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Proceedings Paper

Laser-diode joint-transform correlator with a digital interferometric technique
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Paper Abstract

A new method for joint-transform correlator (JTC) is presented in which complex amplitudes of joint power spectrum (JPS) of two inputs are measured by the six-step phase-shifting interferometry with a wavelength-shifted laser diode (LD). A phase calculation is immune to the changes in LD power. A joint-transform phase correlator JTPC) is demonstrated with a single centered correlation by the numerical Fourier transformation of a measured phase in an on-axis JPS. Multiple-object recognition by a JTPC is performed to eliminate the correlation between input targets. The experimental results with a JTPC are shown, exhibiting sharp correlation peak.

Paper Details

Date Published: 8 May 2001
PDF: 4 pages
Proc. SPIE 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), (8 May 2001); doi: 10.1117/12.427060
Show Author Affiliations
Yukihiro Ishii, Univ. of Industrial Technology (Japan)
Takeshi Takahashi, Univ. of Industrial Technology (Japan)

Published in SPIE Proceedings Vol. 4416:
Optical Engineering for Sensing and Nanotechnology (ICOSN 2001)
Koichi Iwata, Editor(s)

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