Sensor for optically sensing air borne acoustic waves

Details Sensor for optically sensing air borne acoustic waves Sensor for optically sensing air borne acoustic waves

2005-08-02

2005-08-02

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

By light interference

Having light beams of different frequencies

C356S517000, C073S657000

Reexamination Certificate

active

06924895

ABSTRACT:
The present invention relates to an optical sensor of air borne acoustic waves. The sensor comprises means for producing mutually coherent optical sampling and reference beams, which may be combined to form an intermediate frequency carrier, the sampling beam being exposed to the acoustic field, in which acoustic wave induced density variations occur. These density variations produce a variation in the index of refraction and thereupon a phase modulation of the sampling beam. This phase modulation may be recovered by an optical detector and a phase detector as an electrical signal representative of the acoustic signal.The invention has application to security systems.

REFERENCES:
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patent: 3745812 (1973-07-01), Korpel
patent: 3800906 (1974-04-01), Albares
patent: 4265122 (1981-05-01), Cook et al.
patent: 4313185 (1982-01-01), Chovan
patent: 4422167 (1983-12-01), Shajenko
patent: 4551018 (1985-11-01), Mannava et al.
patent: 4744625 (1988-05-01), Lanzisera
patent: 6714306 (2004-03-01), Chovan et al.

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