Side wall air inlet/outlet infrared air sensor

Abstract

The invention relates to a side wall air inlet / outlet infrared air sensor, which comprises a sensing head, a signal acquisition module, a signal processing module and a signal display module, and is characterized in that the sensing head has a side wall air inlet / outlet and comprises a dustproof cover 1, a cavity 2 which has a side wall air inlet / outlet and functions of an optical channel and an air chamber, a reflector 3, a reflector 4, a thermopile detector 5, an infrared light source 6, a condenser lens 7, a heating resistor 8 and a signal amplification circuit 9, wherein an optical path is an 'n'-shaped folded optical path consisting of a first through hole 10, a second through hole 11, a third through hole 12, the reflector 3 and the reflector 4. As a side wall air inlet / outlet mode is adopted, the air in the air chamber and the air in the outside form good convection currents directly, the inside and outside air exchange time is shortened, and the response time is short; and dueto the multiple reflection of the light in a transmitting process, the optical path is prolonged and the resolution is improved. The sensor is expected to be widely used for real-time air monitoring on various occasions.

Description

technical field [0001] The invention relates to an infrared gas sensor, in particular to an infrared gas sensor with side wall gas in / out. The invention belongs to the field of infrared gas sensors. Background technique [0002] In recent years, with the frequent occurrence of flammable and explosive gas leakage and explosion accidents, people's demand for gas sensors is increasing. Among them, conventional gas sensors can be generally divided into semiconductor gas sensors, electrochemical gas sensors, catalytic combustion gas sensors, optical gas sensors, etc. according to their working principles. [0003] Semiconductor gas sensors have poor long-term stability, are greatly affected by the environment, and have low selectivity to gases. [0004] The electrochemical gas sensor is greatly affected by the environment when measuring, the calibration period is short, the stability is poor, and it is easy to be poisoned. [0005] Catalytic combustion gas sensors have poor se...

AI Technical Summary

Problems solved by technology

The design of the above patents is exquisite, but it is not easy to realize engineering

At the same time, the diffused infrared gas sensor that has been commercialized at present adopts top air intake, and its response time is relatively long. The 4R series CO 2 and CH 4 Infrared gas sensor response time (T 90 ) less than 35 seconds, British Dynament company infrared sensor response time (T 90 ) is less than 30s, and the response time of the infrared gas sensor produced by Hanwei in China (T 90 ) less than 30s

The cavity processing engineering is not easy, and the response time is slightly longer, which directly affects the popularization and application of infrared gas sensors

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