Four-series non-dispersive infrared gas sensor

Abstract

The invention discloses a four-series non-dispersive infrared gas sensor which includes a shell body, and a detector and a light source which are arranged in the shell body. A pedestal in the shell body is also provided with: an outer wall of an annular air chamber wall of the detector, an inner wall, which is concentric with the detector, of an external circular-arc-shaped reflective wall, a first bias guide reflective surface, a second bias guide reflective surface and a third bias guide reflective surface. The light source is arranged between the outer wall and the inner wall. The first bias guide reflective surface reflects infrared light emitted from the light source successively through the second bias guide reflective surface and the third bias guide reflective surface and then the infrared light enters the detector. The gas sensor is more sufficient in space utilization. A lengthened optical path is distributed more uniformly inside the shell body of the gas sensor. A humiture sensor is designed in the gas chamber, so that the gas sensor is improved in sensitivity and can provide humiture compensation more accurately.

Description

technical field [0001] The invention relates to a gas sensor, in particular to a gas detection device for measuring gas concentration by detecting the absorption of optical radiation by the gas when the gas chamber contains the gas to be measured. Background technique [0002] Gas (mainly composed of methane) explosion accidents in industrial mine production are a major threat to safe production. At present, domestic coal mine safety monitoring generally uses catalytic combustion sensors to detect gas concentration. The catalytic combustion sensor has the advantages of high sensitivity, linear output, not easily affected by temperature and humidity, and low price. However, the catalytic element is easily poisoned by organosilicon or sulfide, and the sensitivity will drop sharply without warning, bringing great safety hazards. Moreover, the sensor works for a long time, and the zero point drift and sensitivity attenuation are inevitable. The zero point must be adjusted at reg...

AI Technical Summary

Problems solved by technology

[0013] Due to the limited space of the four series of gas sensors, without changing the package size of the infrared light source and pyroelectric detector, this structural design has formed a strong patent protection barrier, which has greatly hindered the development of this technology in China.

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