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Title: Dual-wavelength image-plane digital holography for dynamic measurement
Authors: Fu, Y. 
Pedrini, G.
Hennelly, B.M.
Groves, R.M.
Osten, W.
Keywords: Digital holography
Phase retrieval
Vibration measurement
Windowed Fourier analysis
Issue Date: May-2009
Citation: Fu, Y., Pedrini, G., Hennelly, B.M., Groves, R.M., Osten, W. (2009-05). Dual-wavelength image-plane digital holography for dynamic measurement. Optics and Lasers in Engineering 47 (5) : 552-557. ScholarBank@NUS Repository.
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. © 2008 Elsevier Ltd. All rights reserved.
Source Title: Optics and Lasers in Engineering
ISSN: 01438166
DOI: 10.1016/j.optlaseng.2008.10.002
Appears in Collections:Staff Publications

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