temperature gradient effect on gas discrimination power of a metal-oxide thin-film sensor microarray对气体温度梯度影响歧视的金属氧化物薄膜传感器芯片.pdf

Sensors 2004, 4, 37-46 sensors ISSN 1424-8220 ©2004 by MDPI /sensors Temperature Gradient Effect on Gas Discrimination Power of a Metal-Oxide Thin-Film Sensor Microarray 1 2 2 2* Victor V. Sysoev , Ilya Kiselev , Markus Frietsch and Joachim Goschnick 1 Department of Physics, Saratov State Technical University, Polytechnicheskaya 77, Saratov 410054, Russia 2 Institute for Instrumental Analysis, Forschungszentrum Karlsruhe, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany * Authors to whom correspondence should be addressed. E-mail: achim.goschnick@ifia.fzk.de Received: 15 February 2004 / Accepted: 12 May 2004 / Published: 18 May 2004 Abstract: The paper presents results concerning the effect of spatial inhomogeneous operating temperature on the gas discrimination power of a gas-sensor microarray, with the latter based on a thin SnO film employed in the KAMINA electronic nose. Three different 2 temperature distributions over the substrate are discussed: a nearly homogeneous one and two temperature gradients, equal to approx. 3.3 oC/mm and 6.7 oC/mm, applied across the sensor elements (segments) of the array. The gas discrimination power of the microarray is judged by using the Mahalanobis distance in the LDA (Linear Discrimination Analysis) coordinate system between the data clusters obtained by the response of the microarray to four targ