A pm2.5 sensor and pm2.5 detection method based on infrared photoelectric conversion

Abstract

The invention provides a PM2.5 sensor based on infrared photoelectric conversion and a PM2.5 detection method. The PM2.5 sensor includes: a transmitting circuit that generates infrared rays according to the 10KHz carrier provided by the main control unit; a first receiving circuit and a second receiving circuit that respectively receive infrared signals and generate voltage signals that respond to PM2.5 concentration; provide 10KHz carrier 1. Compensate and calculate the zero voltage and sensitivity of the voltage signals that respond to the PM2.5 concentration in two channels to obtain the main control unit of the PM2.5 concentration; the input end of the transmitting circuit is connected to the output port of the main control unit, and the output of the first receiving circuit terminal and the output terminal of the second receiving circuit are respectively connected to different input ports of the main control unit. The invention uses two identical receiving circuits to detect the PM2.5 concentration, reduces the error, improves the detection accuracy, and utilizes the infrared photoelectric conversion technology, and the infrared device has simple structure, small volume, light weight and low price. The main control unit has the characteristics of low power consumption and good versatility.

Description

technical field [0001] The invention relates to the field of embedded technology, in particular to a PM2.5 sensor based on infrared photoelectric conversion and a PM2.5 detection method. Background technique [0002] With the prosperity and development of society, people's living standards continue to improve, but the continuous and in-depth development of industrialization has inevitably produced serious problems such as air pollution. In recent years, the air pollution index that people care about is mainly PM2.5 concentration. There are a lot of PM2.5 detection equipment on the market today, and some PM2.5 sensors use gravimetric method, micro-oscillating balance method and other methods to test the concentration of particulate matter and dust in the air. This type of monitoring method has very strict requirements on the accuracy of data such as air temperature, humidity, and airflow rate. A small deviation can make the monitoring results quite different, and the measure...

AI Technical Summary

Problems solved by technology

This type of monitoring method has very strict requirements on the accuracy of data such as air temperature, humidity, and airflow rate. A small deviation can make the monitoring results quite different, and the measurement accuracy is relatively low, but the cost is high

It is not conducive to large-scale popularization. Although another part of the PM2.5 sensor uses optical and chemical methods to measure the dust concentration in the air, the measurement accuracy has been improved, but its volume is too large and the price is also high.

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