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NDIR gas sensor system and temperature and humidity compensation method thereof

A technology of gas sensor and temperature and humidity compensation, which is applied in the field of NDIR gas sensor, can solve the problems of unfavorable sensor miniaturization, unfavorable sensor miniaturization, insufficient gas absorption, etc., and achieve the elimination of light source jitter, accurate real-time measurement of concentration, and small structure Effect

Inactive Publication Date: 2019-07-12
NANJING UNIV OF INFORMATION SCI & TECH
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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

Method used

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  • NDIR gas sensor system and temperature and humidity compensation method thereof
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  • NDIR gas sensor system and temperature and humidity compensation method thereof

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Embodiment Construction

[0041] The technical solutions of the present invention will be clearly and completely described below through specific embodiments.

[0042] A kind of NDIR gas sensor system of the present invention, specific structure is as figure 1 As shown, it includes an infrared sensor unit, a microprocessor and a concentration display unit, and the microprocessing system is respectively connected with the infrared sensor unit and the concentration display unit; the microprocessing system is embedded with a GSO-BP neural network algorithm.

[0043] The concrete structure of infrared sensor unit of the present invention is as figure 2As shown, the infrared gas sensor of the present invention adopts a structural design of a single light source and two optical paths, including a measurement channel 1 and a reference channel 2, and specifically includes a sampling gas chamber 3 of the infrared sensor, a temperature sensor 4, a humidity sensor 5, and two pyrothermal sensors. Electrical dete...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3504G01N21/25G06N3/04G06N3/08
CPCG01N21/3504G01N21/255G06N3/084G01N2021/0112G01N2201/0662G01N2201/068G01N2201/1211G01N2201/1214G01N2201/1296G06N3/044
Inventor 常建华赵勇毅李红旭沈婉豆晓雷房九龙
Owner NANJING UNIV OF INFORMATION SCI & TECH
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