Simulation Method for Optical System of an Infrared Gas Sensor

The IR source, gas chamber, optical filter and detector of nondispersive infared (NDIR) gas sensor are the components which interact directly with IR radiation, so they are called optical system of sensor. The design of optical system is one of the keys of NDIR gas sensor development, but manufacturing prototype of sensor is very expensive and time-consuming, this limits the number of design variants to be considered. To slove this problem, a simulation method of optical system is presented, response of optical system can be obtained by using this method. The agreement between simulated and measured response proves the feasibility of simulation.