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Title: Synchronized-scanning laser vibrometry
Authors: Halkon, Ben J.
Rothberg, Steve
Keywords: Laser Doppler vibrometry
Vibration measurement
Rotating machinery
Operational deflection shapes
Mode shapes
Issue Date: 2004
Publisher: © 2004 Society of Photo-Optical Instrumentation Engineers.
Citation: HALKON, B.J. and ROTHBERG, S.J., 2004. Synchronized-scanning laser vibrometry. IN: Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Series/Report no.: Proceedings of the SPIE;5503 (260)
Abstract: The use ofLaser Vibrometers incorporating some form ofmanipulation ofthe laser beam orientation, typically using two orthogonally aligned mirrors, has become increasingly popular in recent years with considerable attention being given to the operation of such scanning Laser Vibrometers in continuous scanning mode. Here the laser beam orientation is a continuous function oftime. making it possible, for example, to track a single point on a moving target such as a rotating bladed disc. A recently derived comprehensive velocity sensitivity model has been developed to incorporate timedependent beam orientation enabling confident and detailed analysis ofdata obtained in such measurements. The model predicts the measured velocity for arbitrary mirror scan angles and arbitrary target motion and is shown to be especially valuable in revealing the sources ofadditional components that occur in continuous scanning and tracking measurements on rotors. The development of the comprehensive velocity sensitivity model and of sophisticated measurement hardware and software has resulted in proposal of the exciting new Synchronised-Scanning Laser Vibrometry technique. Introduced for the first time in this paper, the measurement involves the probe laser beam tracking the rotating structure and simultaneously scanning the region of interest to provide modal data under operating conditions, i.e. during rotation. Such a measurement is inconceivable by any other means and the system that has been created has the potential to provide data offundamental importance in the design and development ofa wide range ofdevices from hard disk drives to gas turbines.
Description: This is a conference paper [© Society of Photo-Optical Instrumentation Engineers]. It is also available at: http://dx.doi.org/10.1117/12.579759 .One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Version: Published
DOI: 10.1117/12.579759
URI: https://dspace.lboro.ac.uk/2134/5841
ISSN: 0277-786X
Appears in Collections:Conference Papers and Presentations (Mechanical, Electrical and Manufacturing Engineering)

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