CN115201425A - Calibration system and calibration method of air quality sensor - Google Patents
Calibration system and calibration method of air quality sensor Download PDFInfo
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- CN115201425A CN115201425A CN202210914840.3A CN202210914840A CN115201425A CN 115201425 A CN115201425 A CN 115201425A CN 202210914840 A CN202210914840 A CN 202210914840A CN 115201425 A CN115201425 A CN 115201425A
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention relates to the technical field of air quality sensor calibration, and discloses a calibration system of an air quality sensor, which comprises an information centralized processing module, standard data equipment, a communication bus, a sensor read-write module, a calibration tooling plate, a pollutant generator and a generator control circuit, wherein the information centralized processing module is used for processing information of the air quality sensor; the information centralized processing module is used for reading data of the standard equipment, reading data of the sensor, calculating parameters of the sensor and sending calibration parameters to the sensor or the calibration tooling plate; the calibration system of the air quality detection sensor suitable for mass production and the electric control part of the whole system mainly complete the functions of communication, calculation, acquisition and the like, further intelligently complete the additional functions of automatic control of electrical appliances in the calibration cabin, selection of abnormal devices and the like, and can greatly reduce the labor cost. The system can simultaneously collect and calibrate thousands or even tens of thousands of sensors, and can meet the daily production and shipment requirements of factories; the invention also provides a calibration method.
Description
Technical Field
The invention relates to the technical field of air quality sensor calibration, in particular to a calibration system and a calibration method of an air quality sensor.
Background
In some present domestic air purification equipment, for more intelligent, also can let purifying effect more visual, often can increase the sensor that air quality detected in equipment, for example PM2.5 sensor, formaldehyde sensor, carbon dioxide sensor etc.. Meanwhile, products such as air quality detectors and sensors for air quality detection are also available.
However, the data of these sensors often need to be calibrated with professional instruments in a factory to obtain accurate data, in some existing factories, air with corresponding pollution concentration is manufactured in a box during calibration, a calibration device is placed, the sensors are placed in the box during calibration, the coefficients of the sensors are manually adjusted according to the data to calibrate the sensors, the sensors are advanced, serial ports of a computer are used for simultaneously accessing several sensors, and the coefficients of the sensors are manually adjusted by comparing the data.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the calibration system of the air quality sensor, which has the advantages of greatly improving the calibration efficiency, reducing the labor cost and the probability of manual error and solves the problems of very low efficiency of the calibration process and high probability of manual error.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a calibration system of an air quality sensor comprises an information centralized processing module, standard data equipment, a communication bus, a sensor read-write module, a calibration tooling plate, a pollutant generator and a generator control circuit;
the information centralized processing module is used for reading standard equipment data, reading sensor data, calculating sensor parameters, sending calibration parameters to the sensor or the calibration tooling plate, controlling a pollutant generator, controlling an electric appliance in a calibration cabin, reading the data of the calibrated sensor, screening and analyzing the data, and storing all the read data and parameters before and after calibration;
the standard data equipment is used for testing environmental data in the calibration cabin;
the communication bus is used for connecting communication among all the modules;
the pollutant generator is used for producing pollutants with certain concentration;
the generator control circuit is used for controlling the concentration of the pollutants;
the calibration tooling plate is used for converting the communication modes of the sensor and the bus, repacking the data and displaying the data.
Preferably, the information centralized processing module can be arranged in the sensor, can be combined with the calibration tooling plate into a whole, can be an independent circuit module, can be an independent functional product, and can also be a computer, and a form of combining a tablet device with an external circuit.
Preferably, the standard data device may have one or more data output modes, such as a serial port, a voltage value, a TCP/IP, and the like, and when the communication mode does not match the communication mode required by the information centralized processing module, a standard device communication conversion module is required to be added, and the standard device communication conversion module is configured to convert the data of the standard device into a communication mode that can be read and identified by the information centralized acquisition module.
Preferably, the calibration tooling plate can be connected with the sensors in a one-to-one manner or in a one-to-many manner.
Preferably, the calibration tooling plate has a unique ID in the system.
