Development of wireless, batteryfree gyroscope based on one-port SAW delay line and double resonant antenna

A wireless, battery-free micro-gyroscope was developed by employing a one-port surface acoustic wave (SAW) reflective delay line, a SAW resonator, and an antenna. Two SAW devices with different center frequencies were simultaneously activated by a single antenna with double resonant frequencies. An...

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Bibliographic Details
Published in:Sensors and actuators. A. Physical. 2014-12, Vol.A220, p.270-280
Main Authors: Fu, Chen, Elmazria, Omar, Sarry, Frederic, Mahalingam, Thaiyan, Yang, Sang Sik, Lee, Keekeun
Format: Article
Language:English
Subjects:
Activation energy
Antennas
Delay lines
Devices
Gyroscopes
Linearity
Reflection
Resonators
Surface acoustic waves
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Summary:A wireless, battery-free micro-gyroscope was developed by employing a one-port surface acoustic wave (SAW) reflective delay line, a SAW resonator, and an antenna. Two SAW devices with different center frequencies were simultaneously activated by a single antenna with double resonant frequencies. An 80 MHz RF energy from antenna activates a double-port SAW resonator while a 195 MHz RF energy activates a one-port SAW delay line. The fabricated gyroscope showed clear reflection peaks with high signal-to-noise (S/N) ratios in both the time and frequency domains in measurement system during wireless testing. Upon rotation of the device, large shifts of the reflection peaks were observed owing to a secondary wave interference effect caused by the Coriolis force that depends on the spinning rate. The measured sensitivity and linearity of the developed gyroscope were, respectively, 1.35deg/(deg/s) and 0.91, which are promising values for our targeted applications. The temperature, metal mass effect, and vibration/shock effects were also studied and the results are discussed.
ISSN:0924-4247
DOI:10.1016/j.sna.2014.10.023