Miniature optical fiber current sensor probe and making method thereof

A fiber-optic current sensing and fiber-optic current technology, which is applied in cladding optical fiber, voltage/current isolation, optics, etc., can solve the problems of reducing system sensitivity, system accuracy is easily affected by ambient temperature, etc., and achieve the effect of improving sensitivity

Inactive Publication Date: 2010-12-15
WUHAN UNIV OF TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The fiber optic current sensor based on the Faraday effect greatly reduces the sensitivity of the system due to the existence of birefringence in the fiber, and the system accuracy is easily affected by the ambient temperature

Method used

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  • Miniature optical fiber current sensor probe and making method thereof
  • Miniature optical fiber current sensor probe and making method thereof
  • Miniature optical fiber current sensor probe and making method thereof

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Embodiment Construction

[0025] The implementation of the fiber optic current sensor in the invention will be described in further detail below in conjunction with the accompanying drawings

[0026] The micro fiber optic current sensor probe structure of the present invention is as figure 2 As shown, the probe is composed of a D-type fiber grating 9 sputtered with a TbDyFe thin film 10 and an uncoated reference grating 8 with the same central wavelength butt-welded.

[0027] Two fiber gratings with the same central wavelength are prepared in a single-mode fiber by phase mask method. One acts as a reference grating 8 for temperature compensation; the other acts as a D-type fiber grating 9 (sensing grating) and acts as a sensitive probe. In order to improve the sensitivity of the sensor probe, the fiber grating as a sensitive probe is fixed on a polishing machine for polishing, and a part of the fiber cladding 12 is removed, so that the fiber grating is polished close to the fiber core 11, so that a r...

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Abstract

The invention relates to a miniature optical fiber current sensor probe and a making method thereof. The probe is formed by butt welding a D type fiber bragg grating (9) sputtered with a TbDyFe thin film (10) and an uncoated reference grating (8) with the same central wavelength as the D type fiber bragg grating (9), wherein the D type fiber bragg grating (9) sputtered with the TbDyFe thin film is formed by sputtering a layer of giant magnetostrictive material TbDyFe thin film on a fiber bragg grating with polished sides, and the thickness of the thin film is 2-20 mum. The miniature optical fiber current sensor probe is made by combining a magnetostrictive TbDyFe thin film sensitive to a magnetic field with an anti-electromagnetic interference D type fiber bragg grating. Because a magnetic-control sputtering process, a heat processing process and a temperature compensation technique are adopted, the accuracy and the sensitivity of a sensor are greatly improved, and the volume of the sensor probe is greatly reduced, thereby the sensor probe is beneficial to the miniaturization of an optical fiber current sensor.

Description

technical field [0001] The invention belongs to the intersecting fields of optical fiber microprocessing technology, film material preparation technology and photoelectric detection technology, and relates to an optical fiber current sensor, in particular to a miniature optical fiber current sensor probe and a preparation method thereof. Background technique [0002] With the development of modern electric power in the direction of high voltage and large capacity, there are requirements for miniaturization, automation and high reliability of current sensors that play a role in protection and monitoring in power systems. Traditional electromagnetic current transformers have encountered great difficulties and challenges. The most important of these is the insulation problem. The increase in voltage brings more complex and even difficult difficulties to the insulation technology; the second is the large size and sharp increase in weight, which brings many difficulties to produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/24G02F1/095G02B6/02
Inventor 杨明红代吉祥李小兵
Owner WUHAN UNIV OF TECH
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