Polarization-based fringe projection interferometer for phase-stepping techniques

Piotr Szwaykowski

doi:10.1117/12.250751

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18 September 1996 Polarization-based fringe projection interferometer for phase-stepping techniques

Piotr Szwaykowski

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Proceedings Volume 2782, Optical Inspection and Micromeasurements; (1996) https://doi.org/10.1117/12.250751
Event: Lasers, Optics, and Vision for Productivity in Manufacturing I, 1996, Besancon, France

Abstract

We present newly developed, compact, self-contained fringe projection interferometer for use with phase step algorithms. The interferometer uses a polarization beam splitter and a computer controlled variable retarder to manage the phase shift. The well compensated path difference permits use of relatively low-coherence sources. The in-line setup contains no mechanical parts and provides a compact, rigid design and nearly perfect common path geometry. The phase shift is realized in a few milliseconds, which enables fast data collection. The interferometer can be used as a sinusoidal fringe projector for topography measurements, or as a shearing interferometer for testing optical elements. Other applications that use phase step technique and require similarly short data acquisition times, versatility and stability are also possible. Examples of surface topography measurements are presented.

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Piotr Szwaykowski "Polarization-based fringe projection interferometer for phase-stepping techniques", Proc. SPIE 2782, Optical Inspection and Micromeasurements, (18 September 1996); https://doi.org/10.1117/12.250751

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KEYWORDS

Interferometers

Phase interferometry

Algorithm development

Phase shifts

Beam splitters

Optical testing

Polarization

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