基于恒电流源的电阻式气敏传感器检测系统

J4 ›› 2012, Vol. 30 ›› Issue (4): 376-.

基于恒电流源的电阻式气敏传感器检测系统

刘树海^a,b|郑传涛^a,b|徐琳^a,b|宋宏伟^a,b

吉林大学 a.集成光电子学国家重点联合实验室;b.电子科学与工程学院,长春 130012

出版日期:2012-07-26 发布日期:2012-10-12
作者简介:刘树海（1988— ）|男|吉林白山人|吉林大学硕士研究生|主要从事气体传感器电路与系统研究|（Tel）86-13944803178（E-mail）liushuhai432@yahoo.cn；通讯作者：徐琳（1983— ）|女|吉林通化人|吉林大学讲师|博士|主要从事低维纳米传感器研究|（Tel）86-13578921085 （E-mail）linxu@jlu.edu.cn；宋宏伟（1967— ）|男|黑龙江阿城人|吉林大学教授|硕士生导师|主要从事生物传感器研究|（Tel）86-431-85155129 （E-mail）songhongwei2000@sina.com.cn
基金资助:
国家“863”计划基金资助项目（2007AA06Z112,2007AA03Z446,2009AA03Z442）；国家自然科学基金资助项目(61077074)

Resistance Type Gas Sensing System Based on Constant Current Circuit

LIU Shu-hai^a,b,ZHENG Chuan-tao^a,b,XU Lin^a,b,SONG Hong-wei^a,b

a.State Key Laboratory on Integrated Optoelectronics;b.College of Electronic Science and Engineering,Jilin University,Changchun 130012,China

Online:2012-07-26 Published:2012-10-12

摘要/Abstract

摘要：

为保证电阻式气敏元件的高精度检测，设计了一种基于恒流源的气体浓度检测系统。该系统利用恒电流源，使传感元件电阻与电压变化呈线性关系，以提高气敏元件阻值随
气体浓度变化的准确度。恒电流源包括基准稳压电源、电流负反馈电路、稳压二极管和待测气敏元件。经过参数整定，其测电阻范围可达0～1 000 kΩ，平均测量误差小于0.027 2%。利用SnO2传感器检测浓度为0～2 05357 mg/m³的乙醇气体，测量出传感器电阻随浓度增加呈e指数下降趋势，系统最大测量误差小于±1.5%。

关键词: 气敏传感器, SnO₂传感器, 测量误差

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 0～1 000 kΩ,andcorresponding average measuring error is less than 0.027 2%.By using SnO₂sensor 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%.

Key words: gas sensor, SnO₂ sensor, measurement error

中图分类号:

TP212

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]. J4, 2012, 30(4): 376-.

LIU Shu-hai,ZHENG Chuan-tao,XU Lin,SONG Hong-we. Resistance Type Gas Sensing System Based on Constant Current Circuit[J]. J4, 2012, 30(4): 376-.