CN107402287B - Calibration device and calibration method for air quality detector - Google Patents
Calibration device and calibration method for air quality detector Download PDFInfo
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- CN107402287B CN107402287B CN201710780622.4A CN201710780622A CN107402287B CN 107402287 B CN107402287 B CN 107402287B CN 201710780622 A CN201710780622 A CN 201710780622A CN 107402287 B CN107402287 B CN 107402287B
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- box body
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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
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/007—Arrangements to check the analyser
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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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
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/007—Arrangements to check the analyser
- G01N2033/0072—Arrangements to check the analyser by generating a test gas
Abstract
The invention discloses a calibration device of an air quality detector, which comprises a box body, a standard metering device, a data processing module and a gas charging device, wherein the standard metering device is arranged on the box body; the box body is a sealable box body, and a gas inlet to be detected is arranged on the box body; the standard metering device is arranged in the box body and used for detecting the standard concentration of gas in the box body; the gas filling device is connected with the box body through a gas inlet to be detected and is used for filling gas to be detected into the box body; the data processing module is respectively connected with the standard metering device and the air quality detector and used for receiving and processing real-time data detected by the standard metering device and the air quality detector and calibrating the air quality detector according to the real-time data. According to the invention, the air quality detectors are placed in the test box body, connected with the data processing module and compared with the data measured by the standard metering device, so that the multiple air quality detectors can be calibrated simultaneously.
Description
Technical Field
The invention belongs to the field of checking of detection equipment, and relates to a checking device and a checking method of an air quality detector.
Background
In daily life, news such as PM2.5 explosion and formaldehyde exceeding is often heard, the air pollution degree is reflected by the quality of air, and the quality is judged according to the concentration of pollutants in the air. Air pollution is a complex phenomenon, and the concentration of air pollutants at a particular time and place is influenced by many factors. The indexes of some harmful components in the air can be generally judged by corresponding instruments, such as a PM2.5 measuring instrument, a formaldehyde measuring instrument, a carbon oxide measuring instrument, a nitrogen oxide measuring instrument, a sulfur oxide measuring instrument and the like, which are used for measuring the concentration of harmful gases and the like, related to harmful gases included in national air measurement standards. However, in the use process of these measuring instruments, due to manufacturing factors or human factors, the deviation between the measured value and the actual situation is often large, so a professional calibration device is required to calibrate the measuring instruments, and the calibration device in the prior art can only calibrate a single measuring instrument generally, so the calibration efficiency is low.
Disclosure of Invention
The invention mainly aims to provide a calibration device and a calibration method of an air quality detector, and aims to solve the problems that calibration equipment in the prior art can only calibrate a single measuring instrument and is low in calibration efficiency.
In order to solve the technical problem, the invention provides a calibration device of an air quality detector, which comprises a box body, a standard metering device, a data processing module and a gas filling device, wherein the box body is provided with a plurality of air inlets; the gas detection device comprises a box body, a gas detection device and a gas detection device, wherein the box body is a sealable box body, and a gas inlet to be detected is formed in the box body; the standard metering device is arranged in the box body and used for detecting the standard concentration of gas in the box body; the gas filling device is connected with the box body through a gas inlet to be detected and is used for filling gas to be detected into the box body; the data processing module is respectively connected with the standard metering device and the air quality detector and is used for receiving and processing real-time data detected by the standard metering device and the air quality detector and calibrating the air quality detector according to the real-time data.
Preferably, the gas filling means includes a gas generator for heating formaldehyde and injecting the formaldehyde gas into the case.
Preferably, the gas-filling means comprises a suspended particle generator for generating suspended particles and injecting them into the tank.
Preferably, the box further comprises an air inlet, an air outlet, an air purifying device and an air extracting device, wherein the air inlet is connected with the air purifying device and used for purifying air entering the box, and the air extracting device is connected with the air outlet and used for extracting and exhausting gas in the box.
Preferably, a humidity control device and a temperature control device are further arranged in the box body, and the humidity control device comprises a container filled with saturated salt solution and is used for controlling the humidity in the box body; the temperature control device is used for controlling the temperature in the box body.
Preferably, the gas measuring device further comprises a fan arranged in the box body and used for keeping the gas to be measured in the box body to be uniformly distributed.
Preferably, a shelf for placing the air quality detector is further arranged in the box body; the rack is provided with a recognition device for recognizing the air quality detector to be calibrated.
