Simulation and experimental study of flexible electret-based loudspeaker vibration modes by electronic speckle pattern interferometry

Yu-Chi Chen; Te-Hsun Chen; Chih-Jen Chien; Wen-Chi Chang; Chih-Chiang Cheng; Wen-Ching Ko; Kuang-Chong Wu; Chih-Kung Lee

doi:10.1117/12.859245

2 August 2010 Simulation and experimental study of flexible electret-based loudspeaker vibration modes by electronic speckle pattern interferometry

Yu-Chi Chen, Te-Hsun Chen, Chih-Jen Chien, Wen-Chi Chang, Chih-Chiang Cheng, Wen-Ching Ko, Kuang-Chong Wu, Chih-Kung Lee

Author Affiliations +

Proceedings Volume 7791, Interferometry XV: Applications; 779109 (2010) https://doi.org/10.1117/12.859245
Event: SPIE Optical Engineering + Applications, 2010, San Diego, California, United States

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.

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Yu-Chi Chen, Te-Hsun Chen, Chih-Jen Chien, Wen-Chi Chang, Chih-Chiang Cheng, Wen-Ching Ko, Kuang-Chong Wu, and Chih-Kung Lee "Simulation and experimental study of flexible electret-based loudspeaker vibration modes by electronic speckle pattern interferometry", Proc. SPIE 7791, Interferometry XV: Applications, 779109 (2 August 2010); https://doi.org/10.1117/12.859245

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