Preferably, the calibration tooling plate can read the sensor data in serial polling or parallel simultaneous manner.
Preferably, the centralized information processing module automatically or remotely controls the operation of the pollutant generator.
Preferably, the pollutant generator may be a carbon dioxide emitter, a formaldehyde emitter or a PM2.5 smoke generator.
Preferably, the hardware form of the communication interface can also be various interface forms, such as an aviation plug, a multi-pin connector with a lock, a multi-pin connector without a lock, an audio plug, an antenna for wireless mode and the like.
Preferably, the communication bus can be an RS-485 bus, an RS-232 bus, a serial port, a parallel port, RS-485, PWM, IIC, SPI, SWD and other wired communication modes, and WIFI, bluetooth,2.4G wireless, lora and other wireless communication modes.
Preferably, the method further comprises the following steps:
s1: reading sensor data and confirming the state of the sensor;
s2: controlling the pollutant generator to work, and manufacturing a calibration environment;
s3: reading data of the pollutant standard data device and data of each sensor;
s4: calculating calibration parameters of each sensor through data and a built-in algorithm;
s5: accessing the calibration parameters into corresponding sensors;
s6: and reading sensor data, confirming the state of the sensor, and automatically finishing the selection of the sensor with larger data error and outputting an abnormal sensor report.
(III) advantageous effects
Compared with the prior art, the invention provides a calibration system of an air quality sensor, which has the following beneficial effects:
the calibration system of the air quality sensor is suitable for mass production, and the electric control part of the whole system mainly completes functions of communication, calculation, acquisition and the like, further intelligently completes additional functions of automatic control of electrical appliances in a calibration cabin, selection of abnormal devices and the like, and can greatly reduce labor cost. The system can simultaneously collect and calibrate thousands or even tens of thousands of sensors, and can meet the daily production and shipment requirements of factories.
Drawings
FIG. 1 is a diagram of a system for calibrating a carbon dioxide sensor according to the present invention;
FIG. 2 is a flow chart of calibrating a carbon dioxide sensor according to the present invention;
FIG. 3 is a system diagram for calibrating a formaldehyde sensor according to the present invention;
FIG. 4 is a flow chart of the present invention for calibrating a formaldehyde sensor;
FIG. 5 is a system diagram for calibrating a PM2.5 sensor in accordance with the present invention;
FIG. 6 is a flow chart of calibrating a PM2.5 sensor according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example one
A calibration system of an air quality sensor comprises an information centralized processing module, standard data equipment, a communication bus, a sensor read-write module, a calibration tooling plate, a pollutant generator and a generator control circuit;
the information centralized processing module is used for reading data of standard equipment, reading data of a sensor, calculating parameters of the sensor, sending calibration parameters to the sensor or a calibration tooling plate, controlling a pollutant generator, controlling an electric appliance in a calibration cabin, reading data of the calibrated sensor, screening and analyzing the data, and storing all the read data and parameters before and after calibration;
the standard data equipment is used for testing environmental data in the calibration cabin;
the communication bus is used for connecting communication among all the modules;
the pollutant generator is used for producing pollutants with certain concentration;
the generator control circuit is used for controlling the concentration of the pollutants;
and the calibration tooling plate is used for converting the communication modes of the sensor and the bus, repacking the data and displaying the data.
Referring to fig. 1-2, more specifically, in one embodiment, the calibration system is a calibration system for a carbon dioxide sensor that calculates parameters:
a calibration system of a carbon dioxide sensor, which can communicate with the sensor and calculate parameters by the sensor, comprises a carbon dioxide standard data device, an information centralized processing module and a standard device reading circuit, wherein the information centralized processing module is a central processing circuit part in the calibration system and needs to finish the reading and sending of standard device data, and a bidirectional communication bus can adopt a UART serial port mode for communication;
during calibration, the carbon dioxide generator is manually used for increasing the concentration of carbon dioxide in a calibration room to a certain level, such as 1500ppm, and then a calibration system is started;
the information centralized processing module of the calibration system reads the data of the carbon dioxide standard data equipment through the standard equipment reading circuit, and sends the standard carbon dioxide value to all the carbon dioxide sensors in a broadcasting mode through the communication bus, and the carbon dioxide sensors calculate the calibration coefficient according to the standard carbon dioxide value and the data of the sensors at the moment and write the calibration coefficient into the storage area of the sensors to finish the calibration of the sensors.
