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Special Issue: Modern Sensing Technologies

Vol. 90, April 2008, pp. 61-71



Wireless Passive Strain Sensor Based on Surface Acoustic Wave Devices


 T. Nomura, K. Kawasaki and A. Saitoh

Faculty of Engineering
Shibaura Institute of Technology, Tokyo, Japan
E-mail: nomurat@sic.shibaura-it.ac.jp



Received: 15 October 2007   /Accepted: 20 February 2008   /Published: 15 April 2008


Abstract: Surface acoustic wave (SAW) devices offer many attractive features for applications as chemical and physical sensors. In this paper, a novel SAW strain sensor that employs SAW delay lines has been designed. Two crossed delay lines were used to measure the two-dimensional strain. A wireless sensing system is also proposed for effective operation of the strain sensor. In addition, an electronic system for accurately measuring the phase characteristics of the signal wave from the passive strain sensor is proposed.


Keywords: Surface acoustic waves, SAW sensor, Strain sensor, Wireless sensing, SAW delay line


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