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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Multiplicative phase-shifting interferometry using optical flow.

J Vargas¹, J Antonio Quiroga, C O S Sorzano

¹Biocomputing Unit, Centro Nacional de Biotecnología-CSIC, C/ Darwin 3, 28049, Cantoblanco (Madrid), Spain. jvargas@cnb.csic.es

|August 22, 2012

Summary

This summary is machine-generated.

Standard phase-shifting methods fail for fringe patterns with multiplicative phase shifts. A new multiframe regularized optical flow algorithm successfully extracts the modulating phase from these complex patterns in photoelasticity and shadow moiré.

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Area of Science:

Optical metrology
Image processing

Background:

Fringe patterns with multiplicative phase shifts are common in photoelasticity and RGB shadow moiré.
Standard phase-shifting techniques are inadequate for analyzing these patterns.

Purpose of the Study:

To propose and validate a novel algorithm for processing fringe patterns with multiplicative phase shifts.
To extract the modulating phase from complex interferograms.

Main Methods:

Development of a multiframe regularized optical flow algorithm.
Application of the algorithm to simulated and experimental interferograms.

Main Results:

The proposed optical flow algorithm effectively obtains the modulating phase.
Satisfactory results were achieved on both simulated and experimental data.

Conclusions:

Multiframe regularized optical flow is a viable technique for analyzing fringe patterns with multiplicative phase shifts.
This method overcomes limitations of standard phase-shifting demodulation.