CN111766273B - System and method for performing atmosphere meshing monitoring by utilizing gas sensor array - Google Patents
System and method for performing atmosphere meshing monitoring by utilizing gas sensor array Download PDFInfo
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Abstract
The invention relates to an atmospheric gridding monitoring system by utilizing a gas sensor array, which comprises the following components: and the gas sensing unit and the cloud server. The quantity of the gas sensing units corresponds to the quantity of the air monitoring stations which are arranged in a grid mode in the monitoring area, and at least one monitoring signal which is collected by the air sensing units and can reflect the pollution degree of the target gas can be sent to the cloud server; the cloud server can convert monitoring signals sent by the gas sensing units in the monitoring area into monitoring data. The gas sensing unit comprises at least two sensors integrated on the same substrate, so that the gas sensing unit can detect target gas in an array mode, and the defects of poor gas selectivity and cross response of the traditional metal oxide sensor are overcome.
Description
Technical Field
The invention relates to the technical field of air monitoring, in particular to an atmosphere meshing monitoring system by utilizing a gas sensor array.
Background
With the development of industrial technology in China, air pollution becomes an important factor for restricting the development of the technology. The atmosphere grid monitoring is used as a supplement to the current commercial control monitoring station, and has the characteristics of relatively low cost, easy construction and wide coverage. The atmosphere gridding monitoring becomes a development trend in the fields of environment monitoring and atmosphere pollution early warning under the parallel policy of environment protection and emergency development in the new era. For example, the conventional miniature monitoring stations on the market comprise SGA-500A-AQI equipment of Shenzhen Shen national An electronic technology Co., ltd., AQMS-300 equipment of concentrating technology, and XHAQSN-808 equipment of Hebei pioneer environmental protection.
In addition, as another example, the chinese patent publication No. CN107612999a discloses an atmospheric gridding accurate monitoring system, which includes a sensor, a standard instrument and a cloud server, where the standard instrument and the sensor are integrated with a wireless communication device, and are used for transmitting a monitoring signal to the cloud server, the monitoring system mainly introduces the standard instrument, and is used for calibrating the sensor, so that a measured value is more accurate, when the system is used, firstly, an area to be monitored is monitored in a relatively stable period, the sensor and the standard instrument respectively transmit the monitoring signal to a cloud computer, the cloud computer converts the monitoring signal into atmospheric monitoring data, the data from the sensor and the data from the standard instrument are compared and calibrated, and thus, a sensor data calibration formula is formed, after calibration, the sensor transmits the monitoring signal to the cloud computer every time, and the cloud computer converts the monitoring signal into the atmospheric monitoring data according to the calibration formula, and then carries out calibration to obtain corrected atmospheric monitoring data, so as to realize accurate atmospheric monitoring.
Currently, the gas sensors widely adopted in the miniature air station are often electrochemical sensors, and each type of gas corresponds to one sensor, namely, a single device is provided with four different types of electrochemical gas sensors. As the time of use increases, consumption of electrolyte in electrochemical sensors, aging of electrodes, and degradation of the filtering effect of the filtering membrane can cause drift in the sensor baseline and changes in sensitivity, and thus lifetime tends to be between one and two years.
Furthermore, there are differences in one aspect due to understanding to those skilled in the art; on the other hand, as the inventor studied numerous documents and patents while the present invention was made, the text is not limited to details and contents of all the details and contents, but it is in no way the present invention does not have the features of the prior art, but the present invention has all the features of the prior art, and the applicant remains in the background art to which the rights of the related prior art are added.
Disclosure of Invention
In order to overcome the shortcomings of the prior art, the present invention provides a system for performing an atmospheric meshing monitoring using a gas sensor array, comprising: the quantity of the gas sensing units corresponds to the quantity of the air monitoring stations arranged in a gridding manner in the monitoring area, at least one monitoring signal which is collected by the gas sensing units and can reflect the pollution degree of target gas can be sent to the cloud server, the cloud server converts the monitoring signal sent by the gas sensing units in the monitoring area into monitoring data, and the gas sensing units comprise at least two sensors which are integrated on the same substrate, so that the gas sensing units can detect the target gas in an array manner.
