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Pubmed for Handhelds

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  • Title: Maximum accuracy evaluation scheme for wireless saw delay-line sensors.
    Author: Kuypers JH, Reindl LM, Tanaka S, Esashi M.
    Journal: IEEE Trans Ultrason Ferroelectr Freq Control; 2008 Jul; 55(7):1640-52. PubMed ID: 18986954.
    Abstract:
    This paper describes an evaluation scheme that prevents phase ambiguity of surface acoustic wave (SAW) delay-line sensors. Although it is well-known that phase evaluation yields accuracies of 150~1500 times higher than time-delay evaluation, the problem of phase ambiguity has prevented phase evaluation of sensors operating over a range larger than 2 pi. This paper addresses this unsolved problem with a complete strategy. Furthermore, the existence of an optimum choice of the relative reflector positions on the sensor is shown. The presented relations enable the design of maximum accuracy SAW delay-line sensors.
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