Low-noise fiber optic sensor utilizing a laser source

Details Low-noise fiber optic sensor utilizing a laser source Low-noise fiber optic sensor utilizing a laser source

2011-03-22

2011-03-22

Lyons, Michael A (Department: 2877)

Optics: measuring and testing

By light interference

Rotation rate

Reexamination Certificate

active

07911619

ABSTRACT:
A fiber-optic sensor includes an optical fiber coil and a laser source optically coupled to the coil. Light from the source is transmitted to the coil as a first signal propagating along the coil in a first direction and a second signal propagating along the coil in a second direction opposite to the first direction. The optical paths of the first signal and the second signal are substantially reciprocal with one another and the first signal and the second signal are combined together after propagating through the coil to generate a third signal. The laser source is frequency-modulated or can have a coherence length longer than a length of the coil.

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