NON-DISPERSIVE INFRA-RED ABSORPTION (NDIR) TYPE GAS SENSOR WITH COLLIMATED LIGHT SOURCE

摘要

A non-dispersive infrared gas sensor having a parallel light source is provided to improve the sensitivity of the sensor and reduce an optical path required to achieve the same sensitivity. A non-dispersive infrared gas sensor includes an infrared light source(300), an optical cavity(100) having a geometrically arranged reflecting surface and forming an extended optical path according to multi-reflection, and an optical sensor unit(500) which is located at the termination of the optical path and measures the intensity of infrared rays of a specific wavelength, which are partially absorbed by specific gas on the optical path and then arrived at the optical sensor unit.