Temperature Gradient Effect on Gas Discrimination Power of a Metal-Oxide Thin-Film Sensor Microarray

Sensors

Victor V. Sysoev¹  Ilya Kiselev²  Markus Frietsch² 

[1] Department of Physics, Saratov State Technical University, Polytechnicheskaya 77, Saratov 410054, Russia;Institute for Instrumental Analysis, Forschungszentrum Karlsruhe, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany

关键词: Electronic nose;    gas-sensor microarray;    metal-oxide thin film;   

DOI  :  10.3390/s40400037

来源: mdpi

【 摘 要 】

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 SnO₂ film employed in the KAMINA electronic nose. Three different temperature distributions over the substrate are discussed: a nearly homogeneous one and two temperature gradients, equal to approx. 3.3 °C/mm and 6.7 °C/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 target vapors: ethanol, acetone, propanol and ammonia. It is shown that the application of a temperature gradient increases the gas discrimination power of the microarray by up to 35 %.

【 授权许可】

CC BY   
© 2004 by the authors; licensee MDPI, Basel, Switzerland.