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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 23 — Aug. 10, 2007
  • pp: 5719–5727

Vibration measurement by temporal Fourier analyses of a digital hologram sequence

Yu Fu, Giancarlo Pedrini, and Wolfgang Osten  »View Author Affiliations


Applied Optics, Vol. 46, Issue 23, pp. 5719-5727 (2007)
http://dx.doi.org/10.1364/AO.46.005719


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Abstract

A method for whole-field noncontact measurement of displacement, velocity, and acceleration of a vibrating object based on image-plane digital holography is presented. A series of digital holograms of a vibrating object are captured by use of a high-speed CCD camera. The result of the reconstruction is a three-dimensional complex-valued matrix with noise. We apply Fourier analysis and windowed Fourier analysis in both the spatial and the temporal domains to extract the displacement, the velocity, and the acceleration. The instantaneous displacement is obtained by temporal unwrapping of the filtered phase map, whereas the velocity and acceleration are evaluated by Fourier analysis and by windowed Fourier analysis along the time axis. The combination of digital holography and temporal Fourier analyses allows for evaluation of the vibration, without a phase ambiguity problem, and smooth spatial distribution of instantaneous displacement, velocity, and acceleration of each instant are obtained. The comparison of Fourier analysis and windowed Fourier analysis in velocity and acceleration measurements is also presented.

© 2007 Optical Society of America

OCIS Codes
(070.6020) Fourier optics and signal processing : Continuous optical signal processing
(090.2880) Holography : Holographic interferometry
(100.7410) Image processing : Wavelets
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.7280) Instrumentation, measurement, and metrology : Vibration analysis

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: April 17, 2007
Manuscript Accepted: May 22, 2007
Published: August 8, 2007

Citation
Yu Fu, Giancarlo Pedrini, and Wolfgang Osten, "Vibration measurement by temporal Fourier analyses of a digital hologram sequence," Appl. Opt. 46, 5719-5727 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-23-5719

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