NDIR gas sensor system and temperature and humidity compensation method thereof

Abstract

The invention relates to an NDIR gas sensor system. The NDIR gas sensor system comprises an infrared sensor unit, a microprocessor and a concentration display unit, wherein the microprocessor system is connected with the infrared sensor unit and the concentration display unit; a sampling air chamber can effectively prolong an optical path and can control the volume of the air chamber to facilitatethe miniaturization of the sensor. The potassium bromide (KBr) window piece is arranged to avoid corrosion of a pyroelectric detector, the service life of the sensor is prolonged, and the optical paths of the measuring channel and the reference channel are completely symmetrical, so that the structural design of the single light source dual-optical path can eliminate the influence of external factors such as light source shake, optical device pollution and the like on the measuring precision to a certain extent. The NDIR gas sensor system and the temperature and humidity compensation method thereof employ a GSO-BP neural network to perform temperature and humidity compensation to overcome the defects of the empirical formula compensation method and the circuit compensation method in the prior art and lead the compensation process to be simpler and more accurate, and therefore, the precision is high, the cost is low and the structure is small compared to the prior art.

Description

technical field [0001] The invention relates to the field of NDIR gas sensors, in particular to an NDIR gas sensor system and a temperature and humidity compensation method. Background technique [0002] Infrared gas sensors have the advantages of wide measurement range, strong stability, high sensitivity, and long life. They have been widely used in many places such as chemical industry, coal, metallurgy, electric power, and environmental monitoring. They are important tools to ensure production and personnel safety. [0003] Common optical gas detection technologies include photoacoustic spectroscopy, photoionization technology and non-dispersive infrared detection technology. Among them, the non-dispersive infrared gas sensor has the characteristics of simple structure, stable performance, not easy to be poisoned, easy to integrate, etc., and has broad development prospects. In the early 1980s, the infrared gas analysis method began to be used in China. The initial infra...

AI Technical Summary

Problems solved by technology

The former is to use the coefficient calibration method to compensate after data collection, the calculation process is complicated and the effect is not good

The latter uses hardware circuit modules to keep the temperature and humidity of the detection environment in a dynamic balance, which greatly increases the burden on the circuit and is not conducive to the miniaturization of the sensor.

These two methods have great limitations in the actual measurement

[0005] On the other hand, the sampling gas chamber of the existing NDIR gas sensor generally adopts a direct-ray gas chamber structure. The sensor with this structure has a short optical path, insufficient gas absorption, and low measurement accuracy.

In order to obtain a high-performance NDIR gas sensor, it is necessary to extend the optical path by increasing the length of the gas chamber, which will lead to an increase in the volume of the entire system, which is not conducive to the miniaturization of the sensor

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