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Related Experiment Videos

A multiple-frequency hydrophone calibration technique.

R A Smith1, D R Bacon

  • 1Division of Radiation Science and Acoustics, National Physical Laboratory, Teddington, Middlesex, United Kingdom.

The Journal of the Acoustical Society of America
|May 1, 1990
PubMed
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A new method compares hydrophone sensitivity from 1-15 MHz using a broadband ultrasonic field. This technique ensures accurate dissemination of UK ultrasonic standards with minimal uncertainty.

Area of Science:

  • Acoustics
  • Metrology
  • Ultrasonics

Background:

  • Accurate hydrophone sensitivity calibration is crucial for ultrasonic standards dissemination.
  • Existing methods may require multiple measurements or specialized equipment.
  • A need exists for an efficient and reliable comparison technique across a broad frequency range.

Purpose of the Study:

  • To describe and validate a novel method for comparing hydrophone sensitivity.
  • To establish a basis for disseminating national ultrasonic standards in the UK.
  • To assess the uncertainty associated with the proposed comparison technique.

Main Methods:

  • A substitution method utilizing a broadband ultrasonic field generated by nonlinear propagation.
  • A reference hydrophone is used, and the device under calibration is substituted in the same ultrasonic field.

Related Experiment Videos

  • Output voltages from both hydrophones are compared to determine sensitivity differences.

    • Main Results:

    • The method covers the entire 1-15 MHz frequency range with single measurements per hydrophone.
    • Overall uncertainty increases from +/- 4.2% at 1 MHz to +/- 8.2% at 15 MHz (95% confidence).
    • Agreement with discrete-frequency substitution, time-delay spectrometry, and laser interferometer calibrations was within combined random uncertainties.

    Conclusions:

    • The described substitution method provides a reliable and efficient means for comparing hydrophone sensitivity.
    • This technique is suitable for the dissemination of UK national ultrasonic standards.
    • The method demonstrates good agreement with established calibration techniques across various hydrophone types.