摘要
对气压变化对极限电流型氧传感器扩散机理的影响进行了研究。实验中将扩散孔径为30μm的极限电流型氧传感器先后放置在不同气压环境中进行了电学性能测试。实验结果显示:在常压下该氧传感器的极限电流IL与氧浓度的对数表达式ln(1-XO2)具有很好的线性关系,呈现正常扩散模型的特征。但在低气压环境下,该传感器的极限电流IL受气压P的影响,并呈现Knudsen模型的某些特征。
In this article the gas diffusion mechanisms of the limiting current oxygen sensors was studied.For a limiting current oxygen sensor in which the pore diameter d is about 30μm,the diffusion of the limiting current IL was quite linear with ln（1-XO2） rather than XO2 at 1 atm gas pressure,it showed the normal mechanism was more dominant than the Knudsen one.However at the low gas pressure,the limiting current IL was changed with the variation of total gas pressure P.This reveals the gas diffusion mechanisms belong to some Characteristics of the Knudsen diffusion.
出处
《传感技术学报》
CAS
CSCD
北大核心
2010年第2期175-178,共4页
Chinese Journal of Sensors and Actuators
基金
国家自然科学基金资助(60971074)
浙江省自然科学基金资助(Y1080430)
宁波市自然科学基金资助(2009A610065)
关键词
氧传感器
极限电流
正常扩散和尼德森扩散机理
低气压
oxygen sensor
limiting current
the normal and Knudsen diffusion mechanisms
low gas pressure
