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Optical microphone based on a reflective micromirror diaphragm
Author(s) -
Song JuHan,
Gu HyunMo,
Park HyunJung,
Lee SangShin
Publication year - 2006
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.21450
Subject(s) - diaphragm (acoustics) , microphone , optics , multi mode optical fiber , materials science , optical fiber , microwave , acoustics , engineering , physics , telecommunications , sound pressure , loudspeaker
An optical microphone incorporating a reflective diaphragm and a fiber‐optic head is demonstrated. The diaphragm is made of a micromirror membrane which is suspended by a silicon bar connected to a frame, allowing for displacement induced by acoustic waves. A compact and simple optical head is implemented by exploiting a single multimode fiber. For the assembled microphone, the static characteristics are investigated in order to find the operation point, defined as the optimum distance between the head and the diaphragm, and a flat frequency response with a variation of ∼2 dB for the range of 0.1 to 2 kHz is accomplished. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 707–709, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21450.