Constant-frequency pulsed phase-locked-loop measuring device is sensitive to small changes in phase velocity and easily automated. Based on use of fixed-frequency oscillator in measuring small changes in ultrasonic phase velocity when sample exposed to such changes in environment as changes in pressure and temperature. Automatically balances electrical phase shifts against acoustical phase shifts to obtain accurate measurements of acoustical phase shifts.


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    Titel :

    Constant-Frequency Pulsed Phase-Locked-Loop Measuring Device


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    1992-04-01



    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch


    Schlagwörter :


    Pulsed Phase-Locked-Loop Strain Monitor

    Heyman, J. S. / Stone, F. D. | NTRS | 1982


    Double-Referenced, Pulsed, Phase-Locked Loop - DRP2L2

    Heyman, J. S. / Stone, F. D. | NTRS | 1987




    The frequency locked loop

    Clarke, K. K. / Tepedelenlioglu, N. / Unkauf, M. | NTRS | 1967