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Spatial–temporal phase demodulation decoding superimposed ghost reflections in optical testing

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Abstract

We introduce a method of phase demodulation to distinguish the ghost reflection commonly observed in optical testing. The method digitally processes a sequence of fringe patterns to separate the reflections from the front and rear surfaces. First, we use a phase-shifting algorithm to compute an analytic signal with the two reflections coupled, and then we decouple them through a maximized spatial filtering. The process requires the acquisition of at least three fringe patterns, as well as fulfilling opposite signs for the magnifications of the two reflections. We demonstrate the decoding process through a real phase measuring deflectometry data processing example.

© 2022 Optica Publishing Group

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Supplementary Material (1)

NameDescription
Supplement 1       Extra data process results

Data availability

Data underlying the results presented in this Letter are not publicly available at this time but may be obtained from the authors upon reasonable request.

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