| 摘要 |
A fiber-optic current sensor has a reflection interferometer having a fiber-optic supply lead and a coil-shaped optical sensor fiber, the sensor fiber being connected with a first end to the fiber-optic supply lead, and being provided at a second, free end with a reflector. The fiber-optic supply lead has two fiber arms, which interconnect a detector-side and a sensor-side polarization-maintaining coupler. A phase modulator for modulating differential phases of two polarized waves propagating in the supply lead fiber is arranged in one of these two fiber arms, in which it modulates the differential phase of two waves polarized parallel to one another. Moreover, the sensor can change the direction of polarization in one of the two fiber arms, such that optical waves with orthogonally linear polarizations propagate in a segment of the supply lead fiber adjoining the sensor-side coupler. As a result, the advantages of the reflection interferometer can be combined with those of a Sagnac interferometer.
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