실내공기질측정을 위한 NDIR 방식 복합가스측정시스템 설계 및 구현

In this paper, we design and implement NDIR multi-gas detecting system. The optical chamber and hardware board for indoor air quality(IAQ) measurement is studied. The optical chamber has three optical cavity and air circulation hole with optical shielding. One light and three Infrared detectors for CO2, CO, and NO2 are located in the optical chamber. The hardware board is designed to operate by low power, and has three amplifier circuit for each gas concentration range. We evaluate the performance of NDIR multi-gas detecting system by the experiment to measure the air quality standard gas concentration.