Design and implementation of vehicle exhaust gas analyzer in NDIR method

In order to implement the quantitative measurement of CO,CO_2,HC in vehicle exhaust gas the working process of measuring the gas concentration by using NDIR method is analyzed.And a measurement system is set up based on it.The implementation idea of the hardware circuit and software program in practical application is described.By testing the octual exhaust gas,it is verified that the method is exact and more precise than usual one.