CN113588883B - Ambient air quality monitoring device for automatic calibration - Google Patents
Ambient air quality monitoring device for automatic calibration Download PDFInfo
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- CN113588883B CN113588883B CN202110883105.6A CN202110883105A CN113588883B CN 113588883 B CN113588883 B CN 113588883B CN 202110883105 A CN202110883105 A CN 202110883105A CN 113588883 B CN113588883 B CN 113588883B
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses an environmental air quality monitoring device, which comprises: the monitoring sub-device is used for monitoring the air quality and comprises a meteorological sensor, a gas sensor unit and a dynamic heating and dehumidifying sampling unit; the automatic calibration sub-device is used for carrying out automatic calibration and comprises a flow control distribution unit, a first path of humidity control unit, a second path of target gas concentration control unit, a third path of dry air control unit and a calibration unit; by adopting the monitoring device provided by the embodiment of the application, the flow control distribution unit is controlled to achieve the aim that the gas sensor unit is accurately and automatically calibrated on the humidity or the target gas target concentration through the dynamic adjustment configuration, and finally the accuracy of automatic calibration is improved.
Description
Technical Field
The invention relates to the technical field of computers, in particular to an ambient air quality monitoring device capable of conducting automatic calibration.
Background
A miniature environmental air quality monitoring system is mainly used for atmospheric pollution prevention and control management grids, large-range and high-density distribution, an air quality monitoring micro-station based on a sensor technology is built, dynamic changes and trends of main pollutants in each grid are monitored in real time, the current pollution situation is objectively and truly reflected, abnormal pollution emission behaviors are rapidly captured, and automatic alarming is achieved. The gas detection of the micro-station adopts various Sensors (SO) 2 、NO 2 、CO、O 3 、NH 3 、H 2 S, TVOC and the like), and the gas concentration result data is monitored in real time through diffusion type or pumping type sampling and uploaded through wired communication or a wireless network.
The existing miniature environmental air quality monitoring system in the current market has the following problems: the existing miniature environmental air quality monitoring system runs for a long time on site, has the problems of zero drift, low accuracy, poor stability and the like due to environmental influence, and particularly, the measurement state of a sensor is directly influenced by the change of environmental humidity to cause data measurement deviation. In addition, in the process of operating and quality controlling equipment, the remote calibration operation is only carried out by comparing portable mobile equipment or national standard equipment, the quality control means is single, and due to the difference of the measurement principle, the traceability quality control transmission effect is poor, the calibration program is complex, and the operation and maintenance are inconvenient.
Disclosure of Invention
The embodiment of the application provides an ambient air quality monitoring device for automatic calibration. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
The embodiment of the application provides an environmental air quality monitoring device who carries out automatic calibration, the device includes:
the monitoring sub-device is used for monitoring the air quality and comprises a meteorological sensor and a gas sensor unit;
the automatic calibration sub-device is used for carrying out automatic calibration and comprises a flow control distribution unit, a first path of humidity control unit, a second path of target gas concentration control unit, a third path of dry air control unit and a calibration unit;
the flow control distribution unit is used for controlling the flow ratio among the wet air in the first path of humidity control unit, the target gas in the second path of target gas concentration control unit and the dry air in the third path of dry air control unit to be a preset flow ratio, and the flow control distribution unit is connected in series with the first path of humidity control unit, the second path of target gas concentration control unit and the third path of dry air control unit which are connected in parallel;
the control unit is used for controlling the calibration unit to switch when judging that the current condition meets a preset condition, and enabling the gas meeting the preset condition to pass through the gas sensor unit so as to automatically calibrate various pollutant gases in the gas sensor unit according to preset calibration parameters, wherein the preset condition comprises a humidity preset condition and a target gas target concentration preset condition.
In one embodiment, the apparatus further comprises:
a preset condition configuration unit, configured to configure the humidity preset condition, where the humidity preset condition includes: a real-time humidity difference between the first real-time humidity value and the second real-time humidity value on the humidity parameter is less than or equal to a first predetermined threshold, and/or,
the target gas concentration presetting condition is configured and comprises the following steps: and the real-time concentration difference value between the first real-time concentration value and the second real-time concentration value on the concentration parameter of the target gas is less than or equal to a second preset threshold value.
