Influence of electrical source impedance on phase shift of sound wave in the ultrasonic velocity measurement

Daizo Sasaki, Kazuhiko Imano, Hiroshi Inoue

    Research output: Contribution to journalArticlepeer-review


    In acoustic velocity measurement using ultrasonic waves, the composite resonator method with the sample and the transducer becomes a source of error. This phenomenon is considered as a phase shift at the boundary between the transducer and the sample and is analyzed by numerical simulation. From the result, it is found that the phase shift depends on the electrical source impedance and that the phase shift can be minimized by setting the electrical source impedance equal to the reactance of the transducer at resonance, depending on the acoustic condition of the backing of the transducer. The results of experiments with a varying electrical source impedance are found to be similar to those of simulations. Further, it becomes possible to measure the acoustic velocity of water with a discrepancy of less than 0.1% from the referenced value if the phase shift is eliminated by taking the propagation time difference in two samples with different lengths.

    Original languageEnglish
    Pages (from-to)41-48
    Number of pages8
    JournalElectronics and Communications in Japan, Part II: Electronics (English translation of Denshi Tsushin Gakkai Ronbunshi)
    Issue number4
    Publication statusPublished - 2001 Apr 1


    • Acoustic velocity
    • Continuous wave
    • Electrical source impedance
    • Phase shift
    • Piezoelectric transducer

    ASJC Scopus subject areas

    • Physics and Astronomy(all)
    • Computer Networks and Communications
    • Electrical and Electronic Engineering


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