According to a preferred embodiment, the gas sensing unit integrates the sensor in the form of an array of at least two different sensing pixels.
According to a preferred embodiment, the sensor is a metal oxide gas sensor.
According to a preferred embodiment, the cloud server can compare the data to be calibrated acquired by the gas sensing unit in a time period with standard data of a portable gas analyzer, so as to generate a calibration model of the monitoring system.
According to a preferred embodiment, the gas sensor unit is preceded by a gas drying unit, so that the gas drying unit can dry the target gas before the target gas enters the gas sensor unit, wherein the gas drying unit is built-in with at least two drying chambers which can be conducted with the gas sensor unit and are connected in parallel to each other, so that the target gas entering the gas sensor unit can be in a suitable humidity range. In the invention, the gas drying unit comprises a plurality of drying chambers which are connected in parallel. A desiccant is placed in the drying chamber. Each drying chamber is communicated with the gas circuit switching device. The drying agent can be dehumidified by the heater, so that the effect of repeated recycling is achieved. The processor is capable of introducing a target gas from an operating drying chamber into another drying chamber that has not been operated, based on the amount of humidity change, while closing the operating drying chamber. For example, the variation of the humidity before drying and the humidity after drying is about equal to 0, which proves that the drying chamber in operation has lost the dehumidification function, that is, when the drying agent is gradually deactivated, the processor can start the air path switching device to switch the air path to enable the air to pass through the other drying chamber, so that the effective removal of the humidity is realized. The set of air inlet drying and filtering system can keep the air flowing into the sensor air cavity at a stable humidity and keep the sensor head clean; meanwhile, due to the design of multiple switchable paths, the maintenance frequency can be reduced, the gridding atmosphere monitoring is facilitated, and long-term and stable humidity and dust interference control can be realized.
According to a preferred embodiment, the at least two drying chambers are each provided with a heater, so that the drying unit can continuously dehumidify the target gas in such a manner that the at least two drying chambers are spaced apart.
According to a preferred embodiment, the at least two parallel drying chambers are each capable of communicating with an air path switching device, and the air path switching device is capable of guiding the target gas to be measured from one drying chamber to the other drying chamber in the case that a processor sends a switching instruction generated based on the humidity change amount of the target gas before and after drying to the air path switching device.
According to a preferred embodiment, the processor sends a switching instruction to the air path switching device in such a way that the humidity of the target gas after drying via the drying chamber can be within a preset range of the air sensing unit.
According to a preferred embodiment, the invention discloses an atmosphere gridding monitoring method of a gas sensor array, comprising the following steps: arranging gas sensing units corresponding to the number of air monitoring stations arranged in a grid manner in a monitoring area, and connecting the gas sensing units with a cloud server in a communication manner so that the gas sensing units can send at least one monitoring signal which is collected by the gas sensing units and can reflect the pollution degree of target gas to the cloud server, wherein the cloud server is configured to convert the monitoring signals sent by the gas sensing units in the monitoring area into monitoring data, and the gas sensing units are configured to comprise at least two sensors integrated on the same substrate so that the gas sensing units can detect the target gas in an array manner.
According to a preferred embodiment, in the method the gas sensing unit integrates the sensor in the form of an array of at least two different sensing pixels.
Drawings
FIG. 1 is a schematic block diagram of a monitoring system according to the present invention; and
fig. 2 is a schematic diagram of a drying implementation provided by the present invention.
List of reference numerals
100: gas sensing unit 600: drying unit
200: cloud server 600a: drying chamber
300: portable gas analyzer 600b: heater
400: processor 700a: first humidity sensor
500: the gas path switching device 700b: second humidity sensor
Detailed Description
The following is a detailed description with reference to fig. 1 and 2.
