Optical microphone

Details Optical microphone Optical microphone

1997-12-12

2000-01-11

Chan, Jason

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359150, 359149, 359151, 359191, 359173, 381172, 381170, H04B 1002, H04B 1000, H04B 1012, H04R 2500

Patent

active

060142391

ABSTRACT:
An optical microphone includes a laser and beam splitter cooperating therewith for splitting a laser beam into a reference beam and a signal beam. A reflecting sensor receives the signal beam and reflects it in a plurality of reflections through sound pressure waves. A photodetector receives both the reference beam and reflected signal beam for heterodyning thereof to produce an acoustic signal for the sound waves. The sound waves vary the local refractive index in the path of the signal beam which experiences a Doppler frequency shift directly analogous with the sound waves.

REFERENCES:
patent: 3470329 (1969-09-01), Young
patent: 4238856 (1980-12-01), Bucaro et al.
patent: 4412105 (1983-10-01), Muscatell
patent: 4479265 (1984-10-01), Muscatell
patent: 5262884 (1993-11-01), Buchholz
patent: 5414509 (1995-05-01), Veligdan
patent: 5910855 (1999-06-01), Thomas
Machine Design, "Optical Microphones Mix Light and Sounds," Dec.12, 1994, p. 71.

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