Optical fiber sensing systems having acoustical optical deflection and; modulation devices
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United States of America Patent
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Dec 6, 1988
Grant Date -
N/A
app pub date -
Feb 24, 1987
filing date -
Feb 24, 1987
priority date (Note) -
Expired
status (Latency Note)
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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.
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