CN112596005A - Magnetic fluid-based FP magnetic field sensor and magnetic field testing system - Google Patents
Magnetic fluid-based FP magnetic field sensor and magnetic field testing system Download PDFInfo
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- CN112596005A CN112596005A CN202011292212.3A CN202011292212A CN112596005A CN 112596005 A CN112596005 A CN 112596005A CN 202011292212 A CN202011292212 A CN 202011292212A CN 112596005 A CN112596005 A CN 112596005A
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- 239000011553 magnetic fluid Substances 0.000 title claims abstract description 31
- 238000012360 testing method Methods 0.000 title claims abstract description 11
- 239000013307 optical fiber Substances 0.000 claims abstract description 38
- 239000000919 ceramic Substances 0.000 claims abstract description 29
- 239000000835 fiber Substances 0.000 claims description 15
- 239000003292 glue Substances 0.000 claims description 4
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 10
- 238000002310 reflectometry Methods 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000005355 Hall effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002122 magnetic nanoparticle Substances 0.000 description 1
- 238000001646 magnetic resonance method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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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
Abstract
The invention discloses a magnetic fluid-based FP magnetic field sensor and a magnetic field testing system, wherein the FP magnetic field sensor comprises a ceramic head, a single-mode optical fiber, a magnetic fluid and a reflecting film, the ceramic head is provided with a groove, one end of the single-mode optical fiber is fixed in the groove and forms a closed cavity with the groove, the magnetic fluid is filled in the cavity and is in contact with the end surface of the single-mode optical fiber, and the reflecting film is arranged in the cavity and is opposite to the end surface of the single-mode optical fiber in the cavity. The FP magnetic field sensor based on the magnetic fluid and the magnetic field test system provided by the invention have the advantages of high measurement precision, electromagnetic interference resistance, chemical corrosion resistance, small size and wide application field.
Description
Technical Field
The invention relates to the field of magnetic field sensor testing, in particular to a magnetic fluid-based FP magnetic field sensor and a magnetic field testing system.
Background
The conventional magnetic field measuring methods generally include an induction coil method, a flux gate method, a hall effect method, a magnetoresistance effect method, a magnetic resonance method, and the like. These methods have problems in that they are highly susceptible to environmental influences such as electromagnetic interference, and thus it is difficult to perform measurements with high accuracy and high reliability.
The optical fiber sensor has the advantages which are not possessed by a plurality of electric sensors, including electromagnetic interference resistance, high precision, high temperature and high pressure resistance, chemical corrosion resistance and the like, and is suitable for long-term use in severe environments. The FP sensor is one of optical fiber sensors, has all the advantages, but has low magneto-optical coefficient and is insensitive to a magnetic field, and the FP sensor needs to be sensitized to realize the measurement of the magnetic field.
The magnetic fluid is a colloidal solution composed of magnetic nano particles, and has a magneto-induced controllable refractive index effect, namely, when a magnetic field changes, the refractive index of the magnetic fluid changes, so that the magnetic fluid and the FP sensor are organically combined, and the high-precision measurement of the magnetic field can be realized.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an FP magnetic field sensor based on magnetic fluid and a magnetic field test system, and the technical scheme is as follows:
in one aspect, the invention provides a magnetic fluid-based FP magnetic field sensor, which comprises
The ceramic head is provided with a groove;
one end of the single-mode optical fiber is fixed in the groove and forms a closed cavity together with the groove;
the magnetic fluid is filled in the cavity and is in contact with the end face of the single-mode optical fiber;
and the reflecting film is arranged in the cavity and is opposite to the end face of the single-mode optical fiber in the cavity.
Further, the ceramic head is a cylinder with a diameter ranging from 2.8 to 3.2mm and a length ranging from 14 to 16 mm.
Further, the groove is a cylinder with a diameter ranging from 0.23 to 0.27mm and a length ranging from 9 to 11 mm.
Further, the groove is arranged in the center of the end face of the ceramic head.
Further, the reflectance of the reflective film is not less than 99%.
Further, the reflecting film is plated at the bottom of the groove.
Further, the single-mode optical fiber is sealed on the groove through ultraviolet curing glue.
