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Optical Microphone Incorporating a Dual-Core Multimode Fiber Block and a Reflective Micromirror  

Song, Ju-Han (광운대학교 전자공학과)
Lee, Sang-Shin (광운대학교 전자공학과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers C / v.55, no.5, 2006 , pp. 263-266 More about this Journal
Abstract
An optical microphone was developed using a dual-core multi-mode fiber block and a membrane type micromirror. The fiber block serves as a compact optical head, and the micromirror as a reflective diaphragm. The micromirror is designed to be suspended through a silicon bar connected t a frame, allowing for displacement induced by acoustic waves. The optical head is implemented by integrating two multi-mode fibers in a single block, and used to transfer light signals between it and the diaphragm. For the assembled microphone, its static characteristics were observed to reveal the operating point defined as the optimum distance between the optical head and the diaphragm. And its dynamic response was tested to exhibit a frequency bandwidth of 3 kHz with the variation of $\sim5dB$.
Keywords
Micromirror; Diaphragm; Fiber; Transducer; Microphone; Acousto-Optic Sensor;
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1 B. E. A. Saleh and M.C. Teich, Fundamentals of Photonics. New York: Wiley, 1991, pp. 80-107
2 I. Cho, K. Yun, H. Lee, J. Yoon, and E. Yoon, 'A low voltage three axis electromagnetically actuated micromirror with bulk silicon mirror plates and torsion bars,' IEEE Int'l Conf. MEMS 2002, Las Vegas, USA, Jan. 2002
3 N. Furstenau, H. Horack, and W. Schmidt, 'Extrinsic Fabry Perot interferometer fiber optic microphone,' IEEE Trans. Instrumentation and Measurement, vol. 47, no. 1, pp. 138 142, 1998   DOI   ScienceOn
4 H. Sagberg, A. Sudbo, O. Solgaard, K. Anne, H. Bakke, and I. Johansen, 'Optical microphone based on a modulated diffractive lens,' IEEE Photon. Technol. Lett., vol. 15, no. 10, pp. 1431 1433, 2004   DOI   ScienceOn
5 N. Bilaniuk, 'Optical microphone transduction techniques,' Applied Acoustics, vol. 50, no. 1, pp. 35-63, 1997   DOI   ScienceOn
6 K. Nakamura, S. Toda, and M. Yamanouchi, 'A two dimensional optical fibre microphone array with matrix style data readout,' Meas. Sci. Technol., vol. 12, pp. 859 864, 2001   DOI   ScienceOn
7 Y. Kahana, A. Paritsky, A. Kots, and S. Mican, 'Recent advances in optical microphone technology,' Inter Noise 2003, Jeju, Korea, Aug. 2003
8 Microphone Engineering Handbook, Focal, Oxford, U.K., 1994