Two-Channel Laser Vibrometer Techniques for Vibrational Intensity Measurements: Part 1—Flexural Intensity

[+] Author and Article Information
T. E. McDevitt, C. B. Burroughs

Applied Research Laboratory, The Pennsylvania State University, P.O. Box 30, State College, PA 16804

G. H. Koopmann

Department of Mechanical Engineering, The Pennsylvania State University, 157A Hammond Building, University Park, PA 16802

J. Vib. Acoust 115(4), 436-440 (Oct 01, 1993) (5 pages) doi:10.1115/1.2930369 History: Received July 01, 1991; Revised August 01, 1992; Online June 17, 2008


A laser technique which measures vibrational energy flow (intensity) via propagating bending waves is described. A pair of scanning laser beams from a two-channel laser vibrometer is used to provide a nonintrusive measurement of the intensity at various points on a vibrating beam. Results are shown to compare well with those of two additional techniques. These techniques, used for validation, employ a single laser beam and can only be used at resonance frequencies in beams or rods. The two-channel laser technique described can be applied to two-dimensional intensity measurements, is not limited to single frequency excitation, and has an inherent capability to facilitate phase error elimination via a photodetector switching technique which is also described.

Copyright © 1993 by The American Society of Mechanical Engineers
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