Optical microphone
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.
- Inventors:
-
- Manorville, NY
- Issue Date:
- Research Org.:
- Associated Universities, Inc., Upton, NY (United States)
- OSTI Identifier:
- 872813
- Patent Number(s):
- 6014239
- Application Number:
- 08/989,350
- Assignee:
- Brookhaven Science Associates (Upton, NY)
- Patent Classifications (CPCs):
-
H - ELECTRICITY H04 - ELECTRIC COMMUNICATION TECHNIQUE H04B - TRANSMISSION
H - ELECTRICITY H04 - ELECTRIC COMMUNICATION TECHNIQUE H04R - LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS
- DOE Contract Number:
- AC02-76CH00016
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- optical; microphone; laser; beam; splitter; cooperating; therewith; splitting; reference; signal; reflecting; sensor; receives; reflects; plurality; reflections; sound; pressure; waves; photodetector; reflected; heterodyning; produce; acoustic; vary; local; refractive; index; path; experiences; doppler; frequency; shift; directly; analogous; frequency shift; pressure waves; sound waves; reference beam; beam splitter; laser beam; refractive index; signal beam; acoustic signal; pressure wave; reflected signal; doppler frequency; sound pressure; optical microphone; sound wave; detector receives; cooperating therewith; /359/381/
Citation Formats
Veligdan, James T. Optical microphone. United States: N. p., 2000.
Web.
Veligdan, James T. Optical microphone. United States.
Veligdan, James T. Tue .
"Optical microphone". United States. https://www.osti.gov/servlets/purl/872813.
@article{osti_872813,
title = {Optical microphone},
author = {Veligdan, James T},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {1}
}
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