Title
Measurement of non-linear distortions in the vibration of acoustic transducers and acoustically driven membranesMeasurement of non-linear distortions in the vibration of acoustic transducers and acoustically driven membranes
Author
Faculty/Department
Faculty of Sciences. Physics
Research group
Biophysics and Biomedical Physics
Publication type
article
Publication
Barking,
Subject
Physics
Source (journal)
Optics and lasers in engineering. - Barking
Volume/pages
47(2009):3/4, p. 419-430
ISSN
0143-8166
ISI
000264096500019
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Different methods exist to quantify non-linearity, and recently a new method was proposed that uses multisines to determine output response level, noise level, and level of non-linear distortions simultaneously from one single short experiment. We used heterodyne vibrometry to measure the vibration of a membrane while it is stimulated acoustically, and to determine the non-linear distortions in its response with this new method of analysis. We demonstrate the method on an electrically driven earphone. Analysis of the sound output and optically measured vibration deliver comparable results, and clearly detect non-linear distortions. Next, we apply the method on an acoustically driven elastic membrane. At vibration amplitudes of the same magnitude as on the earphone, non-linear distortions are much smaller, as to be expected on an elastic membrane, but they can still be detected with the vibrometer. This technique can be used to investigate the non-linearity of acoustically driven systems such as the middle ear.
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