IEEE Sensors Journal, Volume 10, Issue 4, pp. 856 – 862, 2010

A Wireless Sensor System for Prognostics and Health Management

Shunfeng Cheng, Student Member, IEEE
Prognostics and Health Management Laboratory
Center for Advanced Life Cycle Engineering (CALCE)
University of Maryland,
College Park, MD 20742 USA

Kwok Tom, Member, IEEE
Army Research Laboratory
Adelphi, MD 20783 USA

Larry Thomas
ePrognostic Systems LLC
Leander, TX 78641 USA

Michael G. Pecht, Fellow, IEEE
Prognostics and Health Management Center
City University of Hong Kong
Center for Advanced Life Cycle Engineering (CALCE)
University of Maryland
College Park, MD 20742 USA



This paper introduces a novel radio-frequency-based wireless sensor system and describes its prognostics and health management functions. The wireless sensor system includes a radio frequency identification sensor tag, a wireless reader, and diagnostic-prognostic software. The software uses the sequential probability ratio test with a cross-validation procedure to detect anomalies, assess degradation, and predict failures. The prognostic performance of the sensor system is demonstrated by a field application.

Index Terms—Cross-validation, prognostics and health management (PHM), radio frequency identification (RFID), sequential probability ratio test (SPRT), wireless sensor system.

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