All-fiber current monitoring device based on Faraday effect

A Faraday effect and current monitoring technology, which is applied in the direction of measuring devices, using optical devices to transmit sensing components, voltage/current isolation, etc., can solve the problems of low beam deflection accuracy, high economic cost of two photodetectors, and current monitoring results. Inaccurate and other problems, to achieve the effect of small electromagnetic interference, high accuracy, and reduce economic costs
CN101793916AInactive Publication Date: 2010-08-04HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2010-08-04
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an all-fiber current monitoring device based on a Faraday effect, which relates to the field of current monitoring and solves the problems of inaccurate current monitoring results because of low accuracy rate of light beam deflection judged by traditional current monitoring equipment by using a digital signal and high economic cost by using two photo detectors. The device comprises a light source system, a half-wave plate, a first fiber mutual inductor, a second fiber mutual inductor, a first semi-reflecting semi-transmitting mirror, a second total reflection mirror and a photo detector, wherein the light source system emits a first light beam to the first fiber mutual inductor and a first polarized light output by the first fiber mutual inductor is input to the photo detector through the first semi-reflecting semi-transmitting mirror; the light source system further emits a second light beam, the second light beam is emitted to the second fiber mutual inductor after being transmitted through the half-wave plate, a second polarized light output by the second fiber mutual inductor is input to the first semi-reflecting semi-transmitting mirror through the second total reflection mirror and the first semi-reflecting semi-transmitting mirror outputs reflected lights to the photo detector. The invention is applied to current monitoring.
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Description

technical field

[0001] The invention relates to the field of current monitoring, in particular to an all-optical fiber current monitoring device based on the Faraday effect. Background technique

[0002] The current optical current monitoring instrument is a photodetector in a fiber optic current transformer. Because the dark current in the photodetector changes under the current mutual inductance, the light beam passing through the two photodetectors changes. The detector then compares the received two beams of light with digital signals. If there is a difference between the two digital signals, it means that the current is abnormal during the transmission of light. However, the cost of using two photodetectors is high, and they are subject to strong electromagnetic interference during use, and the errors that occur after the optical signal is converted into an electrical signal are greatly affected, so the accuracy of the two beam deflections obtained is low, making the cu...

Claims

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