In one embodiment, the monitoring sub-apparatus further comprises:
and the meteorological sensor is used for acquiring the first real-time humidity value in the target area and the target time period.
In one embodiment, the auto-calibration sub-assembly further comprises:
and the humidity sensor is used for detecting the second real-time humidity value in the automatic calibration sub-device and is connected in series with the first path of humidity control unit, the second path of target gas concentration control unit and the third path of dry air control unit which are connected in parallel.
In one embodiment, the auto-calibration sub-assembly further comprises:
and the concentration detection unit is used for detecting the real-time concentration of the target gas, and the concentration detection unit is connected with the first path of humidity control unit, the second path of target gas concentration control unit and the third path of dry air control unit which are connected in parallel in series.
In one embodiment, the apparatus further comprises:
the first receiving unit is configured to receive a first calibration instruction, so as to automatically calibrate the multiple contaminant gases in the gas sensor unit according to the first calibration instruction, where the calibration instruction carries the preset calibration parameters.
In one embodiment, the apparatus further comprises:
and the first calibration period configuration unit is used for configuring a first calibration period so as to automatically calibrate the plurality of pollutant gases in the gas sensor unit according to the preset calibration parameters at every interval of the first calibration period.
In one embodiment, the apparatus further comprises a PM sensor and a calibration parameter configuration unit,
the calibration parameter configuration unit is configured to configure various calibration parameters, so that when the current condition is judged to meet the preset condition, the calibration unit is controlled to switch, the gas meeting the preset condition passes through the PM sensor, and various pollutants in the PM sensor are automatically calibrated according to the preset calibration parameters.
In one embodiment, the apparatus further comprises:
a second receiving unit, configured to receive a second calibration instruction, so as to perform automatic calibration on multiple pollutants in the PM sensor according to the second calibration instruction, where the second calibration instruction carries the preset second calibration parameters.
In one embodiment, the apparatus further comprises:
and the second calibration period configuration unit is used for configuring a second calibration period so as to automatically calibrate a plurality of pollutants in the PM sensor according to the preset calibration parameters at every interval of the second calibration period.
In one embodiment, the automatic calibration sub-device is integrally disposed on the monitoring sub-device, or the automatic calibration sub-device and the monitoring sub-device are separately disposed.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
in the embodiment of the present application, the flow control distribution unit is configured to control a flow ratio between the wet air in the first path of humidity control unit, the target gas in the second path of target gas concentration control unit, and the dry air in the third path of dry air control unit to be a preset flow ratio; the control unit is used for controlling the calibration unit to be switched to the inlet end of the dynamic heating and dehumidifying sampling unit when judging that the current condition meets the preset condition, and enabling the gas meeting the preset condition to pass through the gas sensor unit, so that various pollutant gases in the gas sensor unit can be automatically calibrated according to various preset calibration parameters; by adopting the embodiment of the application, the flow control distribution unit is controlled to achieve the aim of accurately and automatically calibrating the gas sensor unit on the humidity or the target concentration of the target gas through the dynamic adjustment configuration, so that the problem that the zero point of the gas sensor is influenced by the humidity change or the target gas is effectively avoided, and the accuracy of automatic calibration is finally improved. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural diagram of an ambient air quality monitoring device in a specific application scenario of an embodiment of the present application.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Alternative embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an ambient air quality monitoring device in a specific application scenario according to an embodiment of the present application.
