Pseudophase information from the complex analytic signal of speckle fields and its applications. Part I: microdisplacement observation based on phase-only correlation in the signal domain.
As an alternative to the intensity correlation used in conventional speckle metrology, we propose a new technique for displacement observation that is based on spatial-signal-domain phase-only correlation and that makes use of the pseudophase of the complex analytic signal generated from a Hilbert-filtered speckle pattern. Experimental results are presented that demonstrate the validity and the advantage of the proposed signal-domain phase-only correlation technique over both the conventional intensity correlation technique and the spatial-frequency-domain phase-only correlation technique.
Wang
Wei
W
Department of Information and Communication Engineering, Laboratory for Information Photonics and Wave Signal Processing, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan. weiwang@ice.uec.ac.jp
Ishii
Nobuo
N
Hanson
Steen G
SG
Miyamoto
Yoko
Y
Takeda
Mitsuo
M