Title :
Novel NDIR CO2 sensor for indoor air quality monitoring
Author :
Yi, SeunrrHwan ; Park, YoungHwan ; Han, Seungoh ; Min, NamKi ; Kim, EunSok ; Ahn, TaeHwan
Author_Institution :
Dept. of Mech. Eng., Chungju Nat. Univ., Chungbuk, South Korea
Abstract :
This paper describes NDIR CO2 gas sensor with novel optical cavities and two elliptical mirrors that are optimized for the optical path and light intensity. The new structures have two distinct features: one is focusing of infrared (IR) light onto the detector with the minimum cavity volume, and the other is an increased optical path length in order to enhance the sensitivity and accuracy. The developed sensor module shows about 360 mV voltage differences from 0 to 2000 ppm CO2 concentration with 18,000 amplification gain. The response time of sensor module is around 30 sec.
Keywords :
air pollution measurement; carbon compounds; gas sensors; infrared detectors; mirrors; optical focusing; optical resonators; optical sensors; 200 ms; CO2; NDIR carbon dioxide sensor; amplification gain; elliptical mirror; indoor air quality monitoring; infrared; light intensity; minimum cavity volume; optical cavity; optical focusing; optical path; response time; sensor module; Carbon dioxide; Energy efficiency; Gas detectors; Infrared detectors; Mirrors; Monitoring; Optical sensors; Stimulated emission; Temperature sensors; Ventilation;
Conference_Titel :
Solid-State Sensors, Actuators and Microsystems, 2005. Digest of Technical Papers. TRANSDUCERS '05. The 13th International Conference on
Print_ISBN :
0-7803-8994-8
DOI :
10.1109/SENSOR.2005.1497296