As shown in fig. 1, an ambient air quality monitoring device provided in an embodiment of the present application includes:
the monitoring sub-device is used for monitoring the air quality and comprises a meteorological sensor, a gas sensor unit and a dynamic heating, dehumidifying and sampling unit;
the automatic calibration sub-device is used for automatically calibrating a zero point and comprises a flow control distribution unit, a first path of humidity control unit, a second path of target gas concentration control unit, a third path of dry air control unit and a calibration unit;
the flow control distribution unit is used for controlling the flow proportion among the wet air in the first path of humidity control unit, the target gas in the second path of target gas concentration control unit and the dry air in the third path of dry air control unit to be a preset flow proportion, and the flow control distribution unit is connected with the first path of humidity control unit, the second path of target gas concentration control unit and the third path of dry air control unit which are connected in parallel in series;
and the control unit is used for controlling the calibration unit to be switched to the inlet end of the dynamic heating and dehumidifying sampling unit when judging that the current condition is in accordance with the preset condition, and enabling the gas in accordance with the preset condition to pass through the gas sensor unit so as to automatically calibrate various pollutant gases in the gas sensor unit according to preset calibration parameters, wherein the preset condition comprises a humidity preset condition and a target gas target concentration preset condition.
In this embodiment of the present application, the preset calibration parameters include not only calibration parameters for performing automatic zero calibration, but also calibration parameters for performing automatic calibration on preset target gas parameters with different linear concentrations, and the calibration parameters are all conventional calibration parameters, which is not described herein again.
In the embodiment of the present application, the preset flow ratio may be configured according to requirements of different application scenarios, and the target gas is not specifically limited, for example, isobutylene. Through the monitoring device as shown in fig. 1, automatic calibration of various pollutant gases in the gas sensor unit can be realized, wherein the various pollutant gases can be sulfur dioxide and also can be nitrogen dioxide.
For example, the three parallel-connected units shown in fig. 1 are a first humidity control unit, a second target gas concentration control unit, and a third dry air control unit, respectively; the humidity control unit is used for controlling the humidity of the air to be in a first path, the target gas concentration control unit is used for controlling the concentration of the target gas in a second path, and the dry air control unit is used for controlling the concentration of the target gas in a third path.
In a specific application scenario, the target is formulated as: 300ml/min,200ppb isobutene, required 90% R.H, at an original concentration of 5ppm, the preset flow ratios are specifically set as follows:
1) The first path of wet air is responsible for controlling the humidity, the wet air is taken out by a dry air entering a gas washing bottle, and the required flow is as follows: 300ml/min × 90% =270ml/min;
2) The second path of gas is responsible for controlling the concentration, and the required flow is as follows:
300ml/min×200ppb/5ppm＝12ml/min；
3) The third path of required dry air flow is as follows: 300-270-12=18ml/min;
therefore, the preset flow proportion among the three paths is as follows: 270:12:18.
the above is merely an example, and with the similar method as described above, if the other humidity is different, 200ppb isopropene, 300ml/min, the flow rates of the respective paths as shown in fig. 1 are as follows:
| preset humidity | Flow rate required for the first path | Flow rate required by the second path | Third path required flow |
| 20％R.H | 60ml/min | 12ml/min | 228ml/min |
| 50％R.H | 150ml/min | 12ml/min | 138ml/min |
| 80％R.H | 240ml/min | 12ml/min | 48ml/min |
| 90％R.H | 270ml/min | 12ml/min | 18ml/min |
The miniature ambient air quality monitoring device provided by the embodiment of the application not only can perform zero automatic calibration, but also can perform automatic linear calibration of target gases with different concentrations, thereby greatly improving the applicable calibration range of the monitoring device.
In a possible implementation manner, the monitoring apparatus provided in the embodiment of the present application further includes:
a preset condition configuration unit, configured to configure the humidity preset condition, where the humidity preset condition includes: the difference in humidity between the first measured humidity value and the second measured humidity value on the humidity parameter is less than or equal to a first predetermined threshold value, and/or,
the target gas concentration presetting conditions are configured, and comprise: a concentration difference between the first and second measured concentration values on the concentration parameter of the target gas is smaller than or equal to a second preset threshold.
In the embodiment of the present application, the first preset threshold and the second preset threshold are not specifically limited, and may be configured according to requirements of an actual application scenario, and are not described herein again.
