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

A. J. Moore, R. McBride, J. S. Barton, J. D C Jones

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


We describe an extension of the active homodyne technique to produce stabilised, p/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 p/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.

Original languageEnglish
Pages (from-to)174-180
Number of pages7
JournalProceedings of SPIE - the International Society for Optical Engineering
Publication statusPublished - 2000
EventOptical Diagnostics for Industrial Applications - Glasgow, UK
Duration: 22 May 200024 May 2000


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