| 摘要 |
An optical voltage sensor utilizing a Faraday effect based current sensor. The sensor has an optical fiber loop (11) that has light propagating through it. The light has a polarization state or phase that is affected by a displacement current. The displacement current is due to the fiber loop wound on a capacitive standoff (12) that is placed between the voltage to be measured and ground. A photodetector receiving the affected light outputs a signal that indicates displacement current and amounts to a time derivative of the voltage to be measured. The voltage measurement is obtained by integrating the output signal of the detector. The input light to the otpical fiber loop may be modulated with a feedback signal from a signal processor connected to the detector output. The sensor may have a polarimetric or interferometric configuration. |
