Abstract

The gas chamber is one of the most important components of the non-spectral infrared gas sensor, and its design will directly affect the performance of the sensor. Based on the principle of non-spectral infrared detection, the relevant research on carbon dioxide sensing chamber is carried out in this paper. The optical simulation software Tracepro is used to analyze the ray tracing and the light flux of the detection surface of the cuboid and cylindrical gas chambers; The length of the gas chamber and the infrared absorption efficiency of the gas are theoretically studied, and the length of the gas chamber and the infrared absorption efficiency of the gas are simulated using CFD software Ansys Fluent, which provides a basis for the selection of the length of the gas chamber; The relationship between the inner diameter of the gas chamber and the infrared light reflection loss is analyzed, which provides a reference for the selection of the inner diameter of the gas chamber; At the same time, the reflectivity and related physical properties of the gas chamber coating material were studied. Therefore, this study has a certain guiding role in the design of the gas chamber of a high-performance non-spectral infrared carbon dioxide gas sensor.

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