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    Dual-wavelength image-plane digital holography for dynamic measurement


    Fu, Yu and Pedrini, Giancarlo and Hennelly, Bryan M. and Groves, Roger M. and Osten, Wolfgang (2009) Dual-wavelength image-plane digital holography for dynamic measurement. Optics and Lasers in Engineering, 47. pp. 552-557. ISSN 0143-8166

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    Abstract

    A dual-wavelength image-plane digital holography, combined with a windowed Fourier analysis, is presented for dynamic measurement of a vibrating object. In order to expand the range of the velocity measurement, the object is simultaneously illuminated by two lasers with different wavelengths. A sequence of digital holograms of a vibrating object is captured by a CCD camera and two wrapped phase maps are retrieved from each digital hologram. At each instant, a new phase distribution with a synthetic wavelength is obtained by subtracting these two wrapped phase maps. A windowed Fourier analysis is then applied spatially and temporally to retrieve the high-precision displacement and velocity of the tested object. Experimental results show the requirement on the camera capture frequency is reduced by the proposed method.

    Item Type: Article
    Additional Information: The definitive version of this article is available at doi:10.1016/j.optlaseng.2008.10.002 ©2008 Elsevier Ltd. All rights reserved. Y. Fu gratefully acknowledges the financial support of the Alexander von Humboldt Foundation. This work is also supported by the German Science Foundation, DFG, Grant no. OS. 111/22-1, the MULTI-ENCODE project (006427 (SSPI)) funded by the European Union, and the National Science Foundation of China (NSFC) under Contract no. 10772171
    Keywords: Digital holography; Two-wavelength; Windowed Fourier analysis; Vibration measurement; Phase retrieval;
    Academic Unit: Faculty of Science and Engineering > Computer Science
    Faculty of Science and Engineering > Electronic Engineering
    Item ID: 5769
    Identification Number: https://doi.org/10.1016/j.optlaseng.2008.10.002
    Depositing User: Dr. Bryan Hennelly
    Date Deposited: 04 Feb 2015 15:59
    Journal or Publication Title: Optics and Lasers in Engineering
    Publisher: Elsevier
    Refereed: Yes
    URI:

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