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RESEARCH PAPERS: Noise Control and Acoustics

Aperture Effects in Planar Nearfield Acoustical Imaging

[+] Author and Article Information
S. I. Hayek

The Department of Engineering Science and Mechanics and The Applied Research Laboratory

T. W. Luce

The Graduate Program in Acoustics, The Pennsylvania State University, University Park, PA 16802

J. Vib., Acoust., Stress, and Reliab 110(1), 91-96 (Jan 01, 1988) (6 pages) doi:10.1115/1.3269486 History: Received September 18, 1987; Online November 23, 2009

Abstract

The influence of the size of the measurement aperture on the accuracy of reconstruction of the pressure and vector velocity fields using underwater nearfield acoustical holography technique is examined. In this measurement technique, the amplitude and phase of the pressure in the nearfield of a planar structure submerged in water is measured at a set of points on a planar surface which constitute the measurement aperture. The reconstruction of the pressure and velocity vector fields on the surface of a vibrating submerged steel plate was found to be insensitive to the aperture size down to the size of the structure. Examples of aperture sizes ranging from six (6) times down to 1/2 of the size vibrating steel plate are shown. Thus, the total length of time spent on measurements underwater can be drastically reduced.

Copyright © 1988 by ASME
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