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Proceedings Paper

Fibre optic shape-measuring system using phase-stepping speckle-pattern interferometry
Author(s): Lewis S. Wang; Brian N. Dobbins; K. Jambunathan; Xiaoping Wu
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Paper Abstract

A non-contact shape measuring system using fiber optics and digital speckle pattern interferometry (DSPI) is described. Fringe patterns for obtaining the height distributions of the shape are generated by traversing one of the illumination beams. The system utilizes a 4-step phase stepping algorithm to perform the data reduction. A semi-automatic procedure for calibrating the piezoelectric phase shifting device is reported. The equations for calculating the surface height are stated and typical results for two specimens are shown. Advantages and limitations of the technique and the optical system used are discussed.

Paper Details

Date Published: 1 February 1993
PDF: 7 pages
Proc. SPIE 2088, Laser Dimensional Metrology: Recent Advances for Industrial Application, (1 February 1993); doi: 10.1117/12.168060
Show Author Affiliations
Lewis S. Wang, Nottingham Trent Univ. (United Kingdom)
Brian N. Dobbins, Nottingham Trent Univ. (United Kingdom)
K. Jambunathan, Nottingham Trent Univ. (United Kingdom)
Xiaoping Wu, Univ. of Science and Technology of China (China)

Published in SPIE Proceedings Vol. 2088:
Laser Dimensional Metrology: Recent Advances for Industrial Application
Michael J. Downs, Editor(s)

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