Infrared gas sensor with low energy consumption

Abstract

The invention belongs to an infrared gas sensor with low energy consumption within the range of gas explosion-proof detection device for mining safety. The infrared gas sensor is mainly composed of an absorbing cavity, a light source and an infrared detector, wherein, the adsorbing cavity is composed of a big spherical mirror and a small spherical mirror; the big spherical mirror is fixed on a bracket above the small spherical mirror; the light source is arranged on the concave surface center of the small spherical mirror between two spherical mirrors; the small spherical mirror, the light source and the detector are fixed on a support; and the above components form a sensor module. The invention ensures that the light source and the detector conform to imaging relationship after light path folding, light imaged on the detector is in diffusion form so as to evenly distribute light on the detector, so that the signal-to-noise ratio of optical signals is improved. The invention fully utilizes optical energy, effectively lowers light source energy consumption, and ensures that the power consumption of the sensor is smaller than 90mw.

Description

technical field [0001] The invention belongs to the scope of explosion-proof gas detection equipment for mine safety, and in particular relates to a low-energy infrared gas sensor. Specifically, the power consumption of the entire sensing head of the sensor is less than 90mw. 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, ...

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a low-energy infrared gas sensor for the detection sensitivity of the prior art absorption cavity and the low utilization rate of light energy. The infrared gas sensor is mainly composed of an absorption cavity, a light source and an infrared detector. Its characteristics The absorbing cavity is composed of two large and small spherical reflectors, the large spherical reflector is fixed on the bracket above the small spherical reflector, the light source is placed in the concave center of the small spherical reflector between the two spherical reflectors, At this time, the light beam emitted by the lower half of the light source goes out to the concave reflective surface of the small spherical reflector, and the reflective surface reflects the light beam to the concave reflective surface of the large spherical reflector. The beam emitted by the half part is emitted to the concave reflective surface of the large spherical reflector, and the large spherical reflector converges and reflects the beam into the detector. The beams reflected once or twice are reflected by the concave reflective surface of the large spherical reflector and enter the infrared detection Make the light source and the detector meet the imaging relationship after one or two reflections on the optical path. The useful aperture angle of the light source is greater than 180 degrees, making full use of the energy of light

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