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Title: Continuous scanning laser vibrometry for measurements on rotating structures
Authors: Halkon, Ben J.
Rothberg, Steve
Keywords: Laser Doppler vibrometry
Velocity sensitivity
Vibration measurement
Rotating machinery
Issue Date: 2003
Publisher: © Trans Tech Publications
Citation: HALKON, B.J. and ROTHBERG, S., 2003. Continuous scanning laser vibrometry for measurements on rotating structures. IN: Cartmell, M.P. (ed.). Modern Practice in Stress and Vibration Analysis: Proceedings of the 5th International Conference on Modern Practice in Stress and Vibration Analysis, Glasgow, Scotland, 9-11 September 2003. Uetikon-Zuerich, Switzerland : Trans Tech Publications, pp. 245-252.
Series/Report no.: Materials Science Forum;440-441
Abstract: It is readily accepted that a Laser Vibrometer measures target velocity in the direction of the incident laser beam but it is essential that, for correct measurement interpretation, the target velocity be considered in terms of the various target motion components. This paper begins with a review of the theoretical description of the velocity sensed by a dual mirror scanning Laser Vibrometer incident in an arbitrary direction on a rotating target of flexible cross-section undergoing arbitrary vibration. This comprehensive velocity sensitivity model can be applied to any Laser Vibrometer measurement configuration on any target and is sufficiently versatile to incorporate time dependent beam orientation. This is described in this paper with particular reference to continuous circular scanning Laser Doppler Vibrometry. The velocity sensitivity model allows a detailed analysis of the form of the measurement that is obtained in actual scan configurations. For example, additional components occur in a circular scanning Laser Vibrometer measurement on a rotating target that can be shown to be due to a combination of instrument configuration and target misalignment. In this paper, the measured data obtained from a circular scanning measurement on a rotating target undergoing axial vibration is investigated as a means of demonstrating the usefulness of the comprehensive velocity sensitivity model.
Description: This is a conference paper. It was published in the series Materials Science Forum and the definitive version is available at: http://www.scientific.net/MSF.440-441
Version: Accepted for publication
DOI: 10.4028/www.scientific.net/MSF.440-441.245
URI: https://dspace.lboro.ac.uk/2134/5606
ISBN: 0878499288
ISSN: 1662-9752
Appears in Collections:Conference Papers and Contributions (Mechanical, Electrical and Manufacturing Engineering)

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