Infrared gas sensor

Abstract

The invention relates to an infrared gas sensor. The infrared gas sensor comprises a power supply, a sensitive probe, a signal receiving circuit, an amplifying circuit, an analog-to-digital conversion circuit, a control circuit and an output display circuit. The sensitive probe comprises an air chamber, an infrared source, an infrared receiver, and five retroreflectors. Pins of the infrared source and the infrared receiver are connected with an external circuit through an air chamber wall. The five retroreflectors are arranged on the inner wall of the air chamber at the same interval. The infrared source and the infrared receiver are arranged on the inner walls between any two adjacent retroreflectors in reversal integration mode. Infrared lights are sent out from the infrared light source, back to the infrared receiver through reflection of the five retroreflectors, and form a regular pentagon light path. The regular pentagon light path and the inner wall of the air chamber are internally tangent. A plurality of ventholes are formed in the inner walls between the two adjacent retroreflectors. Accuracy of the infrared sensor is improved, gas exchange rate is increased, the gas sensor is quick in response and strong in real-time performance.

Description

technical field [0001] The invention relates to the technical field of gas sensors, in particular to an infrared gas sensor with small volume, high precision and fast response speed. Background technique [0002] A gas sensor is a converter that converts a certain gas volume fraction into a corresponding electrical signal. 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 been continuously developed. Its application range is also more and more extensive, such as the monitoring of gas concentration in mines and garbage drilling, the monitoring of oil refineries in the petrochemical industry, oil pipelines and natural gas pipelines, etc. As infrared gas sensor technology becomes more and more mature and its cost is reduced and its installation and portability become more convenient, infrared gas sensors are gradually applied to gas monitoring in public places, even hom...

AI Technical Summary

Problems solved by technology

[0003] In order to meet people's higher and higher requirements for the accuracy of gas sensors, the main aspect of improving the accuracy of infrared gas sensors is to increase the distance traveled by infrared light in the gas to be measured (that is, the effective absorption path). Infrared gas sensors generally improve the accuracy by increasing the volume of the gas sensor by physical distance, which increases the production cost and installation difficulty.

[0004] In addition, as the physical distance between the infrared light source and the infrared receiving device increases, the volume of the gas chamber increases, and the gas exchange speed between the external gas and the gas sensor gas chamber is slow, so that the monitoring of the gas sensor has a certain delay, and the real-time performance is not good. powerful

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