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Broadband tomographic imaging with a circular array

Vasuki, A and Naidu, PS (1998) Broadband tomographic imaging with a circular array. In: Acoustics Letters, 21 (7). pp. 144-150.

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Abstract

We describe a new approach to imaging an object profile using the scattered wavefield. The object is illuminated by broadband radiation and the scattered field is received by a circular array of sensors encircling the object. The notable findings are: Firstly, since the measured scattered field is proportional to the object Fourier transform, errors due to finite Fourier transformation may be avoided, resulting in a better reconstruction. Secondly, a circular array allows us to use the object Fourier transform over a much larger pass disc than a linear array would allow. As a result, we obtain a sharper reconstruction for the same number of receivers and illuminations. Thirdly, with broadband radiation a reduction in the number of illuminations can been achieved. For example, it is demonstrated that with just four illuminations we can cover more than 80% of the pass disc. Thus, a trade-off can be made between the bandwidth and the number of illuminations.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to INIST-CNRS.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 12 Dec 2006
Last Modified: 27 Aug 2008 12:26
URI: http://eprints.iisc.ernet.in/id/eprint/8969

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