Absorbing cavity of infrared gas sensor with wide spectrum light source

Abstract

The invention belongs to an absorbing cavity of an infrared gas sensor with wide spectrum light source within the range of an explosion-proof air detecting device for mine safety. The absorbing cavity of the infrared gas sensor is composed of an upper reflecting mirror with concave spherical surface and a lower reflecting mirror with concave spherical surface; light source position and detector position are in mutual conjugation, the lower reflecting mirror with concave spherical surface, the light source and the detector are fixed on a bracket, and the upper reflecting mirror with concave spherical surface is fixed on the housing of the sensor. The invention adopts quasi-optics resonate cavity design to enable the light source and the detector to correspond with imaging relationship after multiple light path folding, a beam imaged on the detector is in dispersion, so that the beam is evenly distributed, and the noise-signal ratio of the optical signal is improved. The invention not only reduces the volume of the absorbing cavity, but also improves the absorbing effect of tested air to light; in addition, the invention satisfies the requirement to the absorbing cavity of the infrared gas sensor with wide spectrum light source.

Description

technical field [0001] The invention belongs to the scope of explosion-proof gas detection equipment for mine safety, and in particular relates to an absorption cavity of a wide-spectrum light source infrared gas sensor. Background technique [0002] The technology of detecting the concentration of the target gas by using the absorption characteristics of the gas to be measured on the infrared spectrum has made great progress in recent years. Infrared gas detection technology is usually used in occasions that require real-time, high-precision monitoring of the target gas concentration. For example, the monitoring of gas concentration at various points in the underground coal mine, the monitoring of oil refineries in the petrochemical industry, the monitoring of oil pipelines, natural gas production and transmission pipelines and other occasions that need to monitor leakage. However, with the development of technology, the reduction of cost and the improvement of people's re...

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide an absorption cavity for a wide-spectrum light source infrared gas sensor for the detection sensitivity and light energy utilization rate of the existing absorption cavity, which is characterized in that the absorption cavity of the infrared gas sensor is composed of an upper concave spherical surface Composed of a reflector and a downward convex spherical reflector, the light source and the infrared detector are fixed on one side of the downward convex spherical reflector or respectively fixed on the reflective side of the upper concave spherical reflector and the lower convex spherical reflector, and are fixed on the bracket, and the upper concave The spherical reflector is fixed on the sensor housing, and the light beam emitted by the light source is reflected back and forth between the concave spherical reflector and the downward convex spherical reflector. After multiple times of optical path folding, it conforms to the imaging relationship; the light beam enters the receiving surface of the detector, forming the conjugate imaging position of the detector in the optical system with the light source as the object, or setting the infrared detector on the defocused position on the optical path, This improves the signal-to-noise ratio of the optical signal and improves the stability and measurement accuracy of the detection data.

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