Example 1
The embodiment discloses an atmospheric gridding monitoring system using a gas sensor array, comprising: a gas sensing unit 100 and a cloud server 200.
The arrangement position of the miniature workstation needs to comprehensively consider factors such as population density, pollution source density, gas circulation degree, communication signal intensity and the like. Generally, in places with high population densities, denser sites need to be arranged; around factories, construction sites and urban arterial roads. Denser sites need to be deployed; the stations are generally arranged at places where the open air flows smoothly, such as roofs, lampposts and the like; the station needs to have good signal strength to realize 2G/3G/4G network uploading. By combining the analysis of meteorological data and municipal traffic data, dense distribution can be performed in a targeted manner at a pollution source downwind opening and a city congestion road section, so that monitoring is more representative.
Atmospheric environmental monitoring is one of the important actions for atmospheric early warning and treatment. More and more intelligent devices and intelligent methods are applied to the field. For example, the patent with application number of CN201512663989. X discloses an atmospheric environment parameter real-time measurement system, which realizes the rapid real-time measurement and monitoring of atmospheric environment parameters by multiple points through a self-organizing network wireless communication technology, and is suitable for the grid high-density real-time multi-parameter synchronous measurement of the atmospheric environment parameters. For example, the patent with application number CN201610621570.1 discloses a device and a method for regional air quality control, which are used for densely and gridding meteorological and atmospheric pollutant detection instruments in a certain region, simultaneously carrying out on-line monitoring on the working conditions and the emission reduction efficiency of emission reduction facilities of various pollution sources for discharging waste gas in the region, and providing an automatic air sampling device when the set conditions are met; the online monitoring data are uploaded to a central server through the Internet for big data processing analysis, pollutant concentration change and scene analysis of preset space point positions are predicted, and a control strategy is optimized, so that accurate monitoring and control of air quality are realized.
Therefore, the gas sensor unit 100 and the cloud server 200 in this embodiment may be products in the prior art. Moreover, the implementation of communication between the gas sensing unit 100 and the cloud server 200 is also well known in the art, and therefore, a detailed description is omitted.
In the present invention, the number of the gas sensing units 100 corresponds to the number of the air monitoring stations arranged in a grid manner in the monitoring area, and at least one monitoring signal capable of reflecting the target gas pollution level collected by the air sensing units can be sent to the cloud server 200. The cloud server 200 converts the monitoring signals sent by the gas sensing units 100 in the monitoring area into monitoring data for displaying the degree. Preferably, the gas sensing unit 100 integrates the sensor in the form of an array of at least two different sensing pixels. Preferably, the sensor is a metal oxide gas sensor. The sensing pixels are single gas sensors. When two or more different arrays of gas sensors, also referred to as sensing pixels, analog image sensors are used to sense a pixel in the array. The different sensing pixels (sensors) used herein include sensors of different metal oxides, or sensors of the same metal oxide modified with different metals, or sensors of the same kind operating at different heating temperatures, etc. The arrangement of the gas sensors is not fixed, and may be a circular array or a square array. The key is that a plurality of different sensors are arranged in a small area, so that the gas atmosphere contacted by the different sensors is kept uniform.
The signals of the sensors in the gas sensor array need to pass through an identification algorithm to obtain gas concentration information. After a gas or gases is/are contacted with an array of gas sensors, the response of each sensor in the array to the same gas atmosphere is different, so that the response of different sensors in the array constitutes a specific response profile of the array to the gas atmosphere, which may also be referred to as a response pattern. The recognition of the response mode can be realized by using a mode recognition algorithm such as KNN, SVM and the like, and then the information of the gas to be detected is obtained. The specific flow is 1), exposing the gas sensor array to a known atmosphere in a laboratory, and recording response data of all sensors in the array; 2) Changing the gas atmosphere, and recording array response modes under different gas atmospheres; 3) Training an identification algorithm by using the obtained data; 4) And performing field test on the unknown gas range by using a trained identification algorithm. The following example is an array containing 16 sensors, and after the PCA algorithm, the response of the array to hydrogen, nitrogen dioxide, formaldehyde and toluene can be distinguished, so as to obtain information of gas types and concentrations. The pattern recognition algorithm can be operated on an on-board microprocessor in the miniature air station according to the complexity, and the gas type and concentration information can be directly uploaded to the cloud. The raw data of all the sensors can be directly uploaded to the cloud, and the gas concentration type and concentration information are displayed after the cloud server calculates a pattern recognition algorithm.