After calibration, the sensor will internally calculate the correct carbon dioxide value based on the calibration parameters obtained from the calibration.
If the inter-device communication protocol is an active data transmission mode, the unidirectional bus can also be selected, which can make the system simpler.
Referring to fig. 3-4, more specifically, in one embodiment, the calibration system is a formaldehyde sensor calibration system that automatically controls the environment inside the calibration cabin:
a formaldehyde sensor calibration system capable of automatically controlling and calibrating the environment in a cabin comprises a formaldehyde generator, a formaldehyde generator control circuit, formaldehyde standard data equipment, a central processing circuit and a calibration tooling board, wherein a two-way communication bus can adopt a 232 serial bus.
Each formaldehyde sensor corresponds to a calibration tooling plate, the formaldehyde sensors are in a UART (universal asynchronous receiver/transmitter) two-way communication mode, and the calibration tooling plates are used for communication mode conversion, sensor state display, sensor data display and the like.
Because formaldehyde is harmful to human bodies, the formaldehyde is prevented from being generated manually during calibration, so that the central processing circuit used in the embodiment is a set of circuit modules, data reading, data sending and sensor state judgment need to be completed, and formaldehyde with certain specified concentration needs to be generated through the formaldehyde generator control circuit.
During calibration, the central processing circuit firstly reads data of all formaldehyde sensors, judges whether the sensors are in a calibration state or not according to the numerical values and the flag bits of the data, displays the sensors which are not in the calibration state or have abnormal data through the centralized processing module and light on the calibration tooling plate corresponding to each sensor, reminds workers to replace the abnormal sensors or does not calibrate the sensors at this time, and can also increase the calibration efficiency.
After the formaldehyde sensor is prepared, the calibration cabin door is closed to be well sealed, the central processing circuit starts to generate formaldehyde through the formaldehyde generator control circuit, the formaldehyde concentration in the calibration cabin is gradually increased, the data of the formaldehyde standard equipment are read, and the central processing circuit controls the formaldehyde generation controller to stop generating formaldehyde until the formaldehyde concentration in the calibration cabin reaches a specified value.
And then, the data of the sensors are written into each corresponding formaldehyde sensor through a bidirectional communication bus through communication conversion of a calibration tooling plate, wherein the corresponding mode of the formaldehyde sensors can be the internal ID serial number of each formaldehyde sensor.
After the parameters are written into the sensor, the sensor can internally calculate the correct formaldehyde value according to the calibrated parameters.
And at the moment, the central processing circuit reads the data of the formaldehyde sensor again, judges whether the formaldehyde sensor finishes calibration or not according to the data value and the flag bit, and displays abnormal sensors through the centralized processing module and the light on the calibration tooling plate corresponding to each sensor.
Meanwhile, the nixie tube on the calibration tooling plate corresponding to each sensor can display the data of the sensor at the moment, so that the data of each sensor can be more visually seen by people, and the data of the sensors can be screened.
Referring to fig. 5-6, more specifically, in one embodiment, the calibration system is a PM2.5 sensor calibration system that automatically controls the environment in the calibration cabin to perform bad product selection:
the utility model provides a PM2.5 sensor calibration system that can automatic control calibration under-deck environment, can carry out bad product and select, includes PM2.5 smog generator, PM2.5 smog generator control module, PM2.5 standard data equipment (TSI), standard equipment communication conversion module, information centralized processing module, calibration frock board and frock board conversion module.
Each calibration tooling plate corresponds to 10 PM2.5 sensors, the PM2.5 sensors are in a UART (universal asynchronous receiver/transmitter) two-way communication mode, the calibration tooling plates adopt a serial mode, data reading is carried out on the PM2.5 sensors in turn, secondary packaging processing is carried out on the data, the data are sent to several information acquisition modules, an LCD (liquid crystal display) screen is arranged, and the states of the sensors and the data of the sensors are displayed.
