Shape measurement using a fiber optic fringe projector with active homodyne phase stepping

Andrew John Moore; Roy McBride; James S. Barton; Julian D. C. Jones

doi:10.1117/12.397945

31 August 2000 Shape measurement using a fiber optic fringe projector with active homodyne phase stepping

Andrew John Moore, Roy McBride, James S. Barton, Julian D. C. Jones

Proceedings Volume 4076, Optical Diagnostics for Industrial Applications; (2000) https://doi.org/10.1117/12.397945
Event: Symposium on Applied Photonics, 2000, Glasgow, United Kingdom

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.

Citation Download Citation

Andrew John Moore, Roy McBride, James S. Barton, and Julian D. C. Jones "Shape measurement using a fiber optic fringe projector with active homodyne phase stepping", Proc. SPIE 4076, Optical Diagnostics for Industrial Applications, (31 August 2000); https://doi.org/10.1117/12.397945

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