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Title: 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:
 [1]
  1. (Manorville, NY)
Issue Date:
Research Org.:
ASSOC UNIVERSITIES INC
OSTI Identifier:
872813
Patent Number(s):
6014239
Application Number:
08/989,350
Assignee:
Brookhaven Science Associates (Upton, NY) BNL
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}
}

Patent:

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