A line array based near field imaging technique for characterising acoustical properties of elongated targets
conference paper
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
properties, such as Target Strenth, without the severe limitations of far field measurements. Measuring on a single line simplifies the measurement substantially in terms of acquisition time, amount of acquisition data, and measurement setup. Simulations as well as measurements on different size scale models have shown the use, practicability, and importance of the technique.
properties, such as Target Strenth, without the severe limitations of far field measurements. Measuring on a single line simplifies the measurement substantially in terms of acquisition time, amount of acquisition data, and measurement setup. Simulations as well as measurements on different size scale models have shown the use, practicability, and importance of the technique.
TNO Identifier
489569
Publisher
Nexus Media Ltd
Source title
UDT 1995 - Conference Proceedings Undersea Defence Technology, Cannes, France, 4-6 July 1995
Place of publication
Swanley, Kent
Pages
509-513
Files
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