Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/91916
Title: Vibration measurement by temporal Fourier analyses of a digital hologram sequence
Authors: Fu, Yu
Pedrini, Giancarlo
Osten, Wolfgang
Keywords: DRNTU::Science::Physics::Optics and light
Issue Date: 2007
Source: Fu, Y., Pedrini, G., & Osten, W. (2007). Vibration measurement by temporal Fourier analyses of a digital hologram sequence. Applied Optics, 46(23), 5719-5727.
Series/Report no.: Applied Optics
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.
URI: https://hdl.handle.net/10356/91916
http://hdl.handle.net/10220/6475
ISSN: 0003-6935
DOI: http://dx.doi.org/10.1364/AO.46.005719
Rights: This paper was published in [Applied Optics] and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: [http://www.opticsinfobase.org/abstract.cfm?URI=ao-46-23-5719]. Systematic or multiple reproduction or distribution to multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:TL Journal Articles

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