A simplified system for digital speckle interferometry

A video speckle interferometer has been demonstrated which uses a spherical surface of small radius at the centre of the camera aperture to simplify the alignment of the reference beam. In combination with a fast microcomputer, this gives a compact and relatively inexpensive system which is able to...

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Bibliographic Details
Published in:Optics and laser technology 1990-10, Vol.22 (5), p.311-316
Main Authors: Virdee, M.S., Williams, D.C., Banyard, J.E., Nassar, N.S.
Format: Article
Language:English
Subjects:
digital speckle interferometry
Exact sciences and technology
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
phase unwrapping
Physics
signal processing
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Summary:A video speckle interferometer has been demonstrated which uses a spherical surface of small radius at the centre of the camera aperture to simplify the alignment of the reference beam. In combination with a fast microcomputer, this gives a compact and relatively inexpensive system which is able to display phase-stepped interferograms of good quality with a repetition rate approaching one second. The software for phase stepping and unwrapping has novel features and can be applied to other types of interferometer.
ISSN:0030-3992
1879-2545
DOI:10.1016/0030-3992(90)90072-C