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Wireless passive temperature sensor

United States Patent

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August 14, 2012
View the Complete Patent at the US Patent & Trademark Office
Wireless Passive Radiation Sensor
A wireless passive temperature sensor comprising a surface acoustic wave (SAW) delay line is constructed on a piezoelectric substrate having a thermal coefficient of frequency. An array of addressable, wireless passive temperature sensors can be used to monitor an array of temperature points on a structure using a wireless reader. Each sensor can be monitored by measuring the frequency of maximum reflection in their respective bands. A wireless passive heat flux gauge uses two temperature sensors with different frequency and/or time delay responses to measure that temperature differential across a thermal conductor that has a well characterized thermal conductivity and thickness.
12/ 871,602
August 30, 2010
374/117 374/E11.011
G01K 11/26 (20060101)
STATEMENT OF GOVERNMENT INTEREST This invention was made with Government support under contract no. DE-AC04-94AL85000 awarded by the U.S. Department of Energy to Sandia Corporation. The Government has certain rights in the invention.