Profiling of an object using a time-frequency analysis method in digital holographic interferometry

Wen Chen; Chenggen Quan; Cho Jui Tay

doi:10.1117/12.839318

25 August 2009 Profiling of an object using a time-frequency analysis method in digital holographic interferometry

Wen Chen, Chenggen Quan, Cho Jui Tay

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73754S (2009) https://doi.org/10.1117/12.839318
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

In recent years, temporal analysis methods have become popular in the processing of fringe patterns. In the conventional temporal phase unwrapping method, each pixel is processed independently of other pixels. Thus good data can be effectively preserved. However, the errors may still accumulate along the time axis for the bad data. In this paper, a timefrequency analysis method i.e., short time Fourier transform (STFT) algorithm, is employed to process wrapped phase maps in digital holographic interferometry (DHI). In the proposed STFT method, phase unwrapping operations are effectively avoided in both spatial and temporal domains and the errors along the time axis can be more effectively suppressed. In addition, the continuous phase distributions obtained can characterize the shape of a test object. An experiment is conducted to show the validity of STFT algorithm in DHI.

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Wen Chen, Chenggen Quan, and Cho Jui Tay "Profiling of an object using a time-frequency analysis method in digital holographic interferometry", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73754S (25 August 2009); https://doi.org/10.1117/12.839318

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KEYWORDS

Digital holography

Holograms

Digital filtering

Fourier transforms

Holographic interferometry

Beam splitters

Optical fibers

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