In a possible implementation manner, the monitoring apparatus provided in the embodiment of the present application further includes:
the meteorological sensor is used for acquiring a first real-time humidity value of a target area within a target time period; thus, the first real-time humidity value of the external environment where the monitoring device is located can be obtained through the meteorological sensor, and the flow ratio between the wet air in the first path of humidity control unit and the dry air in the third path of dry air control unit is adjusted through the flow control distribution unit by taking the first real-time humidity value as a reference, so that the second real-time humidity value measured by the humidity sensor and the first real-time humidity value measured by the meteorological sensor, which are finally shown in fig. 1, approach to zero infinitely.
In a possible implementation manner, the automatic calibration sub-apparatus provided in an embodiment of the present application further includes:
and the humidity sensor is used for detecting a second real-time humidity value in the automatic calibration sub-device and is connected with the first path of humidity control unit, the second path of target gas concentration control unit and the third path of dry air control unit which are connected in parallel in series.
In a possible implementation manner, the automatic calibration sub-apparatus provided in the embodiment of the present application further includes:
the concentration detection unit is used for detecting the real-time concentration of target gas, and the concentration detection unit is connected in series with the first path of humidity control unit, the second path of target gas concentration control unit and the third path of dry air control unit which are connected in parallel; whether the target gas reaches the preset concentration or not can be detected in real time through the concentration detection unit.
In a possible implementation manner, the monitoring apparatus provided in the embodiment of the present application further includes:
and a first receiving unit (not shown in fig. 1) for receiving a first calibration instruction so as to perform automatic calibration on the plurality of pollutant gases in the gas sensor unit according to the first calibration instruction, wherein each preset calibration parameter is carried in the calibration instruction.
In the embodiment of the present application, each calibration parameter is a conventional parameter, and is not described herein again.
In a possible implementation manner, the monitoring apparatus provided in the embodiment of the present application further includes:
a first calibration period configuration unit (not shown in fig. 1) for configuring a first calibration period to facilitate automatic calibration of the plurality of contaminant gases in the gas sensor unit according to preset calibration parameters at intervals of the first calibration period.
In the embodiment of the present application, the first calibration period is not specifically limited, and may be configured according to requirements of different application scenarios, which is not described herein again.
In a possible implementation manner, the monitoring device provided by the embodiment of the application further includes a PM sensor and a calibration parameter configuration unit,
a calibration parameter configuration unit (not shown in fig. 1) configured to configure various calibration parameters, so as to control the calibration unit to switch to the inlet end of the dynamic heating and dehumidifying sampling unit when it is determined that the current condition meets the preset condition, pass the gas meeting the preset condition through the PM sensor, and automatically calibrate various pollutants in the PM sensor according to various preset calibration parameters; like this, the monitoring devices that this application embodiment provided not only can realize the above-mentioned automatic calibration to the multiple pollutant gas in the gas sensor unit, can also realize carrying out the automatic calibration to the multiple pollutant in the PM sensor to the application scope of automatic calibration has been expanded.
In this step, any one of the plurality of pollutants in the PM sensor may be PM 2.5 Or may be PM 10 。
In the embodiment of the present application, each calibration parameter is a conventional parameter, and is not described herein again.
In a possible implementation manner, the monitoring apparatus provided in the embodiment of the present application further includes:
and a second receiving unit (not shown in fig. 1) configured to receive a second calibration instruction, so as to perform automatic calibration on multiple pollutants in the PM sensor according to the second calibration instruction, where the second calibration instruction carries preset calibration parameters.
In the embodiment of the present application, each calibration parameter is a conventional parameter, and is not described herein again.
In a possible implementation manner, the monitoring apparatus provided in the embodiment of the present application further includes:
and a second calibration period configuration unit (not shown in fig. 1) configured to configure a second calibration period so as to automatically calibrate a plurality of contaminants in the PM sensor according to preset calibration parameters every interval of the second calibration period.
In this embodiment, the second calibration period is not specifically limited, and may be configured according to requirements of different application scenarios, which is not described herein again.
