Windowed high-order ambiguity function method for fringe analysis.
This paper introduces a windowed high-order ambiguity function (WHAF) method for the demodulation of fringe patterns recorded in holographic interferometry. It first obtains the analytic signal of the fringe pattern and models it as a piecewise polynomial phase signal. A parametric estimation procedure based on HAF is then employed to calculate the polynomial coefficients of the phase over each window of the segmented analytic signal. A salient feature of the proposed method is that it provides an accurate and direct estimation of the unwrapped phase distribution from a single fringe pattern, even when the pattern's phase is rapidly varying. WHAF's application to both digital and classical holographic interferometry is demonstrated by simulation and experimental results.
Gorthi
Sai Siva
SS
Applied Computing and Mechanics Laboratory, IMAC IS ENAC EPFL, Swiss Federal Institute of Technology, 1015 Lausanne, Switzerland.
Rastogi
Pramod
P