Fibre optic measuring device, rate gyro, stabilization system and magnetic field or current sensor
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United States of America Patent
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Dec 14, 1993
Grant Date -
N/A
app pub date -
May 13, 1991
filing date -
May 18, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a fiber optic measuring device in which the variation in a measured parameter engenders a phase difference between two waves. It comprises a SAGNAC ring interferometer (2) in which two counter-propagating waves propagate; a polarization splitter (6) spatially splits the two polarizations which will propagate in the interferometer (2), interferometer (2) comprises a polarization conserving birefringent fiber (7) having two ends having neutral birefringence axes, each of the ends of the polarization conserving fiber (7) being connected to one of the gates (6b) and (6c) of the polarization splitter (6). It comprises a birefringent component, placed ahead of the polarization splitter (6) and introducing a path difference greater than the coherence length of the source (1) between the two polarized waves.
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