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Feasibility of Guided-Wave Optical Microphone Based on Elasto-Optic Effect
Feasibility of Guided-Wave Optical Microphone Based on Elasto-Optic Effect
Nikkuni, Hiroyuki
Ohkawa, Masashi
Sekine, Seishi
Sato, Takashi
Copyright 2005 Society of Photo-Optical Instrumentation Engineers
optical microphone
guided-wave optics
glass
diaphragm
elasto-optic effect
In this paper, the feasibility of a glass-based guided-wave optical microphone is described. The optical microphone consists of a rectangular diaphragm and a straight waveguide on the diaphragm. The sensitivity of the microphone and the resonance frequency of the diaphragm are dependent on the diaphragm dimensions. In this study, to confirm operation of the proposed optical microphone, the target values for phase sensitivity and resonance frequency were set at 1.3 mrad/Pa and 5 kHz, respectively. By design considerations, the diaphragm dimensions were determined to be 16 mm × 16 mm × 0.15 mm. After fabrication, a sound wave of 1 kHz and 25 Pa, corresponding to 122 dB-SPL (sound pressure level), was applied to the microphone. In the experiment, the intensity-modulated output with the same frequency as the applied sound wave was obtained, but the observed output was unexpectedly caused by misalignment of the optical components due to mechanical vibration. The estimated output signal by the normal operation of the microphone for a sound pressure of 25 Pa was 1/10 - 1/100 of the noise level, according to the measured output characteristic to static pressure. In order to detect normal speech ranging from 55 to 65 dB-SPL, the S/N ratio should be improved by a factor of more than 104.
Optomechatronic sensors and instrumentation : 5-7 December 2005 : Sapporo, Japan. : Dec 2005, Sapporo, Japan
International Society for Optical Engineering, SPIE
2005-12
eng
conference paper
http://hdl.handle.net/10191/31207
https://niigata-u.repo.nii.ac.jp/records/31040
info:doi/10.1117/12.649176
AA10619755
0277786X
Proceedings of SPIE - the International Society for Optical Engineering
Proceedings of SPIE - the International Society for Optical Engineering
6049
604907-1
604907-8
https://niigata-u.repo.nii.ac.jp/record/31040/files/6049_604907.pdf
application/pdf
893.3 kB
2019-08-26