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Shock and Vibration
Volume 3 (1996), Issue 2, Pages 141-152

Measurement of Translational and Angular Vibration Using a Scanning Laser Doppler Vibrometer

A.B. Stanbridge and D.J. Ewins

Imperial College of Science, Technology and Medicine, Department of Mechanical Engineering, London SW7 2BX, UK

Received 11 November 1994; Accepted 21 August 1995

Copyright © 1996 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


An experimental procedure for obtaining angular and translational vibration in one measurement, using a continuously scanning laser Doppler vibrometer, is described. Sinusoidal scanning, in a straight line, enables one angular vibration component to be measured, but by circular scanning, two principal angular vibrations and their directions can be derived directly from the frequency response sidebands. Examples of measurements on a rigid cube are given. Processes of narrow-band random excitation and modal analysis are illustrated with reference to measurements on a freely suspended beam. Sideband frequency response references are obtained by using multiplied excitation force and mirror-drive signals.