Optical fiber sensing systems having acoustical optical deflecti

Details Optical fiber sensing systems having acoustical optical deflecti Optical fiber sensing systems having acoustical optical deflecti

1987-02-24

1988-12-06

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

350358, G01B 902

Patent

active

047892412

ABSTRACT:
There is provided by this invention an optical sensing system utilizing a Sagnac interferometer having a frequency shifter within the Sagnac counterpropagating loop that is generally comprised of a plurality of acoustic transducers mounted on acousto-optical material to frequency shift and beamsplit a light beam simultaneously within the material while at the same time having the capability of switching between an upshifted or downshifted frequency in either a Bragg or Raman-Nath mode of operation without realigning the optical beams. The acousto-optical material has a special configuration to eliminate back reflections of the acoustic waves that can interact with the light beam. In addition, special alignment of the transducers with dampening configurations also serves to prevent back reflections of the acoustic wave from interacting with the light beam.

REFERENCES:
patent: 4381887 (1983-05-01), Guerin

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