Laser microphone

Details Laser microphone Laser microphone

1982-03-08

1983-10-25

Martin, John C.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455614, H04R 1702

Patent

active

044121059

ABSTRACT:
A microphone utilizing a laser light for conversion of acoustical sound waves to corresponding electrical signals which may, in turn, be amplified and processed for sound reproduction or recording. The microphone has a cylindrical outer housing with a plurality of circumferentially spaced openings for the entry of sound waves, a cylindrical inner housing positioned concentrically inside the outer housing, a laser for projecting laser light into the space between the outer and inner housings, and a plurality of photo detectors for receiving the sound-modulated laser light to produce electrical signals corresponding to the sound waves entering the openings in the outer housing.

REFERENCES:
patent: 2173994 (1939-09-01), Anderson
patent: 2259511 (1941-10-01), Banks
patent: 2666650 (1954-01-01), MacDonald
patent: 3433959 (1969-03-01), Atwood et al.
patent: 3470329 (1969-09-01), Young
patent: 3622791 (1971-11-01), Bernard

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