In a possible implementation manner, the automatic calibration sub-device is integrally disposed on the monitoring sub-device, so that the volume of the micro ambient air quality monitoring device with the automatic calibration function provided by the embodiment of the application can be greatly reduced, and the portability of the device is improved.
In one possible implementation, the automatic calibration sub-assembly and the monitoring sub-assembly are separately disposed; in this way, disassembly and maintenance of the various sub-assemblies is facilitated.
The functions of the various units and sensors of fig. 1 described above are explained as follows:
an adsorption drying filtering unit: high-performance adsorbents such as activated carbon, alumina, silica gel and the like are adopted to completely adsorb pollutants in the ambient air; and (3) filtering the particles by adopting a high-precision filtering device such as a ceramic filter element, a stainless steel filter element and the like.
A flow rate distribution control unit: the method provides environmental air collection power, such as a sampling pump and the like, and dynamically distributes and adjusts the flow of the three paths of gases (the three paths of gases are respectively a first path of humidity control unit, a second path of target gas concentration control unit and a third path of dry air control unit), such as a flow sensor, a mass flow meter and the like.
A humidity sensor unit: and measuring the humidity of the moisture mixed by the target gas, the dry air and the wet air in real time, and feeding back a second real-time humidity of the mixed moisture to a control unit, such as a dew point meter and the like.
A concentration detection unit: and detecting the real-time concentration of the target gas in the second path of target gas concentration control unit in real time.
A calibration unit: and receiving a control unit command, and switching the moisture output flow direction, such as a solenoid valve and the like.
And in the process of automatic zero calibration, the calibration unit is used for switching the output flow direction of the calibrated moisture according to the received switching instruction of the control unit.
One situation is: under the condition that the absolute value of the real-time humidity difference value between a first real-time humidity value detected by a meteorological sensor and a second real-time humidity value detected by a humidity sensor in the automatic calibration sub-device is equal to or smaller than a first preset threshold value, the calibration unit is controlled to switch to the inlet end of the dynamic heating dehumidification sampling unit, and therefore automatic humidity calibration is carried out.
The other situation is as follows: under the condition that the absolute value of the real-time humidity difference value between a first real-time humidity value detected by the meteorological sensor and a second real-time humidity value detected by the humidity sensor in the automatic calibration sub-device is larger than a first preset threshold value, the calibration unit is controlled to switch to the outlet end of the emptying component.
In the automatic linear calibration process of target gases with different concentrations, when the concentration detection unit detects that the second path of target gas reaches the target concentration, the calibration unit is controlled to switch to the inlet end of the dynamic heating and dehumidifying sampling unit, and thus, the concentration is automatically calibrated; otherwise, the calibration unit is controlled to be switched and is switched to the outlet end of the emptying component.
A control unit: for automatic zero calibration and linear concentration calibration of the target gas.
The process of the control unit controlling the automatic zero calibration is specifically as follows:
the method comprises the steps that a second real-time humidity value (a mixed humidity real-time value obtained by mixing dry air and wet air) detected by a humidity sensor in an automatic calibration sub-device is compared with a first real-time humidity value (a real-time humidity value of external environment air) detected by an meteorological sensor in real time, and the gas flow ratio of the dry air and the wet air in a flow distribution control unit is adjusted rapidly and dynamically until the humidity of the mixed humidity is consistent with the humidity of the external environment air; and further controlling a calibration unit to switch the mixed gas meeting the humidity requirement from the emptying state to the inlet of the dynamic heating and dehumidifying sampling unit of the monitoring sub-device. The control unit is connected with the data acquisition, processing and transmission unit of the monitoring sub-device, can configure a calibration period in a user-defined mode, and marks the calibration state of the miniature environmental air quality monitoring device.
The control unit controls the process of performing the linear concentration calibration of the target gas as follows:
detecting the concentration of the second path of target gas in real time through a concentration detection unit until the target gas reaches the target concentration; and further controlling a calibration unit, and switching the target gas meeting the concentration requirement from an emptying state to an inlet of the dynamic heating and dehumidifying sampling unit of the monitoring sub-device. The control unit is connected with the data acquisition, processing and transmission unit of the monitoring sub-device, can configure a calibration period in a user-defined mode, and marks the calibration state of the miniature environmental air quality monitoring device.