Preferably, the data processing module is configured to: forming a corresponding concentration curve chart by using the received real-time data detected by the standard metering device and the air quality detector; correcting the concentration curve to make the concentration curve tend to be smooth; deriving the real-time numerical value of the concentration curve, acquiring a slope curve of the concentration curve at each moment and comparing the slope curves; outputting a comparison result; and adjusting the current amplification factor, the AD conversion factor, the base number deviation and the reduction weight value of the air quality detector according to the comparison result.
The invention also provides a checking method of the air quality detector, which is characterized by comprising the following steps: arranging a standard metering device in a closable box body; respectively connecting the air quality detection instrument and the standard metering device with a data processing module for calibrating the air quality detection instrument; injecting gas to be measured into the closable box body; comparing the real-time data detected by the standard metering device and the air quality detector; and correcting the air quality detector according to the comparison result.
Preferably, the step of comparing the real-time data detected by the standard metering device and the air quality detector includes: forming a corresponding concentration curve chart by using the received real-time data detected by the standard metering device and the air quality detector; correcting the concentration curve to make the concentration curve tend to be smooth; and (4) deriving the real-time numerical value of the concentration curve, acquiring and comparing the slope curves of the concentration curves at all times, and outputting a comparison result.
According to the invention, the air quality detectors are placed in the test box body, connected with the data processing module and compared with the data measured by the standard metering device, so that the multiple air quality detectors can be calibrated simultaneously.
Drawings
Fig. 1 is a schematic structural diagram of a calibration apparatus of an air quality detector according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method for verifying an air quality sensor according to another embodiment of the present disclosure;
fig. 3 is a flowchart illustrating a method for verifying an air quality detector according to another embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 1 | |
2 | |
| 3 | Data processing module | 4 | Gas charging device |
| 5 | Gas inlet to be measured | 6 | |
| 7 | |
8 | Air purifying device |
| 9 | |
10 | Air extractor |
Detailed Description
In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
The invention provides a calibration device of an air quality detector, which refers to fig. 1 and comprises a box body 1, a standard metering device 2, a data processing module 3 and a gas charging device 4; the box body 1 is a sealable box body 1, and a gas inlet 5 to be detected is arranged on the box body 1; the standard metering device 2 is arranged inside the box body 1 and used for detecting the standard concentration of the gas in the box body 1; the gas filling device 4 is connected with the box body 1 through a gas inlet 5 to be detected and is used for filling gas to be detected into the box body 1; the data processing module 3 is respectively connected with the standard metering device 2 and the air quality detector 6, and is used for receiving and processing real-time data detected by the standard metering device 2 and the air quality detector 6 and calibrating the air quality detector 6 according to the real-time data.
In this embodiment, the preferred volume of box 1 is 1 cubic meter's standard square ya keli box, and one or two panels of box 1 can be opened and be used for getting and putting article, but the contact edge of the openable panel of box 1 theme is provided with the silica gel sealing strip. The standard measuring device 2 includes a fp-30 formaldehyde measuring device, a PM2.5 particle measuring device, a carbon oxide measuring device, a nitrogen oxide measuring device, a sulfur oxide measuring device and other related harmful gas measuring devices included in national air measuring standards, and is used for measuring the concentration of harmful gas. The standard metering device 2 is periodically verified by the national bureau of metering. The gas filling device 4 is connected with the box body 1 and can generate unit standard gas and multi-component standard gas or suspended particles for the detection of the standard metering device 2 and the air quality detector 6. The gas charging means 4 comprise standard gas cylinders. The standard gas cylinder is provided with a flowmeter which can acquire flow data of injected gas, and the gas can be injected into the test box body 1 by opening a valve of the gas cylinder. The invention provides corresponding gas to be measured for the body by arranging the standard gas bottle connected with the box body 1. The box body 1 is also provided with a data line, one end of the data line can be connected with the standard metering device 2 and the air quality detector 6, and the other end of the data line is connected with the data processing module 3 and is used for transmitting data detected by the standard metering device 2 and the air quality detector 6 to the data processing module 3; furthermore, the measurement data can also be transmitted wirelessly to the data processing module 3 by means of wireless communication techniques. The data processing module 3 can process and compare the two sets of acquired data, and then correct the air quality detector 6 according to the comparison result. According to the invention, the air quality detectors 6 are placed in the test box body 1, connected with the data processing module 3 and compared with the data measured by the standard metering device 2, so that the multiple air quality detectors 6 are calibrated simultaneously, and the calibration efficiency is improved.
