传感技术学报
傳感技術學報
전감기술학보
Journal of Transduction Technology
2010年
2期
175-178
,共4页
简家文%王金霞%沈杰%章东兴
簡傢文%王金霞%瀋傑%章東興
간가문%왕금하%침걸%장동흥
氧传感器%极限电流%正常扩散和尼德森扩散机理%低气压
氧傳感器%極限電流%正常擴散和尼德森擴散機理%低氣壓
양전감기%겁한전류%정상확산화니덕삼확산궤리%저기압
oxygen sensor%limiting current%the normal and Knudsen diffusion mechanisms%low gas pressure
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30 μm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,Ⅰ_L与氧浓度的对数表达式ln(1-Xo_1)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,Ⅰ_L受气压P的影响,并呈现Knudsen模型的某些特征.
對氣壓變化對極限電流型氧傳感器擴散機理的影響進行瞭研究.實驗中將擴散孔徑為30 μm的極限電流型氧傳感器先後放置在不同氣壓環境中進行瞭電學性能測試.實驗結果顯示:在常壓下該氧傳感器的極限電流,Ⅰ_L與氧濃度的對數錶達式ln(1-Xo_1)具有很好的線性關繫,呈現正常擴散模型的特徵.但在低氣壓環境下,該傳感器的極限電流,Ⅰ_L受氣壓P的影響,併呈現Knudsen模型的某些特徵.
대기압변화대겁한전류형양전감기확산궤리적영향진행료연구.실험중장확산공경위30 μm적겁한전류형양전감기선후방치재불동기압배경중진행료전학성능측시.실험결과현시:재상압하해양전감기적겁한전류,Ⅰ_L여양농도적대수표체식ln(1-Xo_1)구유흔호적선성관계,정현정상확산모형적특정.단재저기압배경하,해전감기적겁한전류,Ⅰ_L수기압P적영향,병정현Knudsen모형적모사특정.
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 Ⅰ_L was quite linear with ln(1 -Xo_2) rather than Xo_2 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 Ⅰ_L was changed with the variation of total gas pressure P. This reveals the gas diffusion mechanisms belong to some Characteristics of the Knudsen diffusion .