A comparison of hydrophone near-field scans and optical techniques for characterising high frequency sonar transducers.

A comparison of hydrophone near-field scans and optical techniques for characterising high frequency sonar transducers. Research Abstract Details 

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A comparison of hydrophone near-field scans and optical techniques for characterising high frequency sonar transducers. Abstract Text:

Two potential methods of fully characterising the response of high frequency sonar transducers and arrays operating in the frequency range 100 kHz to 500 kHz are compared. In the first approach two-dimensional planar scans, with a spatial resolution of better than half a wavelength, are performed in the acoustic near-field using a small probe hydrophone. The measured two-dimensional data are propagated numerically using a Fourier Transform method to predict the far-field response. Alternatively the data can be back-propagated to re-construct the pressure distribution at the source, a powerful diagnostic technique which can identify defects in transducers and array elements. The second approach uses a scanning laser vibrometer to measure the velocity of the transducer surface; with the resulting velocity data also being used to predict the far-field response by numerical propagation. The two approaches are compared for a number of devices. Comparison of the propagated hydrophone near-field scan data with direct measurements at these ranges shows very good agreement, indicating the usefulness of the method for deriving far-field transducer responses from near-field measurements in laboratory tanks. The potential limitations introduced to the optical approach by the acousto-optic effect are discussed.

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A comparison of hydrophone near-field scans and optical techniques for characterising high frequency sonar transducers. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The Journal of the Acoustical Society of America

VOLUME: 123

Page Numbers: 3436

Journal Abbreviation: J. Acoust. Soc. Am.

ISSN: 1520-8524

DAY: 5

MONTH: May

YEAR: 2008

A comparison of hydrophone near-field scans and optical techniques for characterising high frequency sonar transducers. Information

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LANGUAGE: eng

NlmUniqueID: 7503051

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Grant and Affiliation Information for A comparison of hydrophone near-field scans and optical techniques for characterising high frequency sonar transducers.

AFFILIATION: Institute of Sound and Vibration, Univ. of Southampton, University Road, Highfield, SO17 1BJ Southampton, UK, vh@isvr.soton.ac.uk.

Country: United States

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MEDLINETA: J Acoust Soc Am

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