Wireless SAW Sensor Temperature Extraction Precision

    Authors

    L. M. Rodriguez; D. R. Gallagher; M. W. Gallagher; B. H. Fisher; J. R. Humphries;D. C. Malocha

    Comments

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    Abbreviated Journal Title

    IEEE Sens. J.

    Keywords

    SAW; orthogonal frequency coding; passive wireless sensor; precision; performance; SURFACE ACOUSTIC-WAVES; TAGS; Engineering, Electrical & Electronic; Instruments & Instrumentation; Physics, Applied

    Abstract

    Surface acoustic wave (SAW) devices are suitable for use in harsh environments because of their ruggedness under radiation and extreme temperatures and ability to be configured as passive wireless sensors. This orthogonal frequency coded (OFC) sensor system consists of a transceiver that wirelessly interrogates the passive SAW sensor, which can be used in several types of environments. A modified radar equation is presented that can be used to estimate the signal power from the returned sensor signal as a function of practical parameters. The precision performance of the OFC passive wireless sensor, not previously investigated, is shown to be a function of signal-to-noise ratio as expected from an analog sensor; extracted temperature precision better than 0.001 degrees C is reported. Signal integration is an effective means to increase the precision and/or range of the wireless temperature extraction scheme when deciding if the OFC passive wireless sensing scheme will fit a particular application.

    Journal Title

    Ieee Sensors Journal

    Volume

    14

    Issue/Number

    11

    Publication Date

    1-1-2014

    Document Type

    Article

    Language

    English

    First Page

    3830

    Last Page

    3837

    WOS Identifier

    WOS:000346963700012

    ISSN

    1530-437X

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