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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 16 — Jun. 1, 2007
  • pp: 3126–3132

Multipoint laser vibrometer for modal analysis

William N. MacPherson, Mark Reeves, David P. Towers, Andrew J. Moore, Julian D. C. Jones, Martin Dale, and Craig Edwards  »View Author Affiliations

Applied Optics, Vol. 46, Issue 16, pp. 3126-3132 (2007)

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Experimental modal analysis of multifrequency vibration requires a measurement system with appropriate temporal and spatial resolution to recover the mode shapes. To fully understand the vibration it is necessary to be able to measure not only the vibration amplitude but also the vibration phase. We describe a multipoint laser vibrometer that is capable of high spatial and temporal resolution with simultaneous measurement of 256 points along a line at up to 80 kHz . The multipoint vibrometer is demonstrated by recovering modal vibration data from a simple test object subject to transient excitation. A practical application is presented in which the vibrometer is used to measure vibration on a squealing rotating disk brake.

© 2007 Optical Society of America

OCIS Codes
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(120.6160) Instrumentation, measurement, and metrology : Speckle interferometry
(120.7280) Instrumentation, measurement, and metrology : Vibration analysis

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: September 8, 2006
Revised Manuscript: January 23, 2007
Manuscript Accepted: January 27, 2007
Published: May 15, 2007

William N. MacPherson, Mark Reeves, David P. Towers, Andrew J. Moore, Julian D. C. Jones, Martin Dale, and Craig Edwards, "Multipoint laser vibrometer for modal analysis," Appl. Opt. 46, 3126-3132 (2007)

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