access icon free Ultra-wideband SAW sensors and tags

A sensor system using ultra-wideband frequency technology and passive surface acoustic wave (SAW) sensors/tags has been demonstrated experimentally. The system operates with a frequency bandwidth of 500 MHz, which results in compressed RF pulses of about 2 ns duration, including just a few sinusoids with amplitude modulation. A correlation method is developed to measure the delay between two echoes with high resolution, avoiding the phase ambiguity problem. For temperature, deformation or other measurand a simple structure including only two reflectors is sufficient. This method is used in a system which simultaneously remotely measures a few temperature sensors with a resolution of 0.1°C. The operation of the system in a strongly reflecting environment (inside a metal box) is demonstrated.

Inspec keywords: compressed sensing; surface acoustic wave sensors; temperature sensors

Other keywords: frequency 500 MHz; passive SAW sensors; temperature sensors; sensor system; frequency bandwidth; compressed RF pulses; ultrawideband SAW sensors

Subjects: Acoustical measurements and instrumentation; Sensing devices and transducers; Acoustic wave devices

References

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      • 2. Reindl, L., Scholl, G., Ostertag, T., Scherr, H., Wolff, U., Schmidt, F.: ‘Theory and application of passive SAW radio transponder as sensors’, IEEE Trans. Ultrason. Ferroelectr. Freq. Control, 1998, 45, (5), pp. 12811292 (doi: 10.1109/58.726455).
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      • 3. Kuypers, J.H., Reindl, L.M., Tanaka, S., Esashi, M.: ‘Maximum accuracy evaluation scheme for wireless SAW delay-line sensors’, IEEE Trans. Ultrason. Ferroelectr. Freq. Control, 2008, 55, (7), pp. 16401652 (doi: 10.1109/TUFFC.2008.840).
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      • 1. Plessky, V., Reindl, L.: ‘Review on SAW RFID tags’, IEEE Trans. Ultrason. Ferroelectr. Freq. Control, 2010, 57, (3), pp. 654668 (doi: 10.1109/TUFFC.2010.1462).
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2013.3333
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