After the automatic calibration is completed through the automatic calibration sub-device, the control unit controls the calibration unit to be switched to the inlet end of the dynamic heating and dehumidifying sampling unit, and the PM sensor, the flow control unit of the monitoring sub-device and the gas sensor are sequentially used for measuring and then emptying. Wherein, developments heating dehumidification sampling unit mainly used prevents ambient air moisture condensation, avoids the sensor to measure the deviation that appears. The flow control unit is mainly used for providing power for sampling ambient air, such as a sampling pump and the like. The PM sensor is used for measuring the concentration of particulate matters in ambient air, and the gas sensor is used for measuring the concentration of polluted gas, such as a light scattering method, an electrochemical method, a PID method and the like. The measurement method is a conventional method, and is not described herein again.
Meteorological sensors are used primarily to measure environmental meteorological parameters such as temperature, humidity, and atmospheric pressure.
The constant temperature unit mainly adopts a heating mode or a refrigerating mode, so that the temperature environment of relative temperature in the measuring process is ensured. The constant temperature unit can be a heating rod, a semiconductor refrigeration piece or the like.
The data acquisition, processing and transmission unit is mainly used for acquiring signals of the meteorological sensor, the PM sensor and the gas sensor and transmitting measurement data and the running state of the air quality monitoring device in real time.
The electric unit is mainly used for equipment power supply and lightning protection.
In the embodiment of the present application, the flow control distribution unit is configured to control a flow ratio between the wet air in the first path of humidity control unit, the target gas in the second path of target gas concentration control unit, and the dry air in the third path of dry air control unit to be a preset flow ratio; the control unit is used for controlling the calibration unit to be switched to the inlet end of the dynamic heating and dehumidifying sampling unit when judging that the current condition meets the preset condition, and enabling the gas meeting the preset condition to pass through the gas sensor unit so as to automatically calibrate various pollutant gases in the gas sensor unit according to various preset calibration parameters; by adopting the embodiment of the application, the flow control distribution unit is controlled to achieve the aim that the gas sensor unit is accurately and automatically calibrated on the humidity or the target concentration of the target gas through the dynamic adjustment configuration, so that the problem that the zero point of the gas sensor is influenced by the humidity change or the target gas is effectively avoided, and the accuracy of automatic calibration is finally improved.
In addition, the air quality monitoring device in the embodiment of the application is a miniature ambient air quality monitoring device, and can avoid the influence of ambient humidity change or the influence of target gas concentration change by adding automatic calibration according to the ambient environmental conditions of an actual operation site, reduce the zero drift of equipment, realize long-term, stable and accurate operation of the monitoring device, and ensure the accuracy of data monitored by the monitoring device.
Furthermore, the monitoring device provided by the embodiment of the application supports the automatic calibration function of the sensor, automatically and dynamically adjusts the humidity of the mixed gas according to the real-time environmental condition state, and automatically and linearly calibrates the target gases with different concentrations, so that the intelligence of the monitoring device is greatly improved, the automatic calibration process is closer to the actual environmental measurement state, the data deviation caused by the humidity or the target gases is avoided, and the calibration is more accurate.
Furthermore, the monitoring device that this application embodiment provided can set up calibration cycle automatically, reduces the artifical maintenance volume of equipment steady operation, avoids the loaded down with trivial details of on-the-spot calibration, and reduce cost compares in the long-range mode of comparing the calibration of tradition simultaneously, and equipment data quality control quality can obtain further promotion.