Ideally, the number of gas sensors is equal to the number of types of gas to be measured, in which case each gas sensor is responsive to only one gas, i.e. has absolute selectivity; however, in reality, the metal oxide gas sensor is often responsive to multiple gases, and a single sensor cannot be used for performing a targeted test on a certain gas. The inventors have thus adopted the strategy of using a very large number of sensors (e.g. using 16 sensors to test 4 gases) than the number of gas species to be tested to form an array, and each sensor has a difference in response to the gas species to be tested. When the gas sensor array is contacted with one or a plurality of gases to be detected, the response (such as the proportional change of the resistance) of the sensors in the array has a differential distribution, and the contacted gas type and concentration are obtained by analyzing the response distribution diagram and combining a pattern recognition algorithm.
The signal output by the sensor can obtain the gas concentration and type information after the identification algorithm. When the sensor is subjected to factory calibration and recognition algorithm training, different gas atmospheres are created under a certain temperature and humidity combination, and then output data of the sensor array are recorded for training the recognition algorithm of the different gas atmospheres under the temperature and humidity combination. And then changing the temperature and humidity combination to obtain a new identification algorithm of different gas atmospheres under the temperature and humidity combination. Similarly, corresponding recognition algorithms are trained under different temperature and humidity gradient combinations (the temperature is 0-40 ℃ and the humidity is 20-90%). Therefore, in actual use, besides the output of the sensor array, the temperature and humidity information at the moment is recorded, and then an identification algorithm closest to the temperature and humidity combination is selected to convert the output of the array into the gas type and concentration.
The micro workstation continuously performs, and data are uploaded to the cloud end at intervals. If the pollutant fluctuation with time is smaller, the data uploading frequency (such as once in 5 minutes) can be properly reduced, and the data flow consumption is reduced; if the concentration of the pollutant is suddenly changed, the movement of the pollutant needs to be accurately monitored, or special monitoring needs are required in a specific time period of a specific area (such as robbery monitoring), the uploading frequency of the data can be increased (such as once in 5-30 seconds), so that more accurate data can be obtained.
Example 2
The embodiment discloses an atmosphere meshing monitoring method of a gas sensor array. This embodiment may be further improved and/or supplemented in embodiment 1 or a combination thereof, and the repeated description will not be repeated. This embodiment discloses that, in the case of no conflict or contradiction, the whole and/or partial content of the preferred embodiments of other embodiments can be complemented by this embodiment.
Preferably, the cloud server 200 can compare the data to be calibrated acquired by the gas sensing unit 100 in a time period with the standard data of the portable gas analyzer 300, so as to generate a calibration model of the monitoring system. In remote calibration applications, the mini-air station will upload raw data of the sensor array, ambient temperature, ambient humidity to the cloud; and meanwhile, uploading the data of the adjacent standard gas analyzers to the cloud. And after accumulating enough response data of different gas atmospheres under the temperature and humidity combination at the cloud end, retraining an identification algorithm under the temperature and humidity combination. Training of the recognition algorithm of other temperature and humidity combinations is also performed according to the steps.
Example 3
The embodiment discloses an atmosphere meshing monitoring method of a gas sensor array. Further improvements and/or additions to embodiments 1, 2 or combinations thereof are possible in this embodiment, and the repeated descriptions are omitted. This example discloses that the whole and/or part of the contents of the preferred implementation of other examples can be complemented by this example without causing conflict or contradiction.
