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Proceedings Paper

Laser Doppler vibrometry and near-field acoustic holography: different approaches for surface velocity distribution measurement
Author(s): Milena Martarelli; Gian Marco Revel; Enrico Primo Tomasini
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Paper Abstract

Nowadays there are several direct or indirect measurement methods for the determination of the surface velocity in vibrating structures, but two of them seem to be the most promising and interesting, in particular for vibro-acoustic problems: Laser Doppler Vibrometry (LDV) and Near-field Acoustic Holography (NAH). While LDV is a direct laserbased vibration measurement technique, NAH allows the determination of the particle surface velocity starting from simultaneous microphone measurements performed on a plane array positioned near the vibrating object, although with some limitations. In this work a comparison between the two techniques is performed on a simple laboratory case, in order to carefully and quantitatively asses the measurement uncertainty in the indirect NAH method used to estimate the vibration velocity. Also advantages and disadvantages of the two methods are briefly discussed. This study was conducted within the European Growth Project "ACES" (Optimal Acoustic Equivalent Source Descriptors for Automotive Noise Problems) GRD1-1999-11202.

Paper Details

Date Published: 22 May 2002
PDF: 13 pages
Proc. SPIE 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2002); doi: 10.1117/12.468187
Show Author Affiliations
Milena Martarelli, Univ. degli Studi di Ancona (Italy)
Gian Marco Revel, Univ. degli Studi di Ancona (Italy)
Enrico Primo Tomasini, Univ. degli Studi di Ancona (Italy)

Published in SPIE Proceedings Vol. 4827:
Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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