Micro optical fiber magnetic field sensor based on magnetostrictive material and preparation method

A technology of magnetostrictive materials and magnetic field sensors, which is applied to the use of magneto-optical equipment for magnetic field measurement, the size/direction of the magnetic field, and the direction of instruments. The effect of improving the response sensitivity

Pending Publication Date: 2022-02-08
NANJING UNIV
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Problems solved by technology

[0006] Purpose of the invention: The present invention aims to provide a micro-optical fiber magnetic field sensor based on magnetostrictive materials and its preparation method, so as to solve the problem that the micro-optical fiber is directly coated with a metal magnetostrictive film that is not transparent and the magnetic field response sensitivity is low

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  • Micro optical fiber magnetic field sensor based on magnetostrictive material and preparation method
  • Micro optical fiber magnetic field sensor based on magnetostrictive material and preparation method
  • Micro optical fiber magnetic field sensor based on magnetostrictive material and preparation method

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Embodiment Construction

[0035] The technical solutions of the present invention will be further described below with reference to the accompanying drawings.

[0036] Depend on figure 1 It can be seen that the micro-fiber magnetic field sensor based on magnetostrictive material according to the present invention has a structure including a single-mode fiber pigtail 1, an optical fiber waist region 2, an optical fiber transition region 3, a PDMS film 4, a Terfenol-D film 5, Tapered multimode fiber 6; multimode fiber 6 is tapered to about 9 microns in diameter at the waist region; single-mode fiber pigtail 1 is spliced ​​at both ends of the multimode fiber; PDMS film is cured on the surface of the microfiber by sweep coating as a stress conduction layer ; Terfenol-D film overlaid on PDMS film.

[0037] Among them, the single-mode fiber pigtail 1 is an optical waveguide, preferably a single-mode fiber; the PDMS film 4 is prepared by the PDMS solution sweep coating method, with a preferred thickness of 1...

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Abstract

The invention discloses a micro optical fiber magnetic field sensor based on a magnetostrictive material. The micro optical fiber magnetic field sensor comprises a single-mode optical fiber, a multimode optical fiber, a first thin film layer and a second thin film layer, the two ends of the multimode optical fiber are welded with the single-mode optical fiber, and the welded multimode optical fiber is tapered to obtain a micro optical fiber waist region; the first thin film layer covers the micro optical fiber waist region; the second thin film layer covers the first thin film layer; the first film layer is a polymer film; and the second thin film layer is a magnetostrictive thin film. Sensing of a magnetic field is realized through a method of coating after tapering, the diameter of the waist area is only about 10 microns, and the sensor can enter some relatively closed environments to carry out detection tasks; the polymer film is used as a stress conducting layer, so that light can still pass through the micro-optical fiber after the micro-optical fiber is plated with the metal film, and the response sensitivity of the optical fiber sensor to a magnetic field is improved by utilizing the characteristic of strong evanescent field of the micro-optical fiber.

Description

technical field [0001] The invention relates to a micro-fiber magnetic field sensor and a preparation method, in particular to a micro-fiber magnetic field sensor based on a magnetostrictive material and a preparation method. Background technique [0002] Optical fiber is a low-loss optical waveguide fiber, which has many reliable applications in many fields such as communication and sensing. Optical fiber-based sensor devices have many advantages such as small size, light weight, and resistance to electromagnetic interference, and have been widely used in engineering. There are three main types of optical fiber magnetic field sensors based on Faraday effect, based on diamond NV color center and based on magnetostrictive materials. Terbium-dysprosium-iron alloy is the third-generation magnetostrictive material after nickel-iron and piezoelectric ceramics. When an external magnetic field is applied, the boundaries between its magnetic domains move, and the magnetic domains ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032G02B6/255
CPCG01R33/0327G02B6/2551G02B6/2552
Inventor 徐飞万圣杰陈烨朱润泽曹鸿谦
Owner NANJING UNIV
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