Wideband measurement of acoustic scattering from a cylindrical shell using a parametric array

Wang, Lian Sheng, Humphrey, Victor, Menon, Raghav, Stacey, Phil and Lepper, Paul (2009) Wideband measurement of acoustic scattering from a cylindrical shell using a parametric array. Papdakis, J.S. and Bjorno, L. (eds.) Third International Conference on Underwater Acoustic Measurements, Technologies and Results, Nafplion, Greece. 20 - 25 Jun 2009. 8 pp .

Abstract

An experiment to measure the backscattering from a partially water-filled cylindrical shell of mild steel using a parametric array has been performed at the National Physical Laboratory (NPL) facility on Wraysbury reservoir. The purpose of the experiment was to obtain information on the frequency responses of the target for different angles of incidence, over a wide frequency range, for comparison with theoretical and numerical predictions. A parametric array system developed by Loughborough University was used for the experiment. The transmitting transducer was a square planar array with a centre frequency of 75 kHz; a number of secondary waveforms were generated, including tone bursts, Ricker pulses and frequency chirps. The target used in the experiment was 1.4 m long with hemispherical ends, and had a radius of 0.28 m and a wall thickness of 4 mm. Overall the response was measured at secondary frequencies from 2 to 24 kHz and primary frequencies from 63 to 87 kHz. Some measured results in terms of the time and frequency responses as a function of angle of incidence are presented here

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Contributors

Author: Victor Humphrey

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