Because the system is relatively complex, the information centralized processing module used in the embodiment is a desktop computer PC, which can complete reading, unpacking, data analysis, calibration data transmission, judgment of the state of the sensor and parameter calculation of the sensor of the calibration tool, control the PM2.5 smoke sounder to manufacture the environment with the particle concentration of the specified particle diameter through the PM2.5 smoke sounder control module, and control electrical appliances in the calibration cabin, such as a purifier, a ceiling fan, an air conditioner and the like.
In the system, a sensor data conversion circuit adopts an RS-485 serial bus, a sensor adopts UART serial port communication, and a PM2.5 standard data equipment (TSI) needs to adopt a TCP/IP communication mode. Because of the complexity of the system, the centralized information processing module of this embodiment uses a PC, and therefore, no matter which communication mode is used, the communication mode needs to be converted into a communication mode that can be used by the PC, and a USB communication mode, so that the system is further provided with a standard device communication conversion module and a tooling plate conversion module.
Before calibration, after all sensors to be calibrated are installed in place, the tool is calibrated, data of all PM2.5 sensors are read, whether the sensors are in a calibration state or not is judged through the numerical values and the mark positions of the data, the sensors which are not in the calibration state or are abnormal in data are displayed through a display screen on the calibration tool, a worker can replace the abnormal sensors according to positions displayed on the screen, the information centralized processing module during calibration can read the states of all the sensors through the calibration tool, the abnormal sensors are prompted again, and meanwhile, the sensors are not calibrated in the calibration, so that the calibration efficiency can be increased.
After the PM2.5 sensor is prepared, the calibration cabin door is closed to be sealed, the information centralized processing module controls the PM2.5 smoke generator to start manufacturing a particulate environment through the PM2.5 smoke generator control module, gradually increases the concentration of PM2.5 in the calibration cabin, reads data of PM2.5 standard equipment, and controls the particle generation controller to stop when the concentration of PM2.5 in the calibration cabin reaches a specified value.
After the information centralized processing module judges that data in the calibration cabin are stable, PM2.5 sensor data are read, data of each sensor are calculated according to data of PM2.5 standard equipment and a built-in algorithm, parameter data of the sensors are sent to a calibration tooling plate where the corresponding sensors are located, the calibration tooling plate serially writes parameters into each corresponding PM2.5 sensor according to the serial number of the sensors, the corresponding mode of the sensors is that each tooling plate has a fixed ID in a calibration system, each sensor is in a fixed sequence in round inquiry of the calibration tooling plate, and a unique sensor can be correspondingly positioned according to the plate number of the calibration tooling plate and the position number of the sensor on the tooling plate.
After the parameters are written into the sensor, the sensor internally calculates the correct PM2.5 value according to the calibrated parameters. The calibration tooling plate can read the PM2.5 value sent by the sensor and display that the worker can manually select the data.
Meanwhile, the information centralized processing module can read PM2.5 sensor data through the calibration tooling plate, then the system judges whether the calibration of the sensor is finished according to the sensor data value and the zone bit, and can automatically screen the sensor data through the centralized processing module by utilizing set criteria and output a screening report.
Because the centralized processing module is a computer, and meanwhile, electrical appliances such as a purifier, an air conditioner and the like are arranged in the calibration cabin, the electrical opening of the calibration cabin can be automatically controlled by utilizing several processing modules, for example, when various particles are needed for calibration, after one particle finishes data reading, the system automatically opens the purifier, so that the concentration of PM2.5 in the calibration room is reduced to a low concentration, and then a second particle occurs; or when the concentration needs to be calibrated at multiple concentration points, after one concentration can be calibrated, the purification is automatically or semi-automatically opened remotely, the concentration is reduced to the second calibrated concentration for calibration, and an intermediate operator does not need to enter a calibration cabin to operate the PM2.5 smoke generator or the purifier.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (11)
1. A calibration system of an air quality sensor is characterized in that: the system comprises an information centralized processing module, standard data equipment, a communication bus, a sensor read-write module, a calibration tooling plate, a pollutant generator and a generator control circuit;
the information centralized processing module is used for reading standard equipment data, reading sensor data, calculating sensor parameters, sending calibration parameters to the sensor or the calibration tooling plate, controlling a pollutant generator, controlling an electric appliance in a calibration cabin, reading the data of the calibrated sensor, screening and analyzing the data, and storing all the read data and parameters before and after calibration;
the standard data equipment is used for testing environmental data in the calibration cabin;
the communication bus is used for connecting communication among the modules;
the pollutant generator is used for producing pollutants with certain concentration;
the generator control circuit is used for controlling the concentration of the pollutants;
and the calibration tooling plate is used for converting the communication modes of the sensor and the bus, repacking the data and displaying the data.
