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Optical microphone

Patent ·
OSTI ID:872813
 [1]
  1. Manorville, NY
+ Show Author Affiliations
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.
Research Organization:
ASSOC UNIVERSITIES INC
DOE Contract Number:
AC02-76CH00016
Assignee:
Brookhaven Science Associates (Upton, NY)
Patent Number(s):
US 6014239
Application Number:
08/989,350
OSTI ID:
872813
Country of Publication:
United States
Language:
English

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acoustic
acoustic signal
analogous
beam
beam splitter
cooperating
cooperating therewith
detector receives
directly
doppler
doppler frequency
experiences
frequency
frequency shift
heterodyning
index
laser
laser beam
local
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optical
optical microphone
path
photodetector
plurality
pressure
pressure wave
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produce
receives
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reference beam
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reflecting
reflections
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refractive
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shift
signal
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sound pressure
sound wave
sound waves
splitter
splitting
therewith
vary
waves