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Optical fiber cantilever beam magnetic field sensing probe based on giant magnetostrictive film

A giant magnetostrictive, sensor probe technology, applied in the use of magneto-optical equipment for magnetic field measurement, magnetic field size/direction, measurement of magnetic variables and other directions, can solve difficult magnetic field detection, limit sensor detection accuracy, large volume, etc. problem, to achieve the effect of improving the detection accuracy

Inactive Publication Date: 2017-04-19
CHINA JILIANG UNIV
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  • Application Information

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Problems solved by technology

[0002] The current magnetic field sensors are mainly based on mechanisms such as Hall effect, magnetoresistance effect, fluxgate effect, tunnel effect and nuclear magnetic resonance effect. Interference occurs, which limits the further improvement of the detection accuracy of this type of sensor
Traditional magnetic field sensors are bulky and difficult to detect magnetic fields in narrow spaces

Method used

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  • Optical fiber cantilever beam magnetic field sensing probe based on giant magnetostrictive film
  • Optical fiber cantilever beam magnetic field sensing probe based on giant magnetostrictive film
  • Optical fiber cantilever beam magnetic field sensing probe based on giant magnetostrictive film

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Embodiment Construction

[0020] figure 1 with figure 2 Among them, the technical solution adopted in the present invention: a kind of optical fiber cantilever beam magnetic field sensing probe based on giant magnetostrictive film, comprising: optical fiber 1, fixed support end 2, optical fiber cantilever beam, 3, chromium metal film 4, supermagnetic Stretch film 5.

[0021] The optical fiber cantilever beam 3 is located at the end face of the optical fiber 1, has a length of 105 μm-115 μm, a width of 15 μm-30 μm, and a thickness of 3 μm-5 μm, forming an integrated optical fiber structure.

[0022] The length of the fixed support end 2 is 10 μm-20 μm, the width of the fixed support end is the same as the width of the optical fiber cantilever beam 2, the optical fiber cantilever beam and the end face of the optical fiber are connected through the fixed support end, and the optical fiber cantilever beam and the end face of the optical fiber form a Fabry-Perkin beam. Ro resonator.

[0023] The chromiu...

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Abstract

The invention discloses an optical fiber cantilever beam magnetic field sensing probe based on a giant magnetostrictive film, and belongs to the technical field of optical fiber sensors. The optical fiber cantilever beam magnetic field sensing probe comprises an optical fiber, a fixing and supporting end, an optical fiber cantilever beam, a chromium metal film and the giant magnetostrictive film. The optical fiber cantilever beam is arranged on the optical fiber end surface. The optical fiber cantilever beam is connected with the optical fiber end surface through the fixing and supporting end. The optical fiber cantilever beam and the optical fiber end surface form a Fabry-Perot resonant cavity. The chromium metal film and the giant magnetostrictive film are plated on the external surface of the optical fiber cantilever beam in turn. In a magnetic field to be measured, telescoping of the giant magnetostrictive film results in the deflection of the optical fiber cantilever beam or the change of the resonant frequency, and the deflection of the optical fiber cantilever beam or the change of the resonant frequency is detected by the Fabry-Perot resonant cavity so as to measure the size of the external magnetic field.

Description

technical field [0001] The invention relates to a magnetic field sensing probe, in particular to an optical fiber cantilever beam magnetic field sensing probe based on a giant magnetostrictive film. Background technique [0002] The current magnetic field sensors are mainly based on mechanisms such as Hall effect, magnetoresistance effect, fluxgate effect, tunnel effect and nuclear magnetic resonance effect. Interference is generated, which limits the further improvement of the detection accuracy of this type of sensor. Traditional magnetic field sensors are bulky and difficult to detect magnetic fields in narrow spaces. The optical fiber magnetic field sensor does not affect the electromagnetic field to be measured, and has the advantages of corrosion resistance, light weight, small size, etc., which is beneficial to the application in aviation and aerospace fields and narrow spaces. The optical fiber cantilever beam magnetic field sensor combines the characteristics of t...

Claims

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Application Information

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IPC IPC(8): G01R33/032
CPCG01R33/0327
Inventor 刘月明严红梅顾天文张亮
Owner CHINA JILIANG UNIV
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