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Related Experiment Videos

Transducer transmitting sensitivity measurements in restricted environments

Everitt1, Humphrey

  • 1Department of Physics, University of Bath, UK. pypsje@bath.ac.uk

Ultrasonics
|June 1, 2000
PubMed
Summary

A new method calibrates transducer transmitting sensitivity in reverberant tanks, overcoming limitations of traditional free-field measurements for high-Q, low-frequency projectors. This technique accurately determines sensitivity even with reflected sound waves present.

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Area of Science:

  • Acoustics
  • Transducer Technology
  • Metrology

Background:

  • Transducer transmitting sensitivity is typically measured under free-field conditions.
  • Laboratory tank measurements often use time gating, which is insufficient for high-Q, low-frequency projectors due to short free-time availability.
  • Reflected signals in laboratory tanks complicate accurate sensitivity measurements.

Purpose of the Study:

  • To develop and assess a novel measurement technique for transducer transmitting sensitivity in reverberant fields.
  • To overcome the limitations of time gating for high-Q, low-frequency projectors in laboratory tanks.
  • To determine the accuracy of the new technique by comparing results with free-field sensitivity at ultrasonic frequencies.

Main Methods:

  • Developed a technique to extract the direct acoustic field from a combination of direct and reverberant fields.

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  • Utilized plotting the variation of pressure squared against the reciprocal of separation squared.
  • Investigated the influence of tank size, construction, and bandwidth averaging on the technique's performance.

    • Main Results:

    • The gradient of the pressure squared vs. reciprocal separation squared plot is proportional to the acoustic power radiated.
    • Direct field pressure and projector sensitivity can be calculated from the gradient.
    • The technique was validated at ultrasonic frequencies to assess its accuracy.

    Conclusions:

    • The developed technique enables accurate transducer transmitting sensitivity measurements in reverberant fields.
    • This method provides a viable alternative to free-field measurements for challenging projector types.
    • Further investigation into tank parameters and bandwidth effects confirms the technique's robustness.