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Sensors 2015, 15(10), 26643-26653; doi:10.3390/s151026643

Maximum Measurement Range and Accuracy of SAW Reflective Delay Line Sensors

Department of Instrument Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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Author to whom correspondence should be addressed.
Academic Editor: Gerhard Lindner
Received: 25 July 2015 / Revised: 27 September 2015 / Accepted: 12 October 2015 / Published: 20 October 2015
(This article belongs to the Special Issue Acoustic Waveguide Sensors)
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Abstract

In a surface acoustic wave (SAW) wireless sensor with a reflective delay line structure, three reflectors are often used to eliminate 2π ambiguity of phase measurement. The maximum range of the measured parameter and the maximum accuracy have recently been attracting much research attention. In this paper, an analytical formula for all the factors influencing the measurement range and accuracy of the delay line SAW sensor are deduced for the first time. The factors include: the sensor sensitivity, the topology of the delay line, the available wireless bandwidth and the allowed maximum phase measuring error of the reading system, which is easier to retrieve and more fully describes the possible noises than SNR. Additionally, many designers believe that increasing the reflector could improve accuracy continuously or realize multi-resolution measurement. However, they ignore some certain criteria that the reflector location must satisfy. The reachable maximum accuracy by every increase of a reflector is also presented. A SAW temperature sensor system using 128° YX-LiNbO3 is designed to verify the above theoretical analysis. View Full-Text
Keywords: SAW; reflective delay line; maximum phase measuring error; maximum range; maximum accuracy SAW; reflective delay line; maximum phase measuring error; maximum range; maximum accuracy
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zheng, Z.; Han, T.; Qin, P. Maximum Measurement Range and Accuracy of SAW Reflective Delay Line Sensors. Sensors 2015, 15, 26643-26653.

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