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Spatially encoded multibeam laser Doppler vibrometry using a single photodetector

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Spatially encoded multibeam laser Doppler vibrometry using a single photodetector

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Title: Spatially encoded multibeam laser Doppler vibrometry using a single photodetector
Author: Fu, Yu; Guo, Min; Phua, Poh Boon
Copyright year: 2010
Abstract: A laser Doppler vibrometer with single photodetector is introduced to measure the vibration on multiple points of target simultaneously. A 2 5 beam array with various frequency shifts is generated by three acousto-optic devices, illuminating different points on a vibrating object. The reflected beams interfere with a reference beam on a high-speed photodetector, and the signal is amplified and digitized with a rate of 500 megasamples/s. To extract vibration information of different points, the carrier frequencies of each beam are elaborately designed so that they can be separated from cross-talk regions in the spectrum. The experimental results are compared with that from a commercial single-point vibrometer, and the comparison shows that it is possible to do a precise measurement on multiple points simultaneously using a single photodetector.
Subject: DRNTU::Science::Physics::Optics and light
Type: Journal Article
Series/ Journal Title: Optics letters
Research Centre: Temasek Laboratories
Rights: This paper was published in [Optics Letters] 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=ol-35-9-1356]. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Version: Published version

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