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Optical fiber magnetic field sensor

A magnetic field sensor and optical fiber technology, applied in the field of optical sensors, can solve the problems of poor anti-electromagnetic interference, low sensitivity and high cost, and achieve the effects of low cost, high sensitivity and strong practicability

Pending Publication Date: 2022-02-25
HANDAN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional electrical magnetic field sensors include: induction coil magnetometers, magnetoresistive sensors, fluxgate magnetometers, proton magnetometers, etc., which have the disadvantages of large size, low sensitivity, poor anti-electromagnetic interference ability, and high cost, and are not suitable for ultra-high current real-time Dynamic detection does not meet the requirements of magnetic field detection in some specific occasions

Method used

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  • Optical fiber magnetic field sensor

Examples

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Comparison scheme
Effect test

Embodiment 1

[0018] Such as figure 1 A fiber optic magnetic field sensor is shown, including: a package shell obtained by curing a composite of PDMS and magnetostrictive material TbDyFe, and a micro-nano fiber Micro / nano fiber packaged in the package shell, and a micro-nano fiber Micro / nano fiber It is a double-tapered optical fiber mode interferometer formed after the single-mode optical fiber is fused and tapered. The two ends extend to the outside of the packaging shell. 6. The second micro-fiber tapered area 7 and the micro-fiber uniform area 8 are formed, and the first micro-fiber tapered area 6 and the second micro-fiber tapered area 7 are respectively located at the two ends of the micro-fiber uniform area 8, so The first micro-fiber end region 4 is located at the outer end of the first micro-fiber tapered region 6 , and the second micro-fiber end region 5 is located at the outer end of the second micro-fiber tapered region 7 . When the optical signal passes through the first micro...

Embodiment 2

[0021] Such as figure 1 When preparing an optical fiber magnetic field sensor as shown, after uniformly mixing PDMS 2 and magnetostrictive material TbDyFe 3, pour it into the groove where the micro-nano optical fiber Micro / nano fiber 1 is fixed, and place it in a high temperature temperature control of 100°C. Stand in the box and solidify to form a micro-nano optical fiber magnetic field sensor with elastic and magnetostrictive properties. Micro-nano fiber Micro / nanofiber is a double-tapered fiber mode interferometer formed by fused and tapered single-mode fiber. The two ends extend to the outside of the packaging shell. The first micro-fiber taper region 6, the second micro-fiber taper region 7 and the micro-fiber homogeneous region 8 are formed, and the first micro-fiber taper region 6 and the second micro-fiber taper region 7 are respectively located in the micro-fiber homogeneous region 8, the first micro-fiber end region 4 is located at the outer end of the first micro-f...

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Abstract

The invention discloses an optical fiber magnetic field sensor. Theoptical fiber magnetic field sensor comprises a packaging shell and a micro-nano optical fiber Micro / nano fiber, the packaging shell is obtained by curing a compound of PDMS (Polydimethylsiloxane) and a magnetostrictive material TbDyFe, the micro-nano optical fiber Micro / nano fiber is packaged in the packaging shell, the micro-nano optical fiber Micro / nano fiber is a biconical optical fiber mode interferometer formed by fusing and tapering a single-mode optical fiber, and two ends of the micro-nano optical fiber Micro / nano fiber extend out of the packaging shell. Based on the basic principle of magnetostrictive stress change, a magnetostrictive material is uniformly mixed into an elastic PDMS structure, an external magnetic field acts on the magnetostrictive material to cause tiny deformation of a sensitive area, and acts on the sensitive area of the biconical fiber optic interferometer to form a wavelength coded magnetic field sensing element. The optical fiber magnetic field sensor can be used for low-intensity magnetic field measurement within 200mT, and has the characteristics of high sensitivity, good repeatability, simple preparation and measurement mode, low cost and relatively high practicability.

Description

technical field [0001] The invention relates to the technical field of optical sensors, in particular to an optical fiber magnetic field sensor based on magnetostrictive materials. Background technique [0002] A magnetic field sensor is a sensor device that converts the performance changes of magnetic sensitive elements caused by external factors such as magnetic field, current, stress, temperature, and pressure into electrical signals, and detects changes in corresponding physical quantities in this way. At present, weak magnetic field detection plays an important role in many fields. Traditional electrical magnetic field sensors include: induction coil magnetometers, magnetoresistive sensors, fluxgate magnetometers, proton magnetometers, etc., which have the disadvantages of large size, low sensitivity, poor anti-electromagnetic interference ability, and high cost, and are not suitable for ultra-high current real-time Dynamic detection does not meet the requirements of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/032
CPCG01R33/0327
Inventor 谢飞梁丽丽贾灵艳李燕李国玉
Owner HANDAN COLLEGE
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