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http://dx.doi.org/10.4313/JKEM.2005.18.7.628

NDIR CO2 Gas Sensor for Improving Indoor Air Quality  

Yi, Seung-Hwan (충주대학교 정보제어공학과)
Park, Jeong-Min (충주대학교 정보제어공학과)
Park, Young-Hwan (충주대학교 정보제어공학과)
Han, Seung-Oh (고려대학교 전기공학과)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.18, no.7, 2005 , pp. 628-634 More about this Journal
Abstract
We have simulated and proposed novel optical cavity, which has two elliptical mirrors, for NDIR gas sensor module and have tested it from 0 ppm to 2,000 ppm $CO_2$ concentration. The proposed sensor module shows the maximum peak voltage at 500 ms pulse modulation time, however, it shows a maximum voltage changes at 200 ms pulse duration with 18,000 times amplification gain. From 0 ppm to 2,000 ppm, the voltage difference of sensor module $({\Delta}V)$ shows 360 mV at 200 ms pulse duration and 3 sec turn-off time. The response time of designed sensor module is about 30 seconds.
Keywords
Indoor all qualify; NDIR gas sensor; Optical cavity; Concave elliptical mirrors;
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