© The Institution of Engineering and Technology
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.
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1. Plessky, V., Reindl, L.: ‘Review on SAW RFID tags’, IEEE Trans. Ultrason. Ferroelectr. Freq. Control, 2010, 57, (3), pp. 654–668 (doi: 10.1109/TUFFC.2010.1462).
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2013.3333
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