Multiple phase derivative estimation using autoregressive modeling in holographic interferometry

Abstract

A novel technique is proposed for the direct and simultaneous estimation of multiple phase derivatives from a deformation modulated carrier fringe pattern in a multi-wave holographic interferometry set-up. The fringe intensity is represented as a spatially-varying autoregressive (SVAR) model. The spatially-varying coefficients of the SVAR model are derived using a forward–backward approach of linear estimation of the fringe intensity. Using these coefficients, the poles of the SVAR model transfer function are computed and the angles of these poles provide the estimation of phase derivatives. The estimation of carrier frequency is performed by the proposed method using a reference interferogram. Simulation results are provided in the presence of noise and fringe amplitude modulation.