Vibration Measurements on Rotating Machinery Using Laser Doppler Velocimetry

[+] Author and Article Information
S. J. Rothberg, N. A. Halliwell

Department of Mechanical Engineering, Loughborough University of Technology, Loughborough, Leicestershire, LE11 3TU, UK

J. Vib. Acoust 116(3), 326-331 (Jul 01, 1994) (6 pages) doi:10.1115/1.2930432 History: Received October 01, 1992; Revised April 01, 1993; Online June 17, 2008


This paper explores the use of laser vibrometry for vibration measurement directly from a rotating component. The presence of a surface velocity component due to the rotation itself is shown to create a strong measurement dependency on vibration perpendicular to the intended measurement direction. Particular ambiguity results at synchronous frequencies. A mathematical means to resolve the genuine vibration components from two simultaneous laser vibrometer measurements is presented and shown to be effective in the study of nonsynchronous rotor vibrations.

Copyright © 1994 by The American Society of Mechanical Engineers
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