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Optical Engineering

Adaptive filter algorithms for interference patterns of diffusion measurements
Author(s): Erik Marquardt; Norbert Grosser; Joachim Richter
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Paper Abstract

A holographic interferometer is used to measure diffusion coefficients of binary molten salt mixtures. The composition of such transparent mixtures is proportional to the refractive index. The composition changes cause local variations of the refractive index during diffusion. These variations are visualized by interference fringes, which are photographed by a CCD camera. Exact detection of the intensity extreme values of the fringes is essential to calculate diffusion coefficients. As irregular illumination and noise disturb the detection, adaptive filter algorithms are applied to reduce noise sufficiently while maintaining all relevant information.

Paper Details

Date Published: 1 October 1997
PDF: 6 pages
Opt. Eng. 36(10) doi: 10.1117/1.601514
Published in: Optical Engineering Volume 36, Issue 10
Show Author Affiliations
Erik Marquardt, RWTH Aachen (Germany)
Norbert Grosser, RWTH Aachen (Germany)
Joachim Richter, RWTH Aachen (Germany)

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