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Non-interferometric methods of phase estimation for application in optical tomography

Datta, Keshava G and Vasu, RM (1999) Non-interferometric methods of phase estimation for application in optical tomography. In: Journal of Modern Optics, 46 (9). pp. 1377-1388.

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We describe here two non-interferometric methods for the estimation of the phase of transmitted wavefronts through refracting objects. The phase of the wavefronts obtained is used to reconstruct either the refractive index distribution of the objects or their contours. Refraction corrected reconstructions are obtained by the application of an iterative loop incorporating digital ray tracing for forward propagation and a modified filtered back projection (FBP) for reconstruction. The FBP is modified to take into account non-straight path propagation of light through the object. When the iteration stagnates, the difference between the projection data and an estimate of it obtained by ray tracing through the final reconstruction is reconstructed using a diffraction tomography algorithm. The reconstruction so obtained, viewed as a correction term, is added to the estimate of the object from the loop to obtain an improved final refractive index reconstruction.

Item Type: Journal Article
Publication: Journal of Modern Optics
Publisher: Taylor and Francis Group
Additional Information: Copyright of this article belongs to Taylor and Francis Group.
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited: 30 Jun 2011 08:49
Last Modified: 30 Jun 2011 08:49
URI: http://eprints.iisc.ac.in/id/eprint/38691

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