18 April 2017 Three-wavelength phase-shifting interferometry selectively extracting wavelength information from wavelength-multiplexed images with arbitrary symmetric phase shifts
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Proceedings Volume 10251, Biomedical Imaging and Sensing Conference; 1025111 (2017) https://doi.org/10.1117/12.2275149
Event: SPIE Technologies and Applications of Structured Light, 2017, Yokohama, Japan
Abstract
We propose three-wavelength phase-shifting interferometry selectively extracting wavelength information from wavelength-multiplexed images with arbitrary phase shifts. Wavelength information is multiplexed on the space and spatial frequency domains and is separated in the polar coordinate plane by utilizing the proposed phase-shifting interferometry. 0th-order diffraction waves and conjugate images are also removed from wavelength-multiplexed images when extracting wavelengths separately. As a result, a full spatial bandwidth of a monochromatic image sensor at each wavelength is available with a small number of images. Images required for three-wavelength three-dimensional imaging with a full spatial bandwidth of a monochromatic image sensor are decreased and speeding up of measurement is expected in comparison with a conventional technique. The validity of the proposed technique is numerically confirmed.
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Tatsuki Tahara, Reo Otani, Kaito Omae, Yasuhiko Arai, Yasuhiro Takaki, "Three-wavelength phase-shifting interferometry selectively extracting wavelength information from wavelength-multiplexed images with arbitrary symmetric phase shifts", Proc. SPIE 10251, Biomedical Imaging and Sensing Conference, 1025111 (18 April 2017); doi: 10.1117/12.2275149; https://doi.org/10.1117/12.2275149
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