| 摘要 |
An optical fiber current sensor is provided with a polarization separation element (13) and a signal processing section (15). The polarization separation element separates light outputted from a sensor fiber (11) into two polarization components whose polarization surfaces orthogonally intersect with each other. The signal processing section converts the two separated polarization components into a first signal (Px) and a second signal (Py), respectively, by photoelectric conversion, and multiplies a ratio (Sx), i.e., a ratio of direct current components to alternating current components of the first signal (Px), and a ratio (Sy), i.e., a ratio of direct current components to the alternating current components of the second signal (Py), by different coefficients, respectively, and calculates the difference value between the obtained values.
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