Complex phase tracing method for fringe pattern analysis

Abstract

We present what we believe to be a novel complex phase tracing method for fringe pattern analysis related to the phase-locked loop idea. The image with deformed complex fringes is analyzed with lexicographic scansion that leads directly to the investigated phase without unwrapping. Robustness of the procedure is ensured by the delay mechanism in the process of calculating the reference value. A numerical model and examples of application of the presented method are given.

Review of Quantitative Evaluation of Materials Stress Response by Optical Methods

“…A different method uses a Phase Locked Loop (PLL) technique [25,26) to track the local frequency, thus retrieving the phase information. A PLL is essentially a narrow band-pass filter, commonly used for temporal signals, that automatically tunes to the local frequency by means of a feedback loop that controls a reference oscillator.…”

FACE: facial automaton for conveying emotions

“…Our approach uses a different technique; it is based on the AV system, realised using a CCD camera and a fringe pattern analysis (Kozlowski and Serra 1999). A curvature map and a 3D mesh of the head of a subject are calculated from images acquired with the camera.…”

Regularized quadrature and phase tracking from a single closed-fringe interferogram

“…In Subsection 2.A we review the phase-locked loop (PLL), [9][10][11] which is the first one-dimensional (1D) sequential phase demodulator used to analyze 2D interferograms, because an important idea that is used in the RQPT is drawn directly from the PLL system. The motivation for a nonregularized quadrature and phase tracker (QPT) demodulation system in one dimension is presented in Subsection 2.B.…”