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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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 |
|---|---|
| Publication: | Acoustics Letters |
| Publisher: | INIST-CNRS |
| 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.ac.in/id/eprint/8969 |
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