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

Sensors

Donald C. Malocha¹  Mark Gallagher²  Brian Fisher²  James Humphries²  Daniel Gallagher² 

[1] Electrical Engineering & Computer Science Department, University of Central Florida, Orlando, FL 32816, USA;

关键词: surface acoustic wave;    RFID;    sensor;    spread spectrum;   

DOI  :  10.3390/s130505897

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.