title: Estimation of phase derivatives using discrete chirp-Fourier-transform-based method.
abstract: Estimation of phase derivatives is an important task in many interferometric measurements in optical metrology. This Letter introduces a method based on discrete chirp-Fourier transform for accurate and direct estimation of phase derivatives, even in the presence of noise. The method is introduced in the context of the analysis of reconstructed interference fields in digital holographic interferometry. We present simulation and experimental results demonstrating the utility of the proposed method.
authors.affiliation: Applied Computing and Mechanics Laboratory, Ecole Polytechnique Fédérale de Lausanne,1015 Lausanne, Switzerland.
authors.forename: Sai Siva
authors.initials: SS
authors.lastname: Gorthi
authors.forename: Pramod
authors.initials: P
authors.lastname: Rastogi