Publication
Title
Measurement of non-linear distortions in the vibration of acoustic transducers and acoustically driven membranes
Author
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.
Language
English
Source (journal)
Optics and lasers in engineering. - Barking
Publication
Barking : 2009
ISSN
0143-8166
Volume/pages
47:3/4(2009), p. 419-430
ISI
000264096500019
Full text (Publisher's DOI)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 12.05.2009
Last edited 02.08.2017
To cite this reference