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F-P structure-based optical fiber micro-suspension bridge magnetic field sensing probe

A technology of sensing probes and optical fibers, which is applied to the use of magneto-optical equipment for magnetic field measurement, the size/direction of the magnetic field, and the measurement of magnetic variables. It can solve problems affecting the detection accuracy of sensors, improve detection accuracy and measurement range, The effect of small size and simple device structure

Active Publication Date: 2017-07-07
CHINA JILIANG UNIV
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Problems solved by technology

[0003] These traditional magnetic field sensors all require electrical signal excitation, and the magnetic field generated by electrical signal excitation usually produces additional interference to the measured magnetic field, thus affecting the further improvement of the detection accuracy of this type of sensor

Method used

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  • F-P structure-based optical fiber micro-suspension bridge magnetic field sensing probe
  • F-P structure-based optical fiber micro-suspension bridge magnetic field sensing probe
  • F-P structure-based optical fiber micro-suspension bridge magnetic field sensing probe

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Embodiment Construction

[0019] The optical fiber micro-suspended bridge 3 based on the intermediate reflector is located at the end face of the optical fiber 1, and the length is 95 μm-105 μm, wherein the length of the intermediate reflector is 35 μm-45 μm, the width is 35 μm-45 μm, and the thickness of the micro-suspended bridge is 3 μm-5 μm. Form an optical fiber integrated structure.

[0020] The length of the fixed support end 2 is 10 μm-15 μm, the width of the fixed support end is 20 μm-30 μm the same as the width of the optical fiber micro-suspension bridge 3, and the height is 5 μm-10 μm. The fiber suspended micro-bridge is connected to the fiber end face through the fixed end, and the fiber micro-suspended bridge based on the intermediate reflector and the fiber end face form a Fabry-Perot resonant cavity.

[0021] The chromium metal film 4 is plated on the outer surface of the optical fiber micro-suspension bridge 3, and its thickness is 30nm-50nm. As a buffer layer of the giant magnetostric...

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Abstract

The present invention relates to the magnetic field measurement in a narrow space and provides an F-P structure-based optical fiber micro-suspension bridge magnetic field sensing probe. The sensing probe structurally comprises an optical fiber, a fixed support end, an optical fiber micro-suspension bridge, an intermediate reflector, a Fabry-Perot resonant cavity, a chromium metal film and a giant magnetostrictive film. The optical fiber micro-suspension bridge is arranged at the end surface of the optical fiber and is connected with the optical fiber through the fixed support end. The optical fiber micro-suspension bridge and the end surface of the optical fiber together form the Fabry-Perot resonant cavity. The chromium metal film and the giant magnetostrictive film are sequentially plated on the outer surface of the optical fiber micro-suspension bridge. According to the technical scheme of the invention, the requirements of a high-precision detection magnetic field can be met based on the Fabry-Perot resonant cavity. The two pole plates of the Fabry-Perot resonant cavity are effectively ensured to be parallel to each other by the intermediate reflector. Meanwhile, the measurement range is increased.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and relates to an optical fiber micro-suspension bridge magnetic field sensing probe based on an F-P structure. Background technique [0002] Current magnetic field sensors are mainly based on mechanisms such as Hall effect, magnetoresistance effect, and fluxgate effect. The Hall effect is to use the tendency of free electrons to gather on both sides under the action of an external magnetic field to form a potential difference proportional to the magnetic induction intensity; the magnetoresistive sensor is another kind of magnetic sensor derived from the Hall sensor. The Hall sensor is generally the same, but the sensor has a different mechanism of action on the magnetic field. The movement direction of the carrier in the sensor is in the same plane as the detected magnetic field; The magnetic properties change to modulate the measured magnetic field, and the measurement of the ext...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032
CPCG01R33/0327
Inventor 刘月明施阳阳韩晓红
Owner CHINA JILIANG UNIV
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