2. The calibration system of the air quality sensor according to claim 1, wherein: the information centralized processing module can be arranged in a sensor, can be combined with a calibration tooling plate into a whole, can be an independent circuit module, can be an independent functional product, and can also be a computer, and a form of combining a tablet device with an external circuit.
3. The calibration system of the air quality sensor according to claim 1, wherein: the standard data equipment can have one or more data output modes, such as a serial port, a voltage value, a TCP/IP (transmission control protocol/Internet protocol) and the like, when the communication mode is not consistent with the communication mode required by the information centralized processing module, a standard equipment communication conversion module is required to be added, and the standard equipment communication conversion module is used for converting the data of the standard equipment into the communication mode which can be read and identified by the information centralized acquisition module.
4. The calibration system of the air quality sensor according to claim 1, wherein: the calibration tooling plate can be connected with the sensors in a one-to-one manner or in a one-to-many manner.
5. The calibration system of the air quality sensor according to claim 1, wherein: the calibration tooling plate has a unique ID in the system.
6. The calibration system of the air quality sensor according to claim 1, wherein: the reading of the calibration tooling plate to the sensor data can be serial polling or parallel simultaneous.
7. The calibration system of the air quality sensor according to claim 1, wherein: the information centralized processing module automatically or remotely controls the pollutant generator to work.
8. The calibration system of the air quality sensor according to claim 1, wherein: the pollutant generator may be a carbon dioxide emitter, a formaldehyde emitter, or a PM2.5 smoke generator.
9. The calibration system of the air quality sensor according to claim 1, wherein: the hardware form of the communication interface can also be various interface forms, such as an aviation plug, a multi-pin connector with a lock, a multi-pin connector without a lock, an audio plug, an antenna for wireless mode and the like.
10. The calibration system of the air quality sensor according to claim 1, wherein: the communication bus can be a RS-485 bus, an RS-232 bus, a serial port, a parallel port, RS-485 bus, PWM, IIC, SPI, SWD and other wired communication modes, and WIFI, bluetooth,2.4G wireless, lora and other wireless communication modes.
11. A calibration method of an air quality sensor, a calibration system of an air quality sensor according to any one of claims 1 to 10, characterized by further comprising the following method:
s1: reading sensor data and confirming the state of the sensor;
s2: controlling the pollutant generator to work, and manufacturing a calibration environment;
s3: reading data of the pollutant standard data device and data of each sensor;
s4: calculating calibration parameters of each sensor through data and a built-in algorithm;
s5: accessing the calibration parameters into corresponding sensors;
s6: and reading sensor data, confirming the state of the sensor, and automatically finishing the selection of the sensor with larger data error and outputting an abnormal sensor report.
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| CN202210914840.3A CN115201425A (en) | 2022-08-01 | 2022-08-01 | Calibration system and calibration method of air quality sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116008385A (en) * | 2023-03-27 | 2023-04-25 | 北京英视睿达科技股份有限公司 | TVOC monitoring equipment calibration method |
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2022
- 2022-08-01 CN CN202210914840.3A patent/CN115201425A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116008385A (en) * | 2023-03-27 | 2023-04-25 | 北京英视睿达科技股份有限公司 | TVOC monitoring equipment calibration method |
| CN116008385B (en) * | 2023-03-27 | 2023-06-09 | 北京英视睿达科技股份有限公司 | TVOC monitoring equipment calibration method |
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