Multiple phase estimation via signal separation using a windowed Fourier transform in digital holographic interferometry

• Published in: Measurement science & technology Vol. 26; no. 7; pp. 75204 - 7
• Main Authors: Kulkarni, Rishikesh, Rastogi, Pramod
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.07.2015
• Subjects: amplitude discrimination; Digital; digital holographic interferometry; Filtering; Filtration; Fourier transforms; Holographic interferometry; in-plane displacement; Interference; Mathematical models; multiple phase estimation; out-of-plane displacement; Separation; signal separation; windowed Fourier transform
• ISSN: 0957-0233; 1361-6501; 1361-6501
• DOI: 10.1088/0957-0233/26/7/075204

This paper proposes a novel method for the simultaneous estimation of multiple interference phases from a single recording of the interference field in a multi-wave digital holographic interferometry set-up. The method involves the separation of signal components from the recorded interference field based on windowed Fourier transform based filtering and amplitude discrimination criteria. The proposed method possesses the advantages offered by windowed Fourier transform based filtering such as noise robustness and a high quality reconstruction of the signal components. The performance of the method is validated with numerical and experimental examples.