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.
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.
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