Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-06-05
2000-04-25
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
381172, H04B 1012
Patent
active
060550805
ABSTRACT:
In an optical microphone including a light source, a fiber optic cable and a Fabry-Perot interferometer with two reflectors, wherein one end face of the fiber optic cable forms a first reflector and the second reflector is arranged at a distance therefrom and is displaceable by fluctuations in the sound air pressure, the second reflector is the end face of a glass fiber section which is displaceable by induced air pressure by means of a separate diaphragm that is coupled thereto. The light source may be a super luminescent diode (SLD).
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patent: 4412105 (1983-10-01), Muscatell
patent: 4479265 (1984-10-01), Muscatell
patent: 5262884 (1993-11-01), Buchholz
Furstenau et al., "Extrinsic Fabry-Perot Interferometer Fiber-Optic Microphone", IEEE Instrumentation and Measurement Technology Conference, Ottawa, Canada, May 19-21, 1997. pp. 603-606.
Furstenau et al., "Entrinsic Fabry-Perot Interferometer Vibration and Acoustic Sensor Systems for Airport Ground Traffic Monitoring", IEE Proc.-Optoelctron. vol. 144, No. 3, Jun. 1997. pp. 134-144.
"Fiber-Optic Microphone using a Fabry-Perot Interferometer" by H. Naono, M. Matsumoto, K. Fujimura, and and K. Hattori in Proc. 9th Int. Conf. on Optical Fiber Sensors (OFS-9), Florence, 1993, pp. 155-158.
Furstenau Norbert
Jungbluth Werner
Deutsche Forschungsanstalt fur Luft-und Raumfahrt e.V.
Negash Kinfe-Michael
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