Characterization of acoustic materials using the scanning laser Doppler vibrometer

Steve Vanlanduit, Joris Vanherzeele, C Vuye, Patrick Guillaume

Research output: Chapter in Book/Report/Conference proceedingConference paperResearch

1 Citation (Scopus)

Abstract

In this article we will present a method to estimate sound absorption
coefficients from measurements of the incident and reflected sound
fields near the material under test. The sound fields are visualized
using a scanning laser Doppler vibrometer (SLDV). By aiming the SLDV at
a rigid (non-vibrating) object and letting the beam pass through a
sound field the spatial pressure distribution can be made visible. By
visualizing both incident and reflected sound field with respect to a
material sample in this manner, the acoustic absorption coefficients
can be determined (this is the ratio of the absorbed energy and
incident energy). Two alternative set-ups are proposed in this article:
a one-dimensional set-up where the sound field (i.e. the standing
waves) inside a thin glass tube is measured, and a two-dimensional
set-up where the propagating and reflecting sound field between two
parallel glass plates is visualized. While the former can only be used
to obtain normal incidence absorption coefficients the latter can also
be used to estimate oblique incidence absorption values. It is shown
that the method is accurate at high frequencies where traditional
standardized acoustic material characterization techniques mostly fail.
Original languageEnglish
Title of host publicationSeventh International Conference on Theoretical and Applied Mechanics
Publication statusPublished - 30 May 2006
EventFinds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet - Stockholm, Sweden
Duration: 21 Sep 200925 Sep 2009

Conference

ConferenceFinds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet
CountrySweden
CityStockholm
Period21/09/0925/09/09

Keywords

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