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Sensors 2013, 13(5), 5897-5922;

A Passive Wireless Multi-Sensor SAW Technology Device and System Perspectives

Electrical Engineering & Computer Science Department, University of Central Florida, Orlando, FL 32816, USA
Current address: Mnemonics Inc., Melbourne, Fl 32934, USA.
Author to whom correspondence should be addressed.
Received: 10 March 2013 / Revised: 18 April 2013 / Accepted: 24 April 2013 / Published: 10 May 2013
(This article belongs to the Special Issue Piezoelectric Sensors and Actuators)
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This paper will discuss a SAW passive, wireless multi-sensor system under development by our group for the past several years. The device focus is on orthogonal frequency coded (OFC) SAW sensors, which use both frequency diversity and pulse position reflectors to encode the device ID and will be briefly contrasted to other embodiments. A synchronous correlator transceiver is used for the hardware and post processing and correlation techniques of the received signal to extract the sensor information will be presented. Critical device and system parameters addressed include encoding, operational range, SAW device parameters, post-processing, and antenna-SAW device integration. A fully developed 915 MHz OFC SAW multi-sensor system is used to show experimental results. The system is based on a software radio approach that provides great flexibility for future enhancements and diverse sensor applications. Several different sensor types using the OFC SAW platform are shown. View Full-Text
Keywords: surface acoustic wave; RFID; sensor; spread spectrum surface acoustic wave; RFID; sensor; spread spectrum
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Malocha, D.C.; Gallagher, M.; Fisher, B.; Humphries, J.; Gallagher, D.; Kozlovski, N. A Passive Wireless Multi-Sensor SAW Technology Device and System Perspectives. Sensors 2013, 13, 5897-5922.

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