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

Wen Chen, Chenggen Quan, Cho Jui Tay

Research output: Journal article publicationConference articleAcademic researchpeer-review

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.
Original languageEnglish
Article number73754S
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume7375
DOIs
Publication statusPublished - 1 Dec 2009
Externally publishedYes
EventInternational Conference on Experimental Mechanics 2008, ICEM 2008 - Nanjing, China
Duration: 8 Nov 20088 Nov 2008

Keywords

  • Digital holographic interferometry (DHI)
  • Profiling
  • Short time fourier transform (STFT)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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