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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 35, Iss. 9 — May. 1, 2010
  • pp: 1356–1358

Spatially encoded multibeam laser Doppler vibrometry using a single photodetector

Y. Fu, M. Guo, and P. B. Phua  »View Author Affiliations

Optics Letters, Vol. 35, Issue 9, pp. 1356-1358 (2010)

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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.

© 2010 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(120.7280) Instrumentation, measurement, and metrology : Vibration analysis

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: February 4, 2010
Revised Manuscript: March 15, 2010
Manuscript Accepted: March 18, 2010
Published: April 23, 2010

Y. Fu, M. Guo, and P. B. Phua, "Spatially encoded multibeam laser Doppler vibrometry using a single photodetector," Opt. Lett. 35, 1356-1358 (2010)

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