Wireless passive temperature sensor
| DWPI Title: Wireless passive temperature sensor i.e. surface acoustic wave temperature sensor, for arrangement in passive heat flux gauge to measure thermal profile of satellite, has antenna applying field, where time is determined based on coefficient |
| 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. |
| Use: Wireless passive temperature sensor i.e. SAW temperature sensor, for arranging on a side of a thermal conductor in a passive heat flux gauge to measure a spatial thermal profile of a remote structure i.e. satellite (all claimed). Can also be used for measuring heat flux of the remote structure. |
| Advantage: The sensor remotely measures the thermal profile of the structure by using a portable inexpensive transceiver. The sensor can be operated in a 915mega Hertz industrial, scientific and medical (ISM) band to eliminate licensing issues for a readout hardware. The sensor uses a center band frequency and/or a time delay to identify the sensor, where energy received from the antenna can be used for sensing measurement, thus improving signal-to-noise ratio of the sensor. The sensors at a set of different ranges with a set of different return amplitudes can be measured using a single stationary antenna since the measurement is relative to a maximum amplitude, thus eliminating effects on accuracy and resolution of the sensors with differing insertion loss due to a set of variations in processing over an area of a wafer or from the wafer to another wafer. |
| Novelty: The sensor (10) has a reflection interdigital transducer (12) for reflecting a launched surface acoustic wave (SAW) back to a launch interdigital transducer (11). An antenna (14) receives a transmitted radio frequency (RF) pulse and applies an RF electric field across the launch interdigital transducer to launch a SAW (15) and retransmit an RF pulse from the reflected SAW received at the launch interdigital transducer. A delay time between the launched SAW and the reflected SAW is determined based on a thermal coefficient of frequency of a piezoelectric substrate (13). |
| Filed: 8/30/2010 |
| Application Number: US2010871602A |
| Tech ID: SD 11151.0 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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