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Proceedings Paper

Wireless temperature sensor for bearing health monitoring
Author(s): Yi Jia; Jhon Henao-Sepulveda; Manuel Toledo-Quinones
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Paper Abstract

A remotely-powered wireless temperature sensor to monitor a bearing health has been developed. The device employs a pair of miniaturized temperature sensitive capacitors in a simple inductor-capacitor (L-C) oscillator configuration. The bearing temperature is encoded in the frequency of the oscillator’s signal. The signal is wirelessly monitored by a receiver, which is connected to a PC for further analysis. Energy for the sensor circuit’s operation is supplied by a second electromagnetic radio signal, produced by an exciter coil. Thus, no wires or batteries are attached to the sensor circuit. The devices are fabricated on Dupont Kapton thick film substrates using surface mount components, and can be integrated onto bearing cages during fabrication. The circuits are designed to have small size, low power consumption, wide dynamic range and very low cost. After a brief introduction, this article describes the circuits employed. Calibration results are then presented.

Paper Details

Date Published: 29 July 2004
PDF: 9 pages
Proc. SPIE 5391, Smart Structures and Materials 2004: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, (29 July 2004); doi: 10.1117/12.539578
Show Author Affiliations
Yi Jia, Univ. de Puerto Rico/Mayaguez (United States)
Jhon Henao-Sepulveda, Univ. de Puerto Rico/Mayaguez (United States)
Manuel Toledo-Quinones, Univ. de Puerto Rico/Mayaguez (United States)


Published in SPIE Proceedings Vol. 5391:
Smart Structures and Materials 2004: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems
Shih-Chi Liu, Editor(s)

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