Further, the single mode fiber is a commercial single mode fiber.
Further, the cavity length of the cavity is 0.03-0.05 mm.
In another aspect, the present invention provides a magnetic field testing system, which includes a broadband light source, a spectrometer and the FP magnetic field sensor, wherein a single-mode optical fiber of the FP magnetic field sensor is connected to the broadband light source and the spectrometer through an optical fiber coupler.
The technical scheme provided by the invention has the following beneficial effects:
a. the single-mode optical fiber and the ceramic head form an FP interference structure, so that the measurement precision is high;
b. the material has the characteristics of electromagnetic interference resistance and chemical corrosion resistance, and can be applied to the fields of electric power, oil gas detection and the like;
c. the sensor is small in size, can be applied to a narrow range, and is wide in application field;
d. simple structure, low cost and simple manufacturing process.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a magnetic fluid-based FP magnetic field sensor provided by an embodiment of the invention;
wherein the reference numerals are respectively: 1-single mode fiber, 2-curing glue, 3-ceramic head, 4-reflecting film, 5-magnetofluid.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.
In one embodiment of the present invention, there is provided a magnetic fluid-based FP magnetic field sensor, see fig. 1, comprising a ceramic head 3, a single-mode optical fiber 1, a magnetic fluid 5 and a reflective film 4,
the ceramic head 3 is provided with a groove, specifically, the ceramic head 3 is a sensor ceramic head, the ceramic head 3 is a cylinder, the diameter range of the cylinder is 2.8-3.2mm, preferably 3mm, the length range of the cylinder is 14-16mm, preferably 15mm, the groove is a cylinder, the diameter range of the cylinder is 0.23-0.27mm, preferably 0.25mm, the length range of the cylinder is 9-11mm, preferably 10mm, and the groove is arranged in the center of the end face of the ceramic head 3, namely the groove and the ceramic head are the same central shaft;
one end of the single-mode fiber 1 is fixed in the groove and forms a closed cavity with the groove, specifically, the single-mode fiber 1 is sealed on the groove through an ultraviolet curing adhesive 2, the single-mode fiber 1 is a commercial single-mode fiber 1, the cavity is also approximately a cylinder, and the cavity length of the cavity is 0.03-0.05 mm;
the magnetic fluid 5 is filled in the cavity and is in contact with the end face of the single-mode optical fiber 1;
reflective film 4 sets up in the cavity, and with in the cavity the terminal surface of single mode fiber 1 sets up relatively, specifically, reflective film 4's reflectivity is not less than 99%, reflective film 4 plates the bottom of recess, towards the recess opening.
In an embodiment of the present invention, the FP magnetic field sensor is formed by connecting a single-mode fiber 1 and a ceramic head 3, in this embodiment, a layer of high reflection film 4 is plated at the bottom of a groove on the ceramic head 3, the reflectivity of the high reflection film is 99%, an FP cavity, i.e., the above-mentioned cavity, is formed between an end face of the single-mode fiber 1 and the reflection film 4, and a magnetic fluid 5 is injected in the FP cavity. When the external magnetic field changes, the refractive index of the magnetic fluid 5 changes, namely the refractive index in the cavity changes, and the drift amount of the resonance peak of the reflection spectrum is finally influenced, and the size of the magnetic field can be indirectly measured through the drift amount according to the relationship between the refractive index in the cavity and the drift amount of the resonance peak and the relationship between the magnetic field and the refractive index of the magnetic fluid 5.
Specifically, the single-mode optical fiber 1 is connected with the ceramic head 3, the end face of the single-mode optical fiber 1 is in contact with the liquid level of the magnetic fluid 5, the ultraviolet curing adhesive 2 is used for sealing, and after connection, an FP cavity, namely the cavity, is formed between the end face of the single-mode optical fiber 1 and the reflecting film 4, and the cavity length of the cavity is 0.03-0.05 mm. An FP cavity formed between the end face of the single-mode optical fiber 1 and the reflecting film 4 forms an FP interferometer structure, meanwhile, the magnetic fluid 5 is injected into the FP interferometer structure, according to the magneto-controllable refractive index principle of the magnetic fluid 5, when the external magnetic field where the sensor is located changes, the refractive index of the magnetic fluid 5 can be changed, namely the refractive index in the FP cavity is changed, and the position of a resonance peak of a reflection spectrum can be changed through the refractive index in the FP cavity, so that the size of the magnetic field can be measured through measuring the drift amount of the resonance peak.
