Wireless passive temperature sensor

Patent Number:	8,240,911
Issued:	August 14, 2012
Official Filing:	View the Complete Patent at the US Patent & Trademark Office
Technology:	Wireless Passive Radiation Sensor
Abstract:	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.
Application Number:	12/871,602
Filed:	August 30, 2010
Current U.S. Class:	374/117 ; 374/E11.011;
Current International Class:	G01K 11/26 (20060101);
Field of Search:	Search: </B></TD> <TD ALIGN="RIGHT" VALIGN="TOP" WIDTH="70%"> ;374/117-120,110,137,184,187,208,E11.011
Government Interests:	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.