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Laser-Diode Phase-Shifting Joint-Transform Correlator with Multiple-Object Recognition

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Abstract

A joint-transform phase correlation is made by an extracted phase from the joint power spectrum using a phase-shifting Mach-Zehnder interferometer with a wavelength-shifted laser diode (LD), and then by numerically Fourier-transforming a measured phase. The algorithm in six steps is insensitive to the power changes in an LD. The phase correlator gives the best discrimination performance. Discriminative multiple-object recognition is performed with no intermodulation noise and artifact noise-free correlation by arranging the multiple objects in a regularly equal-spaced array. The experimental and numerical results are shown.

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Authors and Affiliations

  1. Department of Applied Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan

    Yukihiro Ishii

  2. Department of Electronic System Engineering, University of Industrial Technology, 4-1-1 Hashimotodai, Sagamihara, Kanagawa, 229-1196, Japan

    Takeshi Takahashi

Authors
  1. Takeshi Takahashi
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  2. Yukihiro Ishii
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Correspondence to Takeshi Takahashi or Yukihiro Ishii.

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Takahashi, T., Ishii, Y. Laser-Diode Phase-Shifting Joint-Transform Correlator with Multiple-Object Recognition. OPT REV 13, 53–63 (2006). https://doi.org/10.1007/s10043-006-0053-2

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  • DOI: https://doi.org/10.1007/s10043-006-0053-2

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