Pseudo-phase information of complex analytic signal of speckle fields and its applications: micro-displacement measurement based on phase-only correlation in signal domain

摘要

As an alternative to the intensity correlation technique used in conventional speckle metrology, we propose a new technique of displacement measurement based on spatial signal-domain phase-only correlation that makes use of the pseudo phase 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 the conventional intensity correlation technique.