Research on Optical Air Chamber of Infrared Gas Sensor

In this paper, design method of optical air chamber for infrared gas sensor is described in detail based on the principle of infrared absorption by gas molecule. IRL715 infrared light source and PYS3228 pyroelectric detector with double filters are adopted to detect signal. The optical air chamber is processed with waterproof and dustproof treatment. Effect analysis for sensor performance of two different optical air chamber structures, which are side opening and top opening, is carried into execution through accurate experiments. Experiment results reveal that structure of optical air chamber has significant effect on the capability of sensor. Comparing with top opening structure, the side opening structure can improve sensitivity and accuracy of optical air chamber to a great extent.