Phase-crossing algorithm for white-light fringes analysis |
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Authors: | Micha? E Paw?owski Youhei Sakano Yoko Miyamoto Mitsuo Takeda |
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Institution: | The University of Electro-Communications, Department of Information and Communication Engineering, Laboratory for Information Photonics and Wave Signal Processing, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan |
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Abstract: | The phase-crossing algorithm is proposed for white-light interferometry, which uses the multi-color phase information of spectrally decomposed interferograms recorded simultaneously with color-sensitive image sensors. The location of zero optical path difference is identified as the singular point at which the phase becomes color invariant, and is determined accurately with a sub-sampling-interval resolution from the crossing point of the multi-color phase distributions obtained by the Fourier transform method. An experimental result is presented that demonstrates the performance of the phase-crossing algorithm. |
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