For metal oxide semiconductor gas sensors (air detection units), humidity, i.e., water molecules, have a variety of effects on the surface of the gas sensitive material, including changing the number of free electrons, changing electron affinity or occupying active sites, etc., which results in a drift in the sensor baseline and a change in the sensitivity to the target gas response. For electrochemical gas sensors, humidity can affect the rate of redox reactions at the electrodes, which in turn can cause baseline drift and changes in sensitivity to target gas responses. Since the sensor is typically calibrated under dry air conditions before shipment, a higher humidity in actual use has a greater impact on the sensitivity of the sensor. (an atmosphere below 20% relative humidity may be approximately dry air) since in outdoor applications the relative humidity may vary from 30% to 95% in different seasons and may vary by a factor of two, requiring that the sensor must be humidity compensated for accurate gas concentration data (active compensation) or that the air humidity be controlled to a small reasonable range (e.g., less than 50%, i.e., passive compensation).
Preferably, the gas sensing unit 100 is preceded by a gas drying unit 600 so that the gas drying unit 600 can dry the target gas before the target gas enters the gas sensing unit 100. In the invention, the gas drying unit comprises a plurality of drying chambers which are connected in parallel. A desiccant is placed in the drying chamber. Each drying chamber can be communicated with the gas circuit switching device. The desiccant can be dehumidified by the heater, so that the effect of repeated recycling is achieved. The processor 400 can introduce the target gas from the operating drying chamber into another drying chamber that has not been operated, and shut down the operating drying chamber based on the amount of humidity change. For example, the variation of the humidity before drying and the humidity after drying is about equal to 0, which proves that the drying chamber in operation has lost the dehumidifying function, that is, when the drying agent is gradually deactivated, the processor can start the air path switching device to switch the air path to enable the air to pass through the other drying chamber, so that the humidity is effectively removed. The set of air inlet drying and filtering system can keep the air flowing into the sensor air cavity at a stable humidity and keep the sensor head clean; meanwhile, due to the design of multiple switchable paths, the maintenance frequency can be reduced, the gridding atmosphere monitoring is facilitated, and long-term and stable humidity and dust interference control can be realized. The first humidity sensor 700a measures the humidity of the target gas before it enters the drying unit 600. After the target gas is dried by the drying unit 600, the second humidity sensor 700b measures the humidity of the target gas after drying. The humidity measured by the first humidity sensor 700a and the second humidity sensor 700b is signaled to the processor 400. The processor 400 can calculate the amount of change in humidity.
Preferably, at least two drying chambers 600a are each provided with a heater 600b so that the drying unit 600 can continuously dehumidify the target gas in such a manner that at least two drying chambers 600a are spaced apart. Because miniature air monitoring station sets up in the open air, consequently, power supply unit mainly adopts solar energy power generation or wind power generation, and it can gather the energy of nature and independently supply power, can effectively reduce power supply unit's maintenance and battery replacement. And, the heater 600b is not turned on at any time to heat, and it can heat and dehumidify the drying chamber at night, and the heating device can be charged by solar energy in daytime. The heater 600b can be activated after the drying chamber 600a corresponding thereto dries the gas and while in an idle state for heating and dehumidifying the drying chamber 600 a. Preferably, the heater 600b is capable of being activated in response to a heating instruction of the processor 400 for heating and dehumidifying the drying chamber 600 a. The processor 400 may issue a heating command to the heater 600b in case that a certain number of drying chambers 600a are used in the dryer 600, so that the drying chambers 600a that have been used can be simultaneously electrically conductive to dehumidify, in such a manner that the power supply apparatus can have a sufficient power supply. Alternatively, the processor 400 may monitor the power of the power supply device, and calculate the number of the heaters 200b that can be activated by the power value.
