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Title: Laser vibrometry: pseudo-vibrations
Authors: Rothberg, Steve
Baker, J.R.
Halliwell, Neil A.
Issue Date: 1989
Publisher: © Elsevier
Citation: ROTHBERG, S.J., BAKER, J.R. and HALLIWELL, N.A., 1989. Laser vibrometry: pseudo-vibrations. Journal of Sound and Vibration, 135 (3), pp. 516 - 522.
Abstract: The application of Laser Doppler Velocimetry (LDV) to the measurement of normal-to-surface vibration of a solid surface is now established as a technique complementary to the use of an accelerometer. Several practical systems have been developed and a number are now commercially available. Each velocirneter relies on the same principle of operation, namely the detection of a Doppler shift, fD, in the light scattered from a vibrating target. Fig. 1 shows a typical vibrometer arrangement. Since the photodetector cannot respond quickly enough to detect the light frequency directly, scattered light from the vibrating surface is mixed with a reference beam and heterodyned on the detector surface. In addition, in order to resolve the sign of the vibration velocity, it is necessary to pre-shift the reference beam by a known amount, fR, resulting in an optical beat at the detector of frequency (fR ± fD). An appropriate Doppler signal processor then demodulates the detector signal to produce a time-resolved analogue of the target vibration velocity (in the direction of the incident beam). Systems differ in the method adopted to produce the reference beam frequency shift. Bragg cells [1], diffraction gratings [2] rotating scattering discs [3] and frequency modulation of the laser beam itself [4] have all been used successfully... (continues).
Description: This article was published in the Journal of Sound and Vibration [© Elsevier] and the definitive version is available at: http://dx.doi.org/10.1016/0022-460X(89)90705-0
Version: Accepted for publication
DOI: 10.1016/0022-460X(89)90705-0
URI: https://dspace.lboro.ac.uk/2134/9647
Publisher Link: http://dx.doi.org/10.1016/0022-460X(89)90705-0
ISSN: 0022-460X
Appears in Collections:Published Articles (Mechanical and Manufacturing Engineering)

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