Maximum accuracy evaluation scheme for wireless SAW delay-line sensors

Jan H. Kuypers, Leonhard M. Reindl, Shuji Tanaka, Masayoshi Esashi

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


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 2π. 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.

Original languageEnglish
Article number4559662
Pages (from-to)1640-1652
Number of pages13
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Issue number7
Publication statusPublished - 2008 Jul


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