Preferably, the processor 400 transmits a switching instruction to the air path switching device 500 in such a manner that the humidity of the target gas can be within a preset range of the air sensing unit 300 after being dried through the drying chamber 600 a. The humidity value of the dried target gas through the drying chamber 600a needs to satisfy a certain humidity environment so that the sensor in the gas sensing unit 100 can be cleaned under the effect of the target gas, which is advantageous for improving the sensitivity of the sensor. Therefore, the processor 400 generates a switching instruction to cause the gas switching device 500 to switch the next drying chamber 600a to meet the humidity requirement in the case where the humidity of the target gas is not within the preset range of the gas sensing unit 100 after being dried through the drying chamber 600 a.
Preferably, the processor 400 is capable of communicative connection with the cloud server 200. For example, the processor 400 and the cloud server 200 may be connected using a communication protocol such as 4G, 5G, wifi, etc.
In the actual operation process, the humidity of the drying agent can be along with the service time t of the corresponding drying chamber n And increases, which causes the humidity of the air entering the gas sensor unit 100 to change during this time, on the one hand, which causes the need to reconfigure the parameters of the gas sensor unit 100 when switching to the next drying chamber, and increases the configuration control functions of the processor 400 on the gas sensor unit 100; on the other hand, the service life of the desiccant is reduced. For this purpose, the present embodiment discloses a preferred method of using the drying chamber: and returning the detected air to the drying chamber to dry the drying agent for the second time. The specific steps thereof can be combined with the steps shown in fig. 2:
1. and drying the air to be detected in a manner that the variation of the humidity of the drying agent in the drying chamber after one service time is minimized. By minimizing is meant: the drying agent can be used for drying or approximately drying the detected air after the air to be monitored is dehumidified. The specific examples are: reducing the one-time service time of each drying chamber. For example, the drying unit 600 is provided with 8 drying chambers, and the drying period is 3 days, that is, each drying chamber has a service time of 9 hours (the service time of 9 hours, and needs to be replaced); in this embodiment, the service time of each drying chamber is 3 hours, and after the service time is 3 hours, the drying chamber can be switched to the next drying chamber, and the drying chamber can be dried by returning detected air during the non-service time to improve the service time (in this way, the service time can be improved by about 1 time). The humidity of the drying agent in the drying chamber can be reduced after one service time, and the detected air is blown to be dried. Preferably, the variation of the humidity of the drying agent in the drying chamber after one service time is controlled to be about 20% -40%. Thus, the first and second substrates are bonded together,
2. during service in the n-1 th drying chamber, the detected air is returned to the n-th drying chamber. As shown in fig. 2, during the service of the 2 nd drying chamber, the dried gas is detected by the gas sensing unit 100 and then returned to the 3 rd drying chamber (next drying chamber) to blow-dry the drying agent therein. According to the mode, on one hand, the drying agent can be recycled, the service life of the drying agent is prolonged, and the replacement frequency and the maintenance frequency are reduced; on the other hand, the humidity fluctuation of the air to be detected entering the gas sensing unit 100 becomes small, so that the influence of the large air humidity gradient entering the gas sensing unit 100 on the sensitivity of the gas sensing unit 100 after each switching is avoided or substantially avoided, that is, the embodiment can make the air humidity entering the gas sensing unit 100 fluctuate within a narrow range, so that the gas sensing unit 100 can quickly and quickly measure the air quality without parameter configuration or reducing the parameter configuration frequency. Meanwhile, the mode of drying the drying agent by the detected air in a back flow mode can reduce the usage amount of the heater, and electric energy is saved.
Example 4
The embodiment discloses an atmosphere meshing monitoring method of a gas sensor array. Further improvements and/or additions to embodiments 1, 2, 3 or combinations thereof are possible in this embodiment, and the repeated descriptions are omitted. This example discloses that the whole and/or part of the contents of the preferred implementation of other examples can be complemented by this example without causing conflict or contradiction.