In the above-mentioned working example, referring to fig. 1, the gas filling device 4 includes a gas generator for heating formaldehyde and injecting the formaldehyde gas into the case 1. The gas generator comprises an electric heating evaporator and a gas pump, the heating evaporator comprises an electric heating body and a bottle body arranged on the electric heating body, the upper end of the bottle body is connected with a gas inlet 5 to be detected of the box body 1, and formaldehyde is arranged at the lower end of the bottle body. The electric heating evaporator is opened to accelerate formaldehyde volatilization, and formaldehyde gas is injected into the box body 1 through the air pump. In this embodiment, through setting up gas generator and accelerated the evaporation of formaldehyde, saved test time.
In the above embodiment, referring to fig. 1, the gas-filling device 4 includes a suspended particle generator for generating suspended particles and injecting into the housing 1. The suspended particle generator comprises a combustion chamber, an air pump, a flow meter, a cigarette lighter, a filter and the like. The cigarette is ignited in the combustion chamber, and the particles formed by the burning of the cigarette are filtered out by a filter to obtain particles with required size, and are introduced into the box body 1 by the air pump. In this embodiment, can pour into the particulate matter of equidimension into box 1 test through setting up the suspended particle generator to satisfy the experimental requirement, improved the precision of test data.
In another embodiment of the present invention, referring to fig. 1, the box body 1 further comprises an air inlet 7, an air outlet 9, an air purifying device 8 and an air extracting device 10, wherein the air inlet 7 is connected with the air purifying device 8 for purifying air entering the box body 1, and the air extracting device 10 is connected with the air outlet 9 for extracting air in the box body 1. To reduce the interference of the gas to be tested already present in the air inside the cabinet 1 before the test, the air drawn into the cabinet 1 may be purified by an air evolution device. The air evolution device comprises an oxidant, a reactant, a drying agent, a particulate electrostatic filter and the like, is used for filtering substances which interfere with the concentration of gas to be measured, such as formaldehyde, carbon oxides, nitrogen oxides, sulfur oxides, water vapor, particulate matters and the like in the air, and can pump the purified air into the box body 1 by opening the air pumping device 10 connected with the exhaust port 9, wherein the air pumping device preferably adopts an air pump. According to the invention, the air purification device 8 is arranged, so that the influence of substances in the air in the box body 1 on experimental data can be reduced, and the test accuracy is improved.
In another embodiment of the present invention, referring to fig. 1, a humidity control device (not labeled) and a temperature control device (not labeled) are further disposed in the box body 1, the humidity control device includes a container filled with saturated salt solution for controlling the humidity in the box body 1, and a steam electric heating generating device may also be disposed for controlling the humidity in the box body; the temperature control device is used to control the temperature inside the case 1. The container filled with saturated salt solution is arranged at the bottom of the box body 1, the upper part of the container is provided with a cover, and the upper part of the container is provided with a vent hole which can prevent other articles in the box body 1 from falling into the container. The humidity inside the cabinet 1 can be maintained at different levels by different salt solutions. The temperature control device comprises electric heating wires and a condenser pipe which are arranged around the box body 1, and a heat insulation material wrapping the box body 1. Through setting up humidity control device and temperature control device, can be with the humiture control in box 1 in required scope, reduce the influence of environmental factor to measuring result.
In the above embodiment, the verification device of the air quality detector further includes a fan disposed in the box 1, and is used to keep the gas to be detected in the box 1 uniformly distributed. The gas filling opening to be measured can make single mouthful of injection, also can follow box 1 even injection all around, relies on the motion between the molecule alone, and gaseous diffusion time is longer relatively, can accelerate the flow of air at box 1 through setting up the fan, makes the gas evenly distributed that awaits measuring in box 1 everywhere, reduces measuring error.
In the above embodiment, the box body 1 is further provided with a shelf for placing the air quality detector 6; the rack is provided with a recognition device for recognizing the air quality detector 6 to be calibrated. The commodity shelf comprises a plurality of cavities and is used for placing the gas air quality detector 6 to be checked, and the cavities are further provided with RFID card readers which can identify electronic tags on the gas air quality detector 6 so as to prevent disorder of the gas air quality detector 6 when the commodity shelf is taken. The bottom of the commodity shelf is connected with the bottom of the box body 1 through a sliding rail, so that the commodity shelf can be conveniently pulled out and pushed into the box body 1.
