Sagnac interferometer-type fiber-optic current sensor

Details Sagnac interferometer-type fiber-optic current sensor Sagnac interferometer-type fiber-optic current sensor

G - Physics

01

R

G01R 19/00 (2006.01)

Patent

CA 2724608

In one embodiment, a Sagnac interferometer-type fiber-optic sensor includes a synchronous detection circuit to carry out synchronous detection of detected light signal with a phase modulation angular frequency of a phase modulator. A signal processing circuit calculates and outputs the magnitude of current to be measured using the signal detected in the synchronous detection circuit. A phase modulator driving circuit controls the driving of the phase modulator. The phase modulator driving circuit controls a phase modulation depth of the phase modulator so that the amplitude of the second-order harmonics and the fourth-order harmonics obtained by carrying out the synchronous detection of the detected light signal with the phase modulation angular frequency becomes the same.

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