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Optical Engineering

Centering and profiling algorithm for processing Newton's rings fringe patterns
Author(s): Adrian Dobroiu; Adrian Alexandrescu; Dan Apostol; Victor Nascov; Victor S. Damian
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Paper Abstract

We present a new algorithm for processing the particular fringe patterns known as Newton’s rings. The first step of the algorithm consists of finding the common center of the circular fringes using a blockwise Fourier transform of the interferogram. The directions perpendicular to the fringes in several zones are thus detected and combined to give the circles’ center. As a second step, a specially adapted type of pixel intensity spectrum is calculated, in which the 2-D pattern is reduced to a 1-D profile showing a periodic structure of fringes. By further processing, the parameters of the initial interferogram can be easily extracted. The statistical nature of the algorithm (achieved by taking into account all pixel intensities) leads to a high accuracy and a good immunity to noise.

Paper Details

Date Published: 1 December 2000
PDF: 6 pages
Opt. Eng. 39(12) doi: 10.1117/1.1327836
Published in: Optical Engineering Volume 39, Issue 12
Show Author Affiliations
Adrian Dobroiu, Natl. Inst. for Laser, Plasma & Radiation Physics (Romania)
Adrian Alexandrescu, Politehnica Univ. of Bucharest (Romania)
Dan Apostol, Natl. Inst. for Laser, Plasma and Radiation Physic (Romania)
Victor Nascov, Institute of Atomic Physics (Romania)
Victor S. Damian, Institute of Atomic Physics (Romania)

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