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Proceedings Paper

Simulation and experimental study of flexible electret-based loudspeaker vibration modes by electronic speckle pattern interferometry
Author(s): Yu-Chi Chen; Te-Hsun Chen; Chih-Jen Chien; Wen-Chi Chang; Chih-Chiang Cheng; Wen-Ching Ko; Kuang-Chong Wu; Chih-Kung Lee
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Paper Abstract

Electret-based electrostatic devices have been used in the electro-acoustic field for decades. Recently, the improvement of its charge retention has been of interest for application to the field of smart materials. Hence, the flexible electret-based loudspeaker has become an important research topic for futuristic applications such as 3C (computers, communications and consumer electronics) and smart curtains. The volume velocity and the on-axis sound pressure level (SPL) of an electret loudspeaker are the key parameters of interest. To study the vibration characteristics of an electret diaphragm, a finite element analysis (FEA) was introduced to facilitate the design. To validate the finite element analysis (FEA) model, an out-of plane full-field non-destructive optical detection method which incorporates electronic speckle pattern interferometry (ESPI), was applied to determine the vibration mode shape of thin film. By driving the electret loudspeaker at different frequencies, a corresponding vibration mode of interest was detected with the ESPI set-up. Both the simulations and the experimental results obtained on the measurement platform are detailed in this paper.

Paper Details

Date Published: 2 August 2010
PDF: 10 pages
Proc. SPIE 7791, Interferometry XV: Applications, 779109 (2 August 2010); doi: 10.1117/12.859245
Show Author Affiliations
Yu-Chi Chen, National Taiwan Univ. (Taiwan)
Te-Hsun Chen, National Taiwan Univ. (Taiwan)
Chih-Jen Chien, National Taiwan Univ. (Taiwan)
Wen-Chi Chang, National Taiwan Univ. (Taiwan)
Chih-Chiang Cheng, National Taiwan Univ. (Taiwan)
Wen-Ching Ko, National Taiwan Univ. (Taiwan)
Kuang-Chong Wu, National Taiwan Univ. (Taiwan)
National Applied Research Labs. (Taiwan)
Chih-Kung Lee, National Taiwan Univ. (Taiwan)
Industrial Technology Research Institute (Taiwan)

Published in SPIE Proceedings Vol. 7791:
Interferometry XV: Applications
Cosme Furlong; Christophe Gorecki; Erik L. Novak, Editor(s)

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