Laser Doppler vibrometry and near-field acoustic holography: different approaches for surface velocity distribution measurement

Milena Martarelli; Gian Marco Revel; Enrico Primo Tomasini

doi:10.1117/12.468187

22 May 2002 Laser Doppler vibrometry and near-field acoustic holography: different approaches for surface velocity distribution measurement

Milena Martarelli, Gian Marco Revel, Enrico Primo Tomasini

Author Affiliations +

Proceedings Volume 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (2002) https://doi.org/10.1117/12.468187
Event: Fifth International Conference on Vibration Measurements by Laser Techniques, 2002, Ancona, Italy

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.

Citation Download Citation

Milena Martarelli, Gian Marco Revel, and Enrico Primo Tomasini "Laser Doppler vibrometry and near-field acoustic holography: different approaches for surface velocity distribution measurement", Proc. SPIE 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2002); https://doi.org/10.1117/12.468187

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available