In the above embodiment, referring to fig. 1, the data processing module 3 is configured to: forming a corresponding concentration curve chart by using the received real-time data detected by the standard metering device 2 and the air quality detector 6; correcting the concentration curve to make the concentration curve tend to be smooth; the real-time numerical value of the concentration curve is derived, and the slope curve of the concentration curve at each moment is obtained and compared; outputting a comparison result; and adjusting the current amplification factor of the air quality detector 6 according to the comparison result.
In this embodiment, the data processing module 3 includes a processing unit and a calibration unit, after receiving the real-time measurement data detected by the standard metering device 2 and the air quality detector 6, the processing unit takes time as a horizontal axis and the real-time measurement data as a vertical axis to form a concentration curve graph, because the measured data may have a value jump after stopping injecting the gas to be measured due to the uneven concentration of the gas to be measured or other factors, the processing unit removes a large fluctuation value in the concentration curve per unit time, so that the concentration curve tends to be smooth, and then the concentration curve is derived to obtain a slope curve of the concentration curve in the whole test time period. The slope curves of the data measured by the standard metering device 2 are compared with the slope curves of the real-time measurement data detected by the air quality detectors 6, and all the slope curves should be kept coincident under ideal conditions. When the air quality detector 6 is damaged, the slope curve of the air quality detector does not coincide with or partially coincides with the slope curve of the standard metering device 2, and finally the air quality detector 6 is calibrated by adjusting one or more parameters of the amplification factor, the AD conversion factor, the radix offset, the reduction of the weighted value and the like of the air quality detector 6.
The invention also provides a checking method of the air quality detector, and referring to fig. 2, the method comprises the following steps:
step S10, arranging a standard metering device in a sealable box body; in the embodiment of the invention, the standard metering device arranged in the closed box body comprises a fp-30 formaldehyde measurer, a PM2.5 particle measurer, a carbon oxide measurer and other related harmful gas measurers in national air measurement standards, and is used for measuring the concentrations of different gases to be measured and particulate matters, and the standard metering device needs to be checked and passed by a metering mechanism.
Step S20, connecting the air quality detection instrument and the standard metering device with a data processing module for calibrating the air quality detection instrument respectively; in this embodiment, a data processing module may be disposed outside the box, and the data processing module is connected to the air quality detector and the standard metering device in a wired or wireless manner, and is configured to process concentration values of the gas to be detected, which are detected by the air quality detector and the standard metering device, at different concentrations of the gas to be detected.
Step S30, injecting gas to be measured into the sealable box body; the gas concentration can be continuously improved by injecting gas to be measured into the box body through devices such as a gas pump and the like.
Step S40, comparing the real-time data detected by the standard metering device and the air quality detector; for example, a data processing device may be provided to compare the data detected by the standard metering device with the real-time data detected by the air quality detector, and obtain a comparison result, for example, a difference between the real-time data detected by the air quality detector and the data detected by the standard metering device.
And step S50, correcting the air quality detector according to the comparison result. And adjusting parameters of the air quality detector according to the difference value to enable the measurement data of the experimental group to be close to the measurement data of the control group.
Referring to fig. 3, in a preferred embodiment, step S40 includes:
step S41, forming a corresponding concentration curve chart by using the received real-time data detected by the standard metering device and the air quality detector; the processing unit takes time as a horizontal axis and takes real-time measurement data as a vertical axis after acquiring the measurement data to form a concentration curve graph.
Step S42, correcting the concentration curve to make the concentration curve tend to be smooth; because the measured data may jump after stopping injecting the gas to be measured due to the concentration unevenness of the gas to be measured or other factors, the processing unit removes a larger fluctuation value in the concentration curve within a unit time.
And step S43, deriving the real-time numerical value of the concentration curve, acquiring and comparing the slope curves of the concentration curves at all times, and outputting a comparison result. And comparing the slope curve of the data obtained by the standard metering device and the slope curve of the real-time measurement data detected by each air quality detector, wherein all the slope curves are kept coincident under an ideal condition. In the case of damage to the air quality detector, the slope curve does not coincide with the slope curve of the standard metering device, or partially coincides, so that deviations of the air quality detector from the standard metering device over different periods of time are obtained.
In the embodiment of the present invention, the verification method of the air quality detector of the present invention can be implemented by using the verification apparatus of the air quality detector shown in fig. 1, and the structure and the working principle of the verification apparatus of the air quality detector refer to the description of the foregoing embodiment, which is not described herein again.
