Ring cavity type all-fiber current sensor

A technology of current sensor and annular cavity, which is applied in the direction of voltage/current isolation, measuring current/voltage, instruments, etc., and can solve the problems of increasing Faraday phase shift and increasing the additional loss of error sources, etc.

Inactive Publication Date: 2015-05-06
ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD +1
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  • Abstract
  • Description
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Problems solved by technology

[0004] The present invention aims at the existing all-fiber-optic current sensor to increase the error source and extra loss caused by the Faraday phase shift, and provides a ring-cavity all-fiber-optic current sensor, which can significantly increase the Faraday phase shift caused by the current, and at the same time Reduce the cost and loss, improve the small current measurement accuracy and measurement range of the fiber optic current sensor

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  • Ring cavity type all-fiber current sensor
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  • Ring cavity type all-fiber current sensor

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Embodiment Construction

[0022] The present invention will be described below in conjunction with the accompanying drawings.

[0023] The invention relates to an annular cavity type all-fiber current sensor, which comprises a phase modulator, a delay coil, a 1 / 4 wave plate and an optical fiber annular cavity sequentially arranged on the optical path of incident light, wherein the optical fiber annular cavity, the 1 / 4 wave The plate, the delay coil and the phase modulator are also arranged in turn on the optical path of the return light. The fiber ring cavity includes a sensing fiber and a coupler. The port on one side of the coupler is connected to the 1 / 4 wave plate, and the other side of the coupler The two ports of the sensor are respectively connected to the two ends of the sensing fiber, and the splitting ratio of the coupler is 1:99 to 15:85; on the optical path of the incident light, the two beams of linearly polarized light formed by the phase modulator and the delay coil pass through 1 After ...

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Abstract

The invention relates to a ring cavity type all-fiber current sensor, including a phase modulator, a delay coil, a 1/4 wave plate and a fiber ring cavity which are sequentially arranged on the light path of incident light, wherein the fiber ring cavity, the 1/4 wave plate, the delay coil and the phase modulator are also sequentially arranged on the light path of return light; the fiber ring cavity includes a sensing fiber and a coupler, the port on one side of the coupler is connected with the 1/4 wave plate, two ports on the other side of the coupler are respectively connected with two ends of the sensing fiber, and the splitting ratio of the coupler is 1:99 to 15:85. According to the ring cavity type all-fiber current sensor, the Faraday phase shift caused by current can be significantly increased, and meanwhile the cost is reduced and the small current measurement accuracy and measurement range of the fiber current sensor are improved.

Description

technical field [0001] The invention relates to the technical field of power equipment, in particular to an all-fiber current sensor based on a fiber optic ring cavity. Background technique [0002] Optical fiber current sensor is a new type of current sensor based on Faraday effect, which is used in power system to realize relay protection and electric energy measurement. Compared with traditional current sensors, fiber optic current sensors have many advantages, such as large dynamic range, anti-electromagnetic interference, simple structure, good linearity, no saturation phenomenon, etc. With the increase of voltage and current levels, the traditional electromagnetic current sensor is gradually unable to meet the measurement requirements, and the fiber optic current sensor has attracted more and more attention due to its unique advantages. [0003] The all-fiber current sensor measures current based on the Faraday effect, and its calculation formula is: in is the Far...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/24G01R19/00
Inventor 徐长宝高吉普肖小兵鲁彩江宋奎岩周炜刘东伟李永兵
Owner ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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