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A line array based near field imaging technique for characterising acoustical properties of elongated targets

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Author: Driessen, F.P.G.
Type:article
Date:1995
Publisher: Nexus Media Ltd
Place: Swanley, Kent
Institution: Technisch Physische Dienst TNO - TH
Source:UDT 1995 - Conference Proceedings Undersea Defence Technology, Cannes, France, 4-6 July 1995, 509-513
Identifier: 489569
Keywords: Marine

Abstract

With near field imaging techniques the acoustical pressure waves at distances other than the recorded can be calculated. Normally, acquisition on a two dimensional plane is necessary and extrapolation is performed by a Rayleigh integral. A near field single line instead of two dimensional plane acquisition technique is developed for acoustical imaging of elongated objects. With this technique, based on the stationary phase method, extrapolation of the pressure wave field is performed by a Rayleigh-type integral. When extrapolating the recorded field to the far field, the method can be used to determine far field