The technical problems, technical solutions and advantages of the present invention have been described in detail with reference to the above embodiments, and it should be understood that the above embodiments are merely exemplary and not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A calibration device of an air quality detector is characterized by comprising a box body, a standard metering device, a data processing module and a gas filling device; wherein the content of the first and second substances,
the box body is a sealable box body, a gas inlet to be detected is arranged on the box body, and a storage rack for placing an air quality detector is also arranged in the box body; the rack is provided with a recognition device for recognizing the air quality detector to be calibrated;
the standard metering device is arranged in the box body and used for detecting the standard concentration of gas in the box body;
the gas filling device is connected with the box body through a gas inlet to be detected and is used for filling gas to be detected into the box body;
the data processing module is respectively connected with the standard metering device and the air quality detector and is used for receiving and processing real-time data detected by the standard metering device and the air quality detector and calibrating the air quality detector according to the real-time data, and the data processing module is used for:
forming a corresponding concentration curve chart by using the received real-time data detected by the standard metering device and the air quality detector;
correcting the concentration curve to make the concentration curve tend to be smooth;
the real-time numerical value of the concentration curve is derived, the slope curve of the concentration curve at each moment is obtained, and comparison is carried out to output a comparison result;
and adjusting the current amplification factor, the AD conversion factor, the base number deviation and the reduction weight value of the air quality detector according to the comparison result.
2. The calibration device of an air quality detector according to claim 1, wherein said gas filling means comprises a gas generator for heating formaldehyde and injecting formaldehyde gas into said case.
3. The calibration device of an air quality detector according to claim 1, wherein the gas charging device includes a suspended particle generator for generating suspended particles and injecting the suspended particles into the housing.
4. The verification apparatus for an air quality detector according to any one of claims 1 to 3, wherein the box further comprises an air inlet, an air outlet, an air purification device, and an air extraction device, the air inlet being connected to the air purification device for purifying air entering the box, and the air extraction device being connected to the air outlet for extracting air from the box.
5. The verification device of the air quality detector according to claim 4, wherein a humidity control device and a temperature control device are further arranged in the box body, and the humidity control device comprises a container filled with saturated salt solution and used for controlling the humidity in the box body; the temperature control device is used for controlling the temperature in the box body.
6. The calibrating apparatus for an air quality measuring instrument according to claim 5, further comprising a fan disposed within said housing for maintaining a uniform distribution of the gas to be measured within the housing.
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| CN108333087A (en) * | 2018-02-27 | 2018-07-27 | 法雷奥汽车空调湖北有限公司 | Automobile-used PM2.5 sensor accuracies adjusting apparatus and control logic |
| CN109387471A (en) * | 2018-06-04 | 2019-02-26 | 广东美的环境电器制造有限公司 | Modification method, correcting device and the update the system of air purifier |
| CN110967446B (en) * | 2018-09-28 | 2021-10-08 | 比亚迪半导体股份有限公司 | Parameter targeting method and device, storage medium and electronic equipment |
| CN109580877A (en) * | 2018-10-29 | 2019-04-05 | 北京英视睿达科技有限公司 | Guarantee the method and device of enviromental monitoring equipment monitoring data comparativity |
| CN110186821A (en) * | 2019-05-13 | 2019-08-30 | 天津大学 | A kind of Performance Test System of indoor air quality sensor under different humidity |
| CN110057980A (en) * | 2019-05-16 | 2019-07-26 | 广州长德环境研究院有限公司 | A kind of on-line gas analysis instrument state automatic monitoring device |
| CN111864232B (en) * | 2020-08-03 | 2021-12-21 | 上海重塑能源科技有限公司 | Gas purity detection method and hydrogen purity detection device of hydrogen supply system |
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| US9291608B2 (en) * | 2013-03-13 | 2016-03-22 | Aclima Inc. | Calibration method for distributed sensor system |
| CN104807148A (en) * | 2015-04-16 | 2015-07-29 | 珠海汉朗环境科技有限公司 | Device and method for switching zero calibration and real-time detection of air sensor |
| CN105424074B (en) * | 2015-12-30 | 2018-01-02 | 珠海格力电器股份有限公司 | A kind of sensor calibrating system and its control method, device |
| CN105911222A (en) * | 2016-04-18 | 2016-08-31 | 中国石油化工股份有限公司 | Metrological verification device for ammonia gas detector and metrological verification method thereof |
| CN106053551A (en) * | 2016-07-31 | 2016-10-26 | 河北工业大学 | Multi-channel multi-type sensor capability test system |
| CN106596871A (en) * | 2017-03-02 | 2017-04-26 | 中国家用电器研究院 | Method and device for detecting performance reliability of air quality monitor |
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