Dual-wavelength image-plane digital holography for dynamic measurement

被引:53
|
作者
Fu, Yu [1 ,2 ]
Pedrini, Giancarlo [2 ]
Hennelly, Bryan M. [3 ]
Groves, Roger M. [2 ]
Osten, Wolfgang [2 ]
机构
[1] Natl Univ Singapore, Dept Mech Engn, Singapore 119260, Singapore
[2] Univ Stuttgart, Inst Tech Opt, D-70569 Stuttgart, Germany
[3] Natl Univ Ireland, Dept Comp Sci, Maynooth, Kildare, Ireland
基金
美国国家科学基金会;
关键词
Digital holography; Two-wavelength; Windowed Fourier analysis; Vibration measurement; Phase retrieval; SPECKLE-PATTERN INTERFEROMETRY; LASER-DIODE INTERFEROMETER; FOURIER-TRANSFORM METHOD; PHASE-SHIFTING INTERFEROMETRY; VIBRATION MEASUREMENT; 2-WAVELENGTH INTERFEROMETRY; DEFORMATION; SEQUENCE;
D O I
10.1016/j.optlaseng.2008.10.002
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
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. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:552 / 557
页数:6
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