INFRARED GAS SENSOR

摘要

PURPOSE:To provide an infrared gas sensor with simple structure capable of detecting the generation and increase of a gas to be detected while monitoring the generation and increase of an interfering gas in a space to be detected. CONSTITUTION:Utilizing the property that a wavelength maximizing the transmissivity of an interference filter 6 depends on the incident angle, the generation and increase of a gas to be detected are detected by use of the light 12 vertically incident to the interference filter, and the generation and increase of an interfering gas are detected by use of the light 13 incident on the interference filter 6 at an incident angle theta.