Moreover, the monitoring device that this application embodiment provided, signal transmission when supporting the automatic calibration state can real-time identification air quality monitoring device's running state to this air quality monitoring device's calibration effect is evaluateed to in order to carry out iterative optimization to this automatic calibration device according to the calibration effect.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. An automatically calibrated ambient air quality monitoring device, the device comprising:
the monitoring sub-device is used for monitoring the air quality and comprises a meteorological sensor and a gas sensor unit; the meteorological sensor is used for acquiring a first real-time humidity value in a target area and a target time period;
the automatic calibration sub-device is used for carrying out automatic calibration and comprises a flow control distribution unit, a first path of humidity control unit, a second path of target gas concentration control unit, a third path of dry air control unit, a humidity sensor, a concentration detection unit and a calibration unit;
the flow control distribution unit is used for controlling the flow ratio among the wet air in the first path of humidity control unit, the target gas in the second path of target gas concentration control unit and the dry air in the third path of dry air control unit to be a preset flow ratio, and the flow control distribution unit is connected in series with the first path of humidity control unit, the second path of target gas concentration control unit and the third path of dry air control unit which are connected in parallel; the flow control distribution unit acquires the dry air or the wet air by collecting ambient air; the humidity sensor is used for detecting a second real-time humidity value in the automatic calibration sub-device, and the humidity sensor is connected in series with the first path of humidity control unit, the second path of target gas concentration control unit and the third path of dry air control unit which are connected in parallel; the concentration detection unit is used for detecting a second real-time concentration of the target gas, and the concentration detection unit is connected in series with the first path of humidity control unit, the second path of target gas concentration control unit and the third path of dry air control unit which are connected in parallel;
the control unit is used for controlling the calibration unit to switch when judging that the current condition meets a preset condition, and enabling the gas meeting the preset condition to pass through the gas sensor unit so as to automatically calibrate various pollutant gases in the gas sensor unit according to preset calibration parameters, wherein the preset condition comprises a humidity preset condition and a target gas target concentration preset condition;
a preset condition configuration unit, configured to configure the humidity preset condition, where the humidity preset condition includes: a real-time humidity difference between the first real-time humidity value and the second real-time humidity value on a humidity parameter is less than or equal to a first preset threshold, and,
the target gas concentration presetting condition is configured and comprises the following steps: and the real-time concentration difference value between the first real-time concentration value and the second real-time concentration value on the concentration parameter of the target gas is less than or equal to a second preset threshold value.
2. The apparatus of claim 1, further comprising:
the first receiving unit is configured to receive a first calibration instruction, so as to perform automatic calibration on multiple contaminant gases in the gas sensor unit according to the first calibration instruction, where the calibration instruction carries the preset calibration parameters.
3. The apparatus of claim 1, further comprising:
a first calibration period configuration unit, configured to configure a first calibration period, so as to automatically calibrate a plurality of contaminant gases in the gas sensor unit according to the preset calibration parameters at every interval of the first calibration period.
4. The apparatus of claim 1, further comprising a PM sensor and a calibration parameter configuration unit,
the calibration parameter configuration unit is configured to configure the calibration parameters of the pollutants in the PM sensor, so as to control the calibration unit to switch when it is determined that the current condition meets the preset condition, pass the gas meeting the preset condition through the PM sensor, and automatically calibrate the pollutants in the PM sensor according to the preset calibration parameters of the pollutants in the PM sensor.
5. The apparatus of claim 4, further comprising:
a second receiving unit, configured to receive a second calibration instruction, so as to perform automatic calibration on multiple pollutants in the PM sensor according to the second calibration instruction, where the second calibration instruction carries preset calibration parameters of the multiple pollutants in the PM sensor.
6. The apparatus of claim 4, further comprising:
and the second calibration period configuration unit is used for configuring a second calibration period so as to automatically calibrate the multiple pollutants in the PM sensor according to preset calibration parameters of the multiple pollutants in the PM sensor every interval of the second calibration period.
7. The apparatus of claim 1,
the automatic calibration sub-device is integrally arranged on the monitoring sub-device, or,
the automatic calibration sub-device and the monitoring sub-device are arranged in a split mode.
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| CN202110883105.6A CN113588883B (en) | 2021-08-02 | 2021-08-02 | Ambient air quality monitoring device for automatic calibration |
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| CN202110883105.6A CN113588883B (en) | 2021-08-02 | 2021-08-02 | Ambient air quality monitoring device for automatic calibration |
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