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Proceedings Paper

Real-time speckle interferometry fringe analysis system
Author(s): C. R. Coggrave; Jonathan Mark Huntley
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Paper Abstract

A real-time system for analyzing data from speckle interferometers, and speckle shearing interferometers, is presented. Interferograms are recorded by a CCD camera at a rate of 60 frames s-1, with temporal phase shifting carried out at the same rate by means of a PZT-mounted prism in the reference beam. The images are analyzed using a pipeline image processor consisting of two Datacube MaxVideo 250 VME boards. With a standard 4-frame phase-shifting algorithm, wrapped phase maps are calculated at 15 frames s-1; these are then unwrapped in real time using a temporal phase unwrapping algorithm. The main advantage of temporal over spatial unwrapping methods is that unwrapping errors due to noise and specimen boundaries do not propagate spatially. Pseudo-color maps of displacement distribution are displayed throughout the measurement period in real time. The paper is illustrated by application of the technique to the rigid body motion of a flat plate under controlled conditions.

Paper Details

Date Published: 13 August 1999
PDF: 10 pages
Proc. SPIE 3744, Interferometry '99: Techniques and Technologies, (13 August 1999); doi: 10.1117/12.357748
Show Author Affiliations
C. R. Coggrave, Loughborough Univ. (United Kingdom)
Jonathan Mark Huntley, Loughborough Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 3744:
Interferometry '99: Techniques and Technologies
Malgorzata Kujawinska; Mitsuo Takeda, Editor(s)

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