White-Cell구조를 응용한 비분산 적외선 이산화탄소 센서의 온도특성
Temperature Dependency of Non-dispersive Infrared Carbon Dioxide Gas Sensor by Using White-Cell Structure
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초록
NDIR CO2 gas sensor was prototyped with ASIC implemented thermopile sensor which included temperature sensor and White-Cell structure in this paper. The temperature dependency of dual infrared sensors (CO2 and reference IR sensors) has been characterized and their output voltage ratios according to the temperature and gas concentration were presented in this paper for achieving temperature compensation algorithm. The initial output voltages of NDIR CO2 gas and reference IR sensors showed 3rd order polynomial and linear output voltages according to the variation of ambient temperatures from 253 K to 333 K, respectively. The output voltages of temperature sensor presented a linear dependency according to the ambient temperature and could be described with . The characteristics of output voltage ratios could be modeled with five parameters which are dependent upon the ambient temperatures and gas concentration. The estimated CO2 concentrations showed relatively high error below 300 ppm (maximum 572 % at 7 ppm CO2 concentration), however, as the concentration increased from 500 ppm to 2,000 ppm, the overall estimated errors of CO2 concentrations were less than ±10% in this research
Abstract
NDIR CO2 gas sensor was prototyped with ASIC implemented thermopile sensor which included temperature sensor and White-Cell structure in this paper. The temperature dependency of dual infrared sensors (CO2 and reference IR sensors) has been characterized and their output voltage ratios according to the temperature and gas concentration were presented in this paper for achieving temperature compensation algorithm. The initial output voltages of NDIR CO2 gas and reference IR sensors showed 3rd order polynomial and linear output voltages according to the variation of ambient temperatures from 253 K to 333 K, respectively. The output voltages of temperature sensor presented a linear dependency according to the ambient temperature and could be described with . The characteristics of output voltage ratios could be modeled with five parameters which are dependent upon the ambient temperatures and gas concentration. The estimated CO2 concentrations showed relatively high error below 300 ppm (maximum 572 % at 7 ppm CO2 concentration), however, as the concentration increased from 500 ppm to 2,000 ppm, the overall estimated errors of CO2 concentrations were less than ±10% in this research
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