Calibration device for PM2.5 sensors and calibrating method thereof

Abstract

The invention relates to a calibration device for PM2.5 sensors. The calibration device for the PM2.5 sensors comprises a PM2.5 gas generation device, a plurality of standard sensors and an industrial personal computer, wherein the PM2.5 gas generation device comprises a testing cavity for accommodating a gas mixture; in the gas mixture,PM2.5 particulates are uniformly mixed; the standard sensors are distributed in the testing cavity; the industrial personal computer is connected with the PM2.5 gas generation device, the standard sensors and the PM2.5 sensors; the industrial personal computer can control the PM2.5 concentration of the gas mixture inside the testing cavity of the PM2.5 gas generation device; the standard sensors can detect the PM2.5 concentration of the gas mixture; the industrial personal computer can collect PM2.5 concentration values of the gas mixture measured by the standard sensors and the PM2.5 sensors, and the PM2.5 sensors are calibrated according to errors between measured values of the PM2.5 sensors and the standard sensors. According to the calibration device, independent detection and calibration for the batched PM2.5 sensors can be realized, the measurement accuracy of the PM2.5 sensors is guaranteed, the qualification rate is improved, the rework amount is reduced, and the production cost is reduced.

Description

technical field [0001] The invention relates to a sensor calibration device and a sensor calibration method. Background technique [0002] At present, due to the increasingly serious environmental pollution, people pay more and more attention to the environment. Now the phenomenon of air haze appears more and more everywhere, and the main pollutant in the haze is PM2.5 particulate matter. In order to be able to monitor the concentration of PM2.5 in the air, it is often necessary to use a PM2.5 sensor to obtain the concentration data of PM2.5 in the air through the PM2.5 sensor. During the manufacturing process of the PM2.5 sensor, due to the influence of the manufacturing process, it is necessary to test each PM2.5 sensor produced to determine whether the PM2.5 sensor is usable within the error range and whether the accuracy is sufficient. However, in the existing PM2.5 sensor detection process, the PM2.5 sensor detection equipment can only judge whether the data detected ...

AI Technical Summary

Problems solved by technology

However, in the existing PM2.5 sensor detection process, the PM2.5 sensor detection equipment can only judge whether the data detected by the PM2.5 sensor is within the allowable tolerance range compared with the standard value, and if it is, it is a qualified product , if not, it is a non-qualified product

The PM2.5 sensor detection equipment cannot guarantee the consistency and error level of mass-produced PM2.5 sensors, let alone carry out targeted calibration and compensation for mass-produced PM2.5 sensors

This results in poor consistency, low accuracy, low yield rate, large amount of rework, and serious waste in production and after-sales of the produced PM2.5 sensors.

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