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Optical Engineering

Sensitivity enhancement of far-infrared Fizeau interferometry by digital image processing
Author(s): Kaushal Verma; Bongtae Han
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Paper Abstract

The applicability of digital image-processing techniques is studied to enhance the displacement resolution of far-IR Fizeau interferometry (FIFI). Two image-processing techniques are considered-the optical/digital fringe multiplication (O/DFM) method and the phasestepping method. The effect of multiple reflections on the fractional fringe order is analyzed mathematically and the results are verified by experimental data. The results indicate that the O/DFM method is fully compatible with the complex asymmetric intensity distribution produced by FIFI, while the phase-stepping method yields significant errors in fractional fringe orders when the surface reflectivity is high. The errors are quantified to provide an application guideline for the phase-stepping method.

Paper Details

Date Published: 1 September 2001
PDF: 8 pages
Opt. Eng. 40(9) doi: 10.1117/1.1391436
Published in: Optical Engineering Volume 40, Issue 9
Show Author Affiliations
Kaushal Verma, Clemson Univ. (United States)
Bongtae Han, Univ. of Maryland/College Park (United States)

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