吉林大学学报（信息科学版）2012，Vol.30Issue(4)：376-380,5.
基于恒电流源的电阻式气敏传感器检测系统
Resistance Type Gas Sensing System Based on Constant Current Circuit
摘要
Abstract
In order to ensure the measuring accuracy of resistance type sensor,a gas detecting system based on constant current circuit has been designed. The system uses constant current to make the gas sensor's resistance linear with output voltage,so that the detecting resistance accuracy of gas sensor is improved. The constant current circuit consists of reference voltage supply, current negative feedback circuit, voltage stabilizing diode, and load resistance. After calibration,its measuring range is 0~l 000 kΩ,and corresponding average measuring error is less than 0. 0272%. By using SnO2 sensor to detect 0~2 053. 57 mg/m3 ethanol gas, the calibration results show that the resistance decreases exponentially as the concentration increases , and the maximum detection error is less than +1, 5%.关键词
气敏传感器/SnO2传感器/测量误差Key words
gas sensor/SnO2 sensor/measurement error分类
信息技术与安全科学引用本文复制引用
刘树海,郑传涛,徐琳,宋宏伟..基于恒电流源的电阻式气敏传感器检测系统[J].吉林大学学报（信息科学版）,2012,30(4):376-380,5.基金项目
国家“863”计划基金资助项目(2007AA06Z112,2007AA03Z446,2009AA03Z442) （2007AA06Z112,2007AA03Z446,2009AA03Z442）
国家自然科学基金资助项目(61077074) （61077074）
