Abstract

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 $80\mathrm{kHz}$. 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

Multi-point vibrometer based on high-speed digital in-line holography

Julien Poittevin, Pascal Picart, Charly Faure, François Gautier, and Charles Pézerat
Appl. Opt. 54(11) 3185-3196 (2015)

Multipoint laser Doppler vibrometry with single detector: principles, implementations, and signal analyses

Y. Fu, M. Guo, and P. B. Phua
Appl. Opt. 50(10) 1280-1288 (2011)

High-speed phase-stepped digital speckle pattern interferometry using a complementary metal-oxide semiconductor camera

Tao Wu, Julian D. C. Jones, and Andrew J. Moore
Appl. Opt. 45(23) 5845-5855 (2006)

Measurement of complex surface deformation by high-speed dynamic phase-stepped digital speckle pattern interferometry

James M. Kilpatrick, Andrew J. Moore, James S. Barton, Julian D. C. Jones, Mark Reeves, and Clive Buckberry
Opt. Lett. 25(15) 1068-1070 (2000)

Laser vibrometer based on optical-feedback-induced frequency modulation of a single-mode laser diode

P. A. Roos, M. Stephens, and C. E. Wieman
Appl. Opt. 35(34) 6754-6761 (1996)