Since the air sensor unit 300 integrates different types of gas sensors in an annular array or a matrix array, the amount of gas to be detected that each gas sensor contacts is completely different, namely: the gas sensor near the center area of the substrate contacts a greater amount of the gas to be detected, while the gas sensor near the edge of the substrate contacts a reduced amount of the gas to be detected. This has not met the air requirements for contaminant detection, specifically: gas sensors near the edge of the substrate may not be able to effectively identify contaminants, so that the micro-workstation may not accurately acquire air quality information.
The present embodiment provides a gas guide plate to be detected, which is provided at the front end of the air sensor unit 300 in such a manner that the gas sensor on the air sensor unit 300 can be uniformly or substantially uniformly contacted to the gas to be detected. The guiding plate is capable of guiding the gas to be monitored to the respective gas sensor. The guide disc is provided with different grid holes for dividing the air flow to each gas sensor approximately uniformly, so that the gas quantity contacted by the gas sensors is approximately equal, and the micro workstation can accurately acquire air quality information.
Example 5
The embodiment discloses an atmosphere meshing monitoring method of a gas sensor array. This embodiment may be further improved and/or supplemented by one of embodiments 1, 2, 3 or a combination thereof, and the repeated descriptions will not be repeated. This example discloses that the whole and/or part of the contents of the preferred implementation of other examples can be complemented by this example without causing conflict or contradiction.
The monitoring method comprises the following steps:
s1: the gas sensing units 100 corresponding to the number of air monitoring stations arranged in a grid within the monitoring area are arranged. For example, the air monitoring stations can be arranged according to the industrial layout of a certain city, and for the regional arrangement of heavy industry, the arrangement density of the air monitoring stations is higher; while for areas of relatively little pollution, such as the cultural industry, the arrangement density of air monitoring stations is smaller. Typically, the number of air monitoring stations corresponds to the number of gas sensing units 100. However, it is also possible that: the number of gas sensing units may be twice or more than the number of air monitoring stations, i.e.: the air monitoring station can be provided with two or more gas sensing units 100, and when one of the gas sensing units 100 is out of control and the accuracy is reduced, the other gas sensing unit in the station can be started, and the air monitoring station can be used in heavy industry and other areas with serious pollution.
S2: the gas sensing unit 100 is communicatively connected to the cloud server 200. Preferably, the gas sensing unit 100 and the cloud server 200 can collect communication protocols of WiFi, 4G, 5G and the like to establish communication connection. The gas sensing unit 100 can transmit at least one monitoring signal collected by the gas sensing unit to the cloud server 200 to reflect the pollution level of the target gas,
s3: the cloud server 200 is configured to convert monitoring signals transmitted from the gas sensing units 100 in the monitoring area into monitoring data,
wherein the gas sensing unit 100 is configured to include at least two sensors integrated on the same substrate so that the gas sensing unit 100 can detect a target gas in an array manner.
Preferably, the gas sensing unit 100 is configured to: the sensor is integrated in an array of at least two different sensor pixels.
It should be noted that the above-described embodiments are exemplary and that a person skilled in the art, in light of the present disclosure, may devise various solutions which fall within the scope of the present disclosure. It should be understood by those skilled in the art that the present description and drawings are illustrative and not limiting to the claims. The scope of the invention is defined by the claims and their equivalents.
