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Sensors 2008, 8(12), 7982-7995; doi:10.3390/s8127982

A Passive Wireless Temperature Sensor for Harsh Environment Applications

1, 1,* , 2 and 2
1 Department of Mechanical Engineering, University of Puerto Rico - Mayagüez Campus, Mayagüez, Puerto Rico, 00681-9045, USA 2 Boston Applied Technologies, Inc., 6F Gill Street, Woburn, MA 01801, USA
* Author to whom correspondence should be addressed.
Received: 21 October 2008 / Revised: 3 December 2008 / Accepted: 4 December 2008 / Published: 8 December 2008
(This article belongs to the Special Issue Wireless Sensor Technologies and Applications)
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High temperature sensors capable of operating in harsh environments are needed in order to prevent disasters caused by structural or system functional failures due to increasing temperatures. Most existing temperature sensors do not satisfy the needs because they require either physical contact or a battery power supply for signal communication, and furthermore, neither of them can withstand high temperatures nor rotating applications. This paper presents a novel passive wireless temperature sensor, suitable for working in harsh environments for high temperature rotating component monitoring. A completely passive LC resonant telemetry scheme, relying on a frequency variation output, which has been applied successfully in pressure, humidity and chemical measurement, is integrated with a unique high-k temperature sensitive ceramic material, in order to measure the temperatures without contacts, active elements, or power supplies within the sensor. In this paper, the high temperature sensor design and performance analysis are conducted based on mechanical and electrical modeling, in order to maximize the sensing distance, the Q factor and the sensitivity. In the end, the sensor prototype is fabricated and calibrated successfully up to 235ºC, so that the concept of temperature sensing through passive wireless communication is proved.
Keywords: High Temperature Sensor; Hash Environment Applications; Passive; Wireless High Temperature Sensor; Hash Environment Applications; Passive; Wireless
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Wang, Y.; Jia, Y.; Chen, Q.; Wang, Y. A Passive Wireless Temperature Sensor for Harsh Environment Applications. Sensors 2008, 8, 7982-7995.

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