Retrieval of instantaneous frequency from digital holograms based on adaptive windows

Wen Chen, Chenggen Quan, Cho Jui Tay

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)

Abstract

In recent years, time-frequency analysis methods have been significantly developed for the processing of fringe patterns. Among such methods, the short-time Fourier transform (STFT) has been proven a valid method to process noisy fringe patterns. In this paper, the complex phasor and the STFT are used to retrieve instantaneous frequency from a series of holograms based on adaptive windows. Continuous phase maps are calculated by integration of the extracted instantaneous frequency, and phase unwrapping is effectively avoided in both temporal and spatial domains. The validity of this method is verified by an experiment. In addition, a comparison between conventional temporal phase unwrapping and the STFT is presented.
Original languageEnglish
Article number065801
JournalOptical Engineering
Volume47
Issue number6
DOIs
Publication statusPublished - 1 Dec 2008
Externally publishedYes

Keywords

  • complex phasor
  • continuous deformation
  • digital holography
  • instantaneous frequency
  • short-time Fourier transform

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)

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