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Title: Pseudo-vibration sensitivities for commercial laser vibrometers
Authors: Martin, Peter
Rothberg, Steve
Keywords: Laser vibrometry
Speckle
Pseudo-vibration
Transverse sensitivity
Tilt
Rotation
Issue Date: 2011
Publisher: © Elsevier Ltd.
Citation: MARTIN, P. and ROTHBERG, S., 2011. Pseudo-vibration sensitivities for commercial laser vibrometers. Mechanical Systems and Signal Processing, 25 (7), pp. 2753-2765.
Abstract: Pseudo-vibration sensitivities in laser vibrometry are the consequence of measurement noise generated by surface motions other than that on-axis with the incident laser beam(s), such as transverse and tilt vibrations or rotation. Concentrating solely on commercial laser vibrometers to maximise value to the vibrometer user, this paper quantifies pseudo-vibration sensitivities for five single beam instruments (for translational vibration measurement) and two parallel beam instruments (for angular vibration measurement) across a range of surface treatments and roughnesses. Transverse, tilt and rotation sensitivities are quantified for the single beam instruments. In-plane rotation, rotation and tilt sensitivities are quantified for the parallel beam instruments. Estimates of sensitivities for parallel beam instruments based on related quantifications for single beam instruments are shown to offer order-of-magnitude agreement. Further confirmation is provided of the benefits of smaller laser beams for measurements on tilting or rotating surfaces and of larger beams for measurements on surfaces with transverse motion. For rotor vibration applications, lower sensitivities are found for a focus location on the shaft rotation axis rather than its surface. Based on experimental evidence, refinements to the test methods are suggested with a view towards the formation of a Standard. These comprise placing limits on surface flatness and rotor out-of-roundness, inclusion of agreed ranges for target displacement amplitude and rotor diameter, and acknowledgement of the importance of focus location for rotation sensitivities.
Description: This article was published in the journal, Mechanical Systems and Signal Processing [© Elsevier Ltd.] and the definitive version is available at: http://dx.doi.org/doi:10.1016/j.ymssp.2011.02.009
Version: Accepted for publication
DOI: 10.1016/j.ymssp.2011.02.009
URI: https://dspace.lboro.ac.uk/2134/8843
Publisher Link: http://dx.doi.org/10.1016/j.ymssp.2011.02.009
ISSN: 0888-3270
1096-1216
Appears in Collections:Published Articles (Mechanical and Manufacturing Engineering)

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