In one embodiment of the invention, the FP magnetic field sensor can be manufactured by designing a cylindrical hollow ceramic head with an inner diameter of 0.25mm, an inner depth of 10mm, an outer diameter of 3mm and a length of 15 mm; the bottom surface in the ceramic head is plated with a layer of high-reflectivity reflection film, the reflectivity of the reflection film is 99%, so that the light emitted from the single-mode optical fiber can be reflected back; injecting magnetic fluid into the ceramic head by using an injector to ensure that the injection depth is 0.03-0.05 mm; inserting the single-mode optical fiber into the ceramic head to enable the end face of the single-mode optical fiber to be in contact with the liquid level of the magnetic fluid; and sealing by using ultraviolet curing glue, so that the single-mode optical fiber is fixedly sealed on the ceramic head.
In one embodiment of the invention, a magnetic field test system is provided, which comprises a broadband light source, a spectrometer and the FP magnetic field sensor, wherein a single-mode optical fiber 1 of the FP magnetic field sensor is connected with the broadband light source and the spectrometer through an optical fiber coupler.
Specifically, when the optical fiber spectrometer is used, the other end of the single-mode optical fiber 1 can be connected with the 3dB optical fiber coupler and connected to the broadband light source and the spectrometer through the optical fiber coupler, light is emitted from the broadband light source, enters the FP magnetic field sensor through the optical fiber coupler, is reflected back to the optical fiber coupler through the FP magnetic field sensor, and finally, an optical signal is input into the spectrometer, and the change condition of the magnetic field is analyzed through the spectrum. When the magnetic field changes, the refractive index of the magnetic fluid changes, namely the refractive index in the FP cavity changes, and then the reflection spectrum shifts, and the size of the magnetic field can be indirectly measured by establishing the relationship between the refractive index in the cavity and the shift amount of the resonance peak of the reflection spectrum and the relationship between the magnetic field and the refractive index of the magnetic fluid.
According to the magnetic fluid-based FP magnetic field sensor and the magnetic field testing system, the single-mode optical fiber and the ceramic head form the FP interference structure, so that the measuring precision is high, the ceramic head is simple in structure, a layer of high-reflectivity reflecting film is plated in the ceramic head, and the optical fiber is the common single-mode optical fiber, so that the magnetic field sensor has the characteristics of low cost and simple manufacturing process.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A FP magnetic field sensor based on magnetic fluid is characterized by comprising
The ceramic head (3), the said ceramic head (3) has grooves;
one end of the single-mode optical fiber (1) is fixed in the groove, and the single-mode optical fiber and the groove form a closed cavity;
the magnetic fluid (5) is filled in the cavity and is in contact with the end face of the single-mode optical fiber (1);
and the reflecting film (4) is arranged in the cavity, and is opposite to the end face of the single-mode optical fiber (1) in the cavity.
2. The FP magnetic field sensor according to claim 1, characterized in that the ceramic head (3) is a cylinder with a diameter in the range of 2.8-3.2mm and a length in the range of 14-16 mm.
3. The FP magnetic field sensor of claim 2, wherein the grooves are cylindrical with a diameter in the range of 0.23-0.27mm and a length in the range of 9-11 mm.
4. The FP magnetic field sensor according to claim 3, characterised in that the recess is arranged centrally in the end face of the ceramic head (3).
5. The FP magnetic field sensor according to claim 1, characterized in that the reflectance of the reflective film (4) is not less than 99%.
6. The FP magnetic field sensor according to claim 1, wherein the reflective film (4) is plated at the bottom of the groove.
7. The FP magnetic field sensor according to claim 1, characterised in that the single mode fibre (1) is sealed on the groove by means of an ultra-violet cured glue (2).
8. The FP magnetic field sensor according to claim 1, characterized in that the single-mode fiber (1) is a commercial single-mode fiber (1).
9. The FP magnetic field sensor of claim 1, wherