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Transducer transmitting sensitivity measurements in restricted environments

Everitt¹, Humphrey

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

|June 1, 2000

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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.

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.