보상용 적외선 센서를 사용한 비분산 적외선 이산화탄소 센서의 온도특성
Temperature Dependency of Non-dispersive Infrared Carbon Dioxide Gas Sensor by using Infrared Sensor for Compensation
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초록
NDIR CO2 gas sensor was built with ASIC implemented thermopile sensor which included temperature sensor and unique elliptical waveguide structures in this paper. The temperature dependency of dual infrared sensor module (CO2 and reference IR sensors) has been characterized and its output voltage characteristics according to the temperature and gas concentration were proposed for the first time. NDIR CO2 gas and reference IR sensors showed linear output voltages according to the variation of ambient temperatures from 243 K to 333 K and their slopes were 14.2 mV/K and 8.8 mV/K, respectively. The output voltages of temperature sensor also presented a linear dependency according to the ambient temperature and could be described with . The output voltage ratio between CO2 and reference IR sensors revealed irrelevant to the changes of ambient temperatures and gave a constant value around 1.6255 with standard deviation 0.008 at 0 ppm. The output voltage of CO2 gas sensor at zero ppm CO2 gas consisted of two components; one is caused by the HPB (half pass-band) of IR filter and the other is attributed to the part of CO2 absorption wavelength. The characteristics of output voltages of CO2 gas sensor could be accurately modeled with three parameters which are dependent upon the ambient temperatures and represented small average error less than 1.5% with 5% standard deviation.
Abstract
NDIR CO2 gas sensor was built with ASIC implemented thermopile sensor which included temperature sensor and unique elliptical waveguide structures in this paper. The temperature dependency of dual infrared sensor module (CO2 and reference IR sensors) has been characterized and its output voltage characteristics according to the temperature and gas concentration were proposed for the first time. NDIR CO2 gas and reference IR sensors showed linear output voltages according to the variation of ambient temperatures from 243 K to 333 K and their slopes were 14.2 mV/K and 8.8 mV/K, respectively. The output voltages of temperature sensor also presented a linear dependency according to the ambient temperature and could be described with . The output voltage ratio between CO2 and reference IR sensors revealed irrelevant to the changes of ambient temperatures and gave a constant value around 1.6255 with standard deviation 0.008 at 0 ppm. The output voltage of CO2 gas sensor at zero ppm CO2 gas consisted of two components; one is caused by the HPB (half pass-band) of IR filter and the other is attributed to the part of CO2 absorption wavelength. The characteristics of output voltages of CO2 gas sensor could be accurately modeled with three parameters which are dependent upon the ambient temperatures and represented small average error less than 1.5% with 5% standard deviation.
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