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Proceedings Paper

Shape measurement using a fiber optic fringe projector with active homodyne phase stepping
Author(s): Andrew John Moore; Roy McBride; James S. Barton; Julian D. C. Jones
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Paper Abstract

We describe an extension of the active homodyne technique to produce stabilised, (pi) /2 radian phase steps in a full-field interferometer. We have implemented the technique in a single mode fibre optic fringe- projector for shape measurement. The interference intensity (and hence phase) is maintained constant by feedback control to a phase modulator in one of the fibre arms. The feedback system has been modified to produce (pi) /2 radian phase steps in the projected fringes. The phase stability and accuracy of each step was measured to be 17 milliradians in a 50 Hz bandwidth. The technique can be used to produce stabilised phase-stepped images in any fibre or bulk optic interferometer where active homodyne feedback control can be implemented.

Paper Details

Date Published: 31 August 2000
PDF: 7 pages
Proc. SPIE 4076, Optical Diagnostics for Industrial Applications, (31 August 2000); doi: 10.1117/12.397945
Show Author Affiliations
Andrew John Moore, Heriot-Watt Univ. (United Kingdom)
Roy McBride, Heriot-Watt Univ. (United Kingdom)
James S. Barton, Heriot-Watt Univ. (United Kingdom)
Julian D. C. Jones, Heriot-Watt Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 4076:
Optical Diagnostics for Industrial Applications
Neil A. Halliwell, Editor(s)

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