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Title: Nonperturbing measurements of spatially distributed underwater acoustic fields using a scanning laser Doppler vibrometer
Authors: Harland, Andy R.
Petzing, Jon N.
Tyrer, John R.
Issue Date: 2004
Publisher: © Acoustical Society of America
Citation: HARLAND, A.R., PETZING, J.N. and TRYER, J.R., 2004. Nonperturbing measurements of spatially distributed underwater acoustic fields using a scanning laser Doppler vibrometer. Journal of the Acoustical Society of America, 115 (1), pp. 187–195 [DOI: 10.1121/1.1635841]
Abstract: Localized changes in the density of water induced by the presence of an acoustic field cause perturbations in the localized refractive index. This relationship has given rise to a number of nonperturbing optical metrology techniques for recording measurement parameters from underwater acoustic fields. A method that has been recently developed involves the use of a Laser Doppler Vibrometer (LDV) targeted at a fixed, nonvibrating, plate through an underwater acoustic field. Measurements of the rate of change of optical pathlength along a line section enable the identification of the temporal and frequency characteristics of the acoustic wave front. This approach has been extended through the use of a scanning LDV, which facilitates the measurement of a range of spatially distributed parameters. A mathematical model is presented that relates the distribution of pressure amplitude and phase in a planar wave front with the rate of change of optical pathlength measured by the LDV along a specifically orientated laser line section. Measurements of a 1 MHz acoustic tone burst generated by a focused transducer are described and the results presented. Graphical depictions of the acoustic power and phase distribution recorded by the LDV are shown, together with images representing time history during the acoustic wave propagation.
Description: This article was published in the journal, Journal of the Acoustical Society of America [© Acoustical Society of America] and is also available at: http://asa.aip.org/jasa.html
URI: https://dspace.lboro.ac.uk/2134/3640
ISSN: 0001-4966
Appears in Collections:Published Articles (Mechanical and Manufacturing Engineering)

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