Claims (7)
1. An atmospheric meshing monitoring system utilizing an array of gas sensors, comprising:
the number of the gas sensing units (100) corresponds to the number of the air monitoring stations arranged in a grid mode in the monitoring area, and can send at least one monitoring signal which is collected by the gas sensing units and can reflect the pollution degree of target gas to the cloud server (200),
the cloud server (200) converts the monitoring signals sent by the gas sensing units (100) in the monitoring area into monitoring data,
it is characterized in that the method comprises the steps of,
the gas sensing unit (100) comprises at least two sensors integrated on the same substrate, so that the gas sensing unit (100) can detect the target gas in an array manner; the gas sensing unit (100) integrates the sensor in an array of at least two different sensing pixels;
wherein after the gas contacts the array of gas sensors, each sensor in the array has a different response to the same gas atmosphere, the responses of the different sensors in the array form a response profile of the array to the gas atmosphere,
the gas sensing unit (100) is provided with a gas drying unit (600) in front,
wherein, the gas drying unit (600) is internally provided with at least two drying chambers (600 a) which can be communicated with the gas sensing unit (100) and are connected in parallel, the detected air flows back to blow the drying agent,
the gas path switching device (500) can guide the target gas to be measured into one drying chamber from the other drying chamber, wherein the single drying chamber (600 a) dries the air to be detected in a mode that the variation of the humidity of the drying agent in the drying chamber (600 a) after one service time is minimized, and the detected air is returned to the nth drying chamber in the service process of the nth-1 drying chamber;
the processor (400) generates a switching instruction to cause the gas path switching device (500) to switch the next drying chamber (600 a) when the humidity of the target gas is not within the preset range of the gas sensing unit (100) after the target gas is dried through the drying chamber (600 a).
2. The monitoring system of claim 1, wherein the sensor is a metal oxide gas sensor.
3. The monitoring system according to claim 1, wherein the cloud server (200) is capable of comparing data to be calibrated acquired by the gas sensing unit (100) over a period of time with standard data of a portable gas analyzer (300) to be able to generate a calibration model of the monitoring system.
4. A monitoring system according to claim 3, characterized in that the at least two drying chambers (600 a) are each provided with a heater (600 b) so that the drying unit (600) can continuously dehumidify the target gas in such a way that the at least two drying chambers (600 a) are spaced apart.
5. The monitoring system according to claim 4, wherein the at least two parallel drying chambers (600 a) are each communicable with a gas path switching device (500), and the gas path switching device (500) is capable of introducing the target gas to be measured from one of the drying chambers to the other drying chamber in a case where a processor (400) sends a switching instruction generated based on the humidity change amount of the target gas before and after drying to the gas path switching device (500).
6. The monitoring system according to claim 5, wherein the processor (400) sends a switching instruction to the gas circuit switching device (500) in such a way that the humidity of the target gas after drying via the drying chamber (600 a) can be within a preset range of the gas sensing unit (100).
7. An atmospheric meshing monitoring method of a gas sensor array, comprising:
gas sensing units (100) corresponding to the number of air monitoring stations in a grid arrangement within a monitoring area are arranged,
the gas sensing unit (100) is in communication connection with the cloud server (200) so that the gas sensing unit (100) can send at least one monitoring signal which is acquired by the gas sensing unit and can reflect the pollution degree of target gas to the cloud server (200),
the cloud server (200) is configured to be able to convert the monitoring signals sent by the gas sensing units (100) within the monitoring area into monitoring data,
it is characterized in that the method comprises the steps of,
-configuring the gas sensing unit (100) to comprise at least two sensors integrated in the same substrate, such that the gas sensing unit (100) is capable of detecting the target gas in an array; -configuring the gas sensing unit (100) to: integrating the sensor in an array of at least two different sensing pixels;
wherein after the gas contacts the array of gas sensors, each sensor in the array has a different response to the same gas atmosphere, the responses of the different sensors in the array form a response profile of the array to the gas atmosphere,
the gas sensing unit (100) is provided with a gas drying unit (600) in front,
wherein, the gas drying unit (600) is internally provided with at least two drying chambers (600 a) which can be communicated with the gas sensing unit (100) and are connected in parallel, the detected air flows back to blow the drying agent,
the gas path switching device (500) can guide the target gas to be measured into one drying chamber from the other drying chamber, wherein the single drying chamber (600 a) dries the air to be detected in a mode that the variation of the humidity of the drying agent in the drying chamber (600 a) after one service time is minimized, and the detected air is returned to the nth drying chamber in the service process of the nth-1 drying chamber;
the processor (400) generates a switching instruction to cause the gas path switching device (500) to switch the next drying chamber (600 a) when the humidity of the target gas is not within the preset range of the gas sensing unit (100) after the target gas is dried through the drying chamber (600 a).
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