On-line Magazine 'Sensors & Transducers' (S&T e-Digest)
(ISSN 1726- 5479)
Vol. 54, Issue 4, April 2005, pp. 310-319
Environmental Influences on SMO Sensorsí Performance
Jian-Wei GONG1, Quan-Fang CHEN1*, Ming-Ren LIAN2, Nen-Chin LIU2
1Department of Mechanical, Material & Aerospace Engineering,
University of Central Florida, Orlando, FL, 32826, U.S.A.
Ph. (407) 823 2152 Fax: (407) 823 0208; E-mail: firstname.lastname@example.org
2TYCO SAFETY PRODUCTS-Sensormatic
6600 Congress Avenue, Boca Raton, FL, 33487 U.S.A.
Ph. (561) 912 6587; fax: (561) 912 6822; E-mail: email@example.com
* To whom correspondence should be addressed
Received: 19 March 2005 / Accepted: 12 April 2005 / Published: 20 April 2005
Abstract: Micromachined semiconductor metal oxide (SMO) gas sensors have good prospect of being solution as future gas sensor technology in terms of sensitivity, robustness, simple signal processing, low production cost and small size. However, there are some challenges for the commercialization of SMO sensor to meet both performance-related and reliability-related requirements, especially false alarm problems caused by environmental induced drifts and shifts. Several environmental influence factors that affect SMO sensorís performance, in terms of temperature variation, relative humidity and possibly others like light and oxygen partial pressure, are discussed in this paper. Principles behinds these influences are presented and schemes of eliminating these influences are reviewed and proposed.
Keywords: MEMS, SMO sensors, metal oxide gas sensors, ambient temperature, relative humidity, feedback control
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