CN111880126A - Optical fiber magnetic field detector - Google Patents
Optical fiber magnetic field detector Download PDFInfo
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- CN111880126A CN111880126A CN202010758214.0A CN202010758214A CN111880126A CN 111880126 A CN111880126 A CN 111880126A CN 202010758214 A CN202010758214 A CN 202010758214A CN 111880126 A CN111880126 A CN 111880126A
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- magnetic field
- noble metal
- metal particles
- fiber core
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
- G01R33/0327—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect with application of magnetostriction
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The invention provides an optical fiber magnetic field detector, wherein noble metal particles are arranged on the end surface of a fiber core, and a magnetostrictive layer covers the noble metal particles and the end surface of the fiber core. Under the action of a magnetic field to be detected, the magnetostrictive layer stretches, so that the position of the noble metal particles relative to other noble metal particles or the end face of the fiber core is changed, the reflection characteristic of the end face of the fiber core is further changed, and magnetic field detection is realized through the change of the reflection characteristic. In the invention, the fiber core has small size, and the magnetic field measurement in a narrow space can be realized by penetrating the end surface of the fiber core into the space to be measured, so the invention has the characteristic of small equipment size. In addition, the invention also has the advantage of high magnetic field detection sensitivity because the reflection of the end face of the fiber core is closely related to the environment of the end face of the fiber core.
Description
Technical Field
The invention relates to the field of magnetic field detection, in particular to an optical fiber magnetic field detector.
Background
The conventional magnetic field detection is mostly based on the hall effect, the magnetoresistance effect, the fluxgate effect and the tunneling effect. The traditional magnetic field detection equipment is large in size and cannot go deep into a narrow space for detection.
Disclosure of Invention
To solve the above problems, the present invention provides an optical fiber magnetic field detector, comprising: the magnetic field detection device comprises a light source, a light detector, a fiber core, noble metal particles and a magnetostrictive layer, wherein the noble metal particles are arranged on the end face of the fiber core, the magnetostrictive layer covers the noble metal particles and the end face of the fiber core, the light source is a continuous spectrum light source, light emitted by the light source is coupled into the fiber core, light reflected by the end face of the fiber core is coupled into the light detector, and the magnetic field detection is realized by measuring the reflection spectrum of the end face of the fiber core.
Still further, the number of noble metal particles is more than 1.
Further, the end face of the core is provided with a pit, and the noble metal particles are not disposed in the pit.
Further, the width and depth of the pits are smaller than the diameter and radius of the noble metal particles, respectively.
Further, the number of pits is more than one.
Further, the end surface of the core is concave.
Further, the material of the noble metal particles is gold, silver, platinum.
Further, the noble metal particles are spherical in shape.
Further, the noble metal particles have a diameter greater than 20 nanometers and less than 100 nanometers.
Furthermore, the material of the magnetostrictive layer is nickel alloy, iron-based alloy and ferrite material.
The invention has the beneficial effects that: the invention provides an optical fiber magnetic field detector, wherein noble metal particles are arranged on the end surface of a fiber core, and a magnetostrictive layer covers the noble metal particles and the end surface of the fiber core. Under the action of a magnetic field to be detected, the magnetostrictive layer extends along the direction vertical to the fiber core, so that the position of the noble metal particles relative to other noble metal particles or the end surface of the fiber core is changed, the reflection characteristic of the end surface of the fiber core is further changed, and the magnetic field detection is realized through the change of the reflection characteristic. In the invention, the fiber core has small size, and the magnetic field measurement in a narrow space can be realized by penetrating the end surface of the fiber core into the space to be measured, so the invention has the characteristic of small equipment size. In addition, the invention also has the advantage of high magnetic field detection sensitivity because the reflection of the end face of the fiber core is closely related to the environment of the end face of the fiber core.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a fiber optic magnetic field sensor.
FIG. 2 is a schematic view of yet another fiber optic magnetic field sensor.
FIG. 3 is a schematic diagram of yet another fiber optic magnetic field sensor.
In the figure: 1. a fiber core; 2. noble metal particles; 3. a magnetostrictive layer; 4. and (4) pits.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description of the embodiments, structural features and effects of the present invention will be made with reference to the accompanying drawings and examples.
Example 1
The invention provides an optical fiber magnetic field detector which comprises a light source, an optical detector, a fiber core 1, noble metal particles 2 and a magnetostrictive layer 3. As shown in fig. 1, the noble metal particles 2 are disposed on the end surface of the core 1, and the magnetostrictive layer 3 covers the noble metal particles 2 and the end surface of the core 1. That is, the magnetostrictive layer 3 has a certain thickness on the end surface side of the noble metal particles 2 away from the core 1. The material of the noble metal particles 2 is gold, silver, platinum. The noble metal particles 2 have a spherical shape. The magnetostrictive layer 3 is made of nickel alloy, iron-based alloy and ferrite material. The light source is a continuous spectrum light source, and the spectrum range covers visible light and near infrared light. When the optical fiber is used, light emitted by the light source is coupled into the fiber core 1 through the coupler and the optical splitter, light reflected by the end face of the fiber core 1 is coupled into the optical detector after being split by the splitter, and the coupler and the splitter are both designed conventionally and are not limited. Finally, magnetic field detection is achieved by measuring the reflection spectrum of the end face of the fiber core 1.
When the device is applied, under the action of a magnetic field to be detected, the magnetostrictive layer 3 extends along the direction vertical to the fiber core 1, so that the position of the noble metal particles 2 relative to the end face of the fiber core 1 is changed, the reflection characteristic of the end face of the fiber core 1 is further changed, and magnetic field detection is realized through the change of the reflection characteristic. In the invention, the fiber core 1 has small size, and the magnetic field measurement in a narrow space can be realized by penetrating the end surface of the fiber core 1 into the space to be measured, therefore, the invention has the characteristic of small equipment size. In addition, the invention also has the advantage of high magnetic field detection sensitivity because the reflection of the end face of the fiber core 1 is closely related to the environment of the end face of the fiber core 1.
Further, the number of the noble metal particles 2 is more than 1. Thus, when the magnetostrictive layer 3 is elongated in the direction perpendicular to the fiber core 1, the distance between adjacent noble metal particles 2 is changed, thereby changing the surface plasmon resonance of the noble metal particles 2 and thus changing the reflection characteristics of the end surface of the fiber core 1. Because the surface plasmon resonance of the noble metal particles 2 is very sensitive to the distance between the noble metal particles 2, when a plurality of noble metal particles 2 are provided, the reflection characteristic of the end surface of the fiber core 1 has more characteristics, the reflection characteristic of the end surface of the fiber core 1 is more sensitive to a magnetic field to be detected, and the magnetic field detection with higher sensitivity can be realized.
Further, the noble metal particles 2 have a diameter of more than 20 nm and less than 100 nm. As described above, the surface plasmon resonance wavelength of the noble metal particle 2 is in the visible light region, and the absorption of visible light by the core 1 is small.
Example 2
In example 1, as shown in fig. 2, the end face of the core 1 was provided with the pits 4, and the noble metal particles 2 were not provided in the pits 4. Thus, the contact area between the magnetostrictive layer 3 and the end face of the core 1 is increased, and the effect of the magnetostrictive layer 3 on the end face of the core 1 is increased. When the magnetostrictive layer 3 extends in the direction perpendicular to the fiber core 1, the magnetostrictive layer 3 can drive the fiber core 1 and the noble metal particles 2 to move more, so that the distance between the noble metal particles 2 is changed more, the reflection characteristic of the end face of the optical fiber 1 is changed more, and the sensitivity of magnetic field detection is improved.
Further, the width and depth of the pits 4 are smaller than the diameter and radius of the noble metal particles 2, respectively. The number of pits 4 is more than one. Thus, the pits 4 do not change the coupling of the noble metal particles 2 with the end face of the core 1 too much, and the presence of the pits 4 only changes the mechanical action of the magnetostrictive layer 3 with the end face of the core 1.
Example 3
In example 1, as shown in fig. 3, the end surface of the core 1 is concave so that a depressed portion is formed on the end surface of the core 1. The noble metal particles 2 are disposed on the surface of the concave end face. The magnetostrictive layer 3 is also filled into the recess. When the magnetostrictive layer 3 extends in the direction perpendicular to the fiber core 1 under the action of a magnetic field to be detected, the extrusion force on the end surface of the fiber core 1 is larger, the shape of the end surface of the fiber core 1 can be changed more, the distance between the noble metal particles 2 can be changed more, the reflection characteristic of the end surface of the fiber core 1 can be changed more, and the sensitivity of magnetic field detection is improved.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. A fiber optic magnetic field sensor, comprising: the magnetic field detection device comprises a light source, an optical detector, a fiber core, noble metal particles and a magnetostrictive layer, wherein the noble metal particles are arranged on the end face of the fiber core, the magnetostrictive layer covers the noble metal particles and the end face of the fiber core, the light source is a continuous spectrum light source, light emitted by the light source is coupled into the fiber core, light reflected by the end face of the fiber core is coupled into the optical detector, and magnetic field detection is realized by measuring a reflection spectrum of the end face of the fiber core.
2. The fiber optic magnetic field sensor of claim 1, wherein: the number of the noble metal particles is more than 1.
3. The fiber optic magnetic field sensor of claim 2, wherein: the end face of the fiber core is provided with a pit, and the noble metal particles are not arranged in the pit.
4. The fiber optic magnetic field sensor of claim 3, wherein: the width and depth of the pits are smaller than the diameter and radius of the noble metal particles, respectively.
5. The fiber optic magnetic field sensor of claim 4, wherein: the number of pits is more than one.
6. The fiber optic magnetic field sensor of claim 2, wherein: the end surface of the fiber core is concave.
7. The fiber optic magnetic field probe of any one of claims 1-6, wherein: the material of the noble metal particles is gold, silver or platinum.
8. The fiber optic magnetic field sensor of claim 7, wherein: the noble metal particles are spherical in shape.
9. The fiber optic magnetic field sensor of claim 8, wherein: the noble metal particles have a diameter greater than 20 nanometers and less than 100 nanometers.
10. The fiber optic magnetic field sensor of claim 9, wherein: the magnetostrictive layer is made of nickel alloy, iron-based alloy and ferrite material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010758214.0A CN111880126A (en) | 2020-07-31 | 2020-07-31 | Optical fiber magnetic field detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010758214.0A CN111880126A (en) | 2020-07-31 | 2020-07-31 | Optical fiber magnetic field detector |
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| Publication Number | Publication Date |
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| CN111880126A true CN111880126A (en) | 2020-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010758214.0A Withdrawn CN111880126A (en) | 2020-07-31 | 2020-07-31 | Optical fiber magnetic field detector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113219383A (en) * | 2021-05-25 | 2021-08-06 | 韩山师范学院 | Magnetic field measuring device |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113219383A (en) * | 2021-05-25 | 2021-08-06 | 韩山师范学院 | Magnetic field measuring device |
| CN113219383B (en) * | 2021-05-25 | 2022-12-06 | 韩山师范学院 | Magnetic field measuring device |
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Application publication date: 20201103 |