pressure sensor is arranged on the inner wall of the shell, and is electrically connected with the communication module through the temperature-humidity-pressure sensor circuit board and used for measuring the temperature, humidity and atmospheric pressure of the detected ambient air.
4. An ambient air quality monitoring device according to claim 3, wherein: the air quality monitoring system is provided with 1 air detection air path, the air detection air path is provided with a particle sensor structure, the particle sensor structure comprises a plurality of particle sensors, and the particle sensors are used for detecting the concentration of particles in ambient air;
And the ambient air enters the air detection air path, is detected by the particulate matter sensor, and is discharged by the air detection air path.
5. The ambient air quality monitoring device of claim 4, wherein: the ambient air output end of the particulate matter sensor structure is connected with a gas sensor structure and a gas flow control structure through a pipeline; the gas sensor structure is used for detecting the concentration of pollutant gas in the ambient air; the gas flow control structure is used for introducing ambient air into the gas sensor structure and filtering and controlling the flow of the ambient air entering the gas sensor structure;
ambient air enters the air detection air path, sequentially passes through the particulate matter sensor structure, the gas flow control structure and the gas sensor structure, and is discharged through the air detection air path after being detected.
6. An ambient air quality monitoring device according to claim 3, wherein: 2 air detection air paths are arranged on the air quality monitoring system, wherein 1 air path is a particulate matter detection air path, and the other air path is a gas detection air path;
the particle detection air circuit comprises a particle sensor structure and a vacuum pump, wherein the vacuum pump sucks ambient air into the particle detection air circuit, and the ambient air is discharged through the particle detection air circuit after being detected by the particle sensor structure;
The gas detection gas circuit comprises a gas flow control structure and a gas sensor structure, wherein the gas flow control structure is used for introducing ambient air into the gas detection gas circuit and filtering and controlling the flow of the ambient air entering the gas sensor structure; the gas sensor structure is used for measuring the concentration of each gas in the ambient air; the gas flow control structure sucks ambient air into the gas detection gas circuit, filters and controls flow through the gas flow control structure in sequence, detects through the gas sensor structure, and finally discharges through the gas detection gas circuit.
7. An ambient air quality monitoring device according to claim 3, wherein: 2 air detection air paths are arranged on the air quality monitoring system;
the 1 st air detection air path is a particulate matter detection air path, the particulate matter detection air path comprises a particulate matter sensor structure and a vacuum pump, the vacuum pump sucks ambient air into the particulate matter detection air path, and the ambient air is discharged through the particulate matter detection air path after being detected by the particulate matter sensor structure;
the environment air output end of the particulate matter sensor structure of the particulate matter detection air circuit is connected with a gas detection air circuit through a pipeline, and the gas detection air circuit comprises a gas flow control structure and a gas sensor structure; the gas detection gas circuit is communicated with the particulate matter sensor structure to form a gas comprehensive detection gas circuit, and the gas flow control structure is used for introducing ambient air into the gas comprehensive detection gas circuit and filtering and controlling the flow of the ambient air entering the gas sensor structure; the gas sensor structure is used for measuring the concentration of each gas in the ambient air; the gas flow control structure sucks ambient air into the gas comprehensive detection gas circuit, the ambient air is detected by the particulate matter sensor structure, the ambient air is filtered and flow is controlled by the gas flow control structure, the ambient air is detected by the gas sensor structure, and the ambient air is finally discharged by the gas detection gas circuit.
8. The ambient air quality monitoring device of any one of claims 5 to 7, wherein: the gas sensor structure comprises a gas sensor layer and a ventilation cover, wherein the gas sensor layer is fixedly arranged on the ventilation cover through a fixing component;
the two ends of the ventilation hood are respectively provided with a gas passage joint, at least 2 grooves are processed on the upper surface of the ventilation hood, the gas passage joints are communicated with the grooves and the adjacent grooves through gas passage pipelines positioned in the ventilation hood, and the gas passage joints, the gas passage pipelines and the grooves are communicated to form a detection gas passage of ambient air;
the gas sensor layer comprises a plurality of gas sensors, the gas sensors are mounted on the grooves, detection cavities are formed between the lower surfaces of the gas sensors and the bottoms of the grooves, and the gas sensors are used for detecting the concentration of pollutant gas in the ambient air in the detection gas circuit.
9. The ambient air quality monitoring device of claim 8, wherein: the gas sensor layer comprises at least 2 gas sensors, and each gas sensor is independently installed and fixed on the ventilation cover through the fixing component;
Or the gas sensor layer comprises at least 2 gas sensors, and at least 2 gas sensors are integrated together and are mounted and fixed on the ventilation cover through the fixing component.
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