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Magneto-optic current transducer and manufacturing method thereof

A current sensor, magneto-optic technology, applied in the direction of voltage/current isolation, measuring current/voltage, instruments, etc., can solve the problems that affect the measurement accuracy and stability of the system, the process is complicated, and the practicability is not strong, so as to achieve reliability High, simple system design, strong magnetic field effect

Inactive Publication Date: 2010-03-17
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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Problems solved by technology

In this scheme, no measures are taken to fix the magnetization direction of the magneto-optical material, and the drift of the polarization state will affect the measurement accuracy and stability of the entire system
The Chinese patent (application number: 200910056802.3) adopts the magneto-optical recording method and obtains the permanent magnetic domain by optical etching method, but this process is complicated, energy consumption is high, productivity is low, and practicability is not strong

Method used

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  • Magneto-optic current transducer and manufacturing method thereof

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Embodiment Construction

[0020] From the overall principle of structure and function, the present invention puts the magneto-optical material on the copper mesh or molybdenum mesh fixture, grows a layer of permanent magnet film directly on the magneto-optic material, and controls the initial magneto-optic material through the permanent magnet film. Magnetization direction, the initial polarization state zero point in the optical system is obtained, and the rotation angle and intensity of polarized light are directly detected by the azimuth detector, so as to obtain the information of the external current in real time.

[0021] The magneto-optical current sensor includes a light source 1 , a polarizer 2 , a magneto-optic sensing unit, a polarizer 6 and an azimuth detector 7 arranged linearly along the optical path. Wherein: the magneto-optical sensing unit is a layered growth structure of a protective layer 3, a permanent magnetic film 4 and a magneto-optical material 5, and the protective layer 3 faces...

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Abstract

The invention discloses a magneto-optic current transducer and a manufacturing method thereof. The magneto-optic current transducer comprises a light source, a polarizer, a magneto-optic transducer unit, an analyzer and a direction detector which are arranged along the light path, wherein the magneto-optic transducer unit is of an overlapped growth structure composed of a protective layer, a permanent magnetic film and a magneto-optic material layer; the manufacturing method thereof is implemented by firstly preparing clean and dry magneto-optic material, then growing the permanent magnetic film on the magneto-optic material in vacuum, sequentially growing SiN or SiO2 film protective layer on the permanent magnetic film, and finally magnetizing the permanent magnetic film of the magneto-optic transducer unit by using a permanent magnetic machine. The invention uses the permanent magnetic film so that the light path passes through a strong magnetic field and has good parallel degree, thus effectively increasing rotation angle of polarized light and enhancing induction accuracy of the transducer. In addition, the magneto-optic current transducer has less light path elements, more simple and convenient system design, and higher reliability.

Description

technical field [0001] The invention relates to an optical current sensor, in particular to a novel magneto-optical current sensor for measuring high voltage and large current in a power system and a manufacturing method thereof. Background technique [0002] Optical Current Transducer (OCT for short) is a device that directly or indirectly tests current based on the Faraday magneto-optic effect. Compared with the traditional electromagnetic induction current transformer, the use of OCT in the application of high voltage and large current measurement has obvious advantages: 1. It does not contain oil and has no explosion hazard; 2. It is completely isolated from the high voltage line and meets the insulation requirements. Safe and reliable operation; 3. Does not contain iron core, no magnetic saturation, ferromagnetic resonance and hysteresis; 4. Does not contain AC coils, there is no risk of output coil open circuit, and can measure DC; 5. Anti-electromagnetic interference;...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R15/24
Inventor 焦新兵蒋春萍
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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