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Technology Assessment of Sensor Systems for Prognostics and Health Monitoring
Keywords: Sensors, Health Monitoring, Prognostics
Prognostics and health monitoring (PHM) permits the reliability of a system to be assessed and predicted in its actual application conditions. There are several good reasons for implementing PHM in a product. If one can capture the life cycle conditions of a product in-situ, this data can be used to 1) provide advanced warning of failures; 2) minimize unscheduled maintenance, extend maintenance cycles, and maintain effectiveness through timely repair actions; 3) reduce life cycle cost of the product by decreasing inspection costs, downtime, and inventory; and 4) assist in the design and logistical support of fielded and future products. The key element of an in-situ PHM approach is the sensor system. In recent years, advances in the areas of sensor fabrication, microprocessors, compact non-volatile memory, battery technology, and wireless telemetry have led to state-of-the-art sensors modules and autonomous data loggers that can be used for PHM. However, not all sensor systems are appropriate for monitoring the health of products. In this paper, we will discuss the various requirements of sensors for PHM implementation. The requirements will mainly focus on monitoring electronic products and systems. Next, the technical attributes of fifteen commercially-available, state-of-the-art sensor systems are evaluated. Finally, a discussion of future trends in sensor system development for prognostics and health monitoring is given.
Brian A. Tuchband, Research Assistant
University of Maryland - CALCE
College Park, MD
USA


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