Fast calculation of phase in spatial n-point phase-shifting techniques

Joanna Schmit; Katherine Creath

doi:10.1117/12.211855

14 June 1995 Fast calculation of phase in spatial n-point phase-shifting techniques

Joanna Schmit, Katherine Creath

Proceedings Volume 2544, Interferometry VII: Techniques and Analysis; (1995) https://doi.org/10.1117/12.211855
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

The n-point technique (also called the spatial carrier phase-shifting technique) is one of a few fringe pattern analysis techniques. We present modified algorithms for the n-point technique from which the phase modulo 2(pi) can be calculated in a much shorter time versus conventional algorithms. The algorithms are based on spatial synchronous detection techniques, and by analogy to those techniques, the modified algorithms are named low-pass algorithms, as opposed to the convention 'high-pass' algorithms in the n-point technique.

Citation Download Citation

Joanna Schmit and Katherine Creath "Fast calculation of phase in spatial n-point phase-shifting techniques", Proc. SPIE 2544, Interferometry VII: Techniques and Analysis, (14 June 1995); https://doi.org/10.1117/12.211855

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