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Optical microphone

United States Patent

6,014,239
January 11, 2000
View the Complete Patent at the US Patent & Trademark Office
Brookhaven National Laboratory - Visit the Office of Technology Commercialization and Partnerships Website
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.
Veligdan; James T. (Manorville, NY)
Brookhaven Science Associates (Upton, NY)
08/ 989,350
December 12, 1997
This invention was made with Government support under contract number DE-AC02-76CH00016, awarded by the U.S. Department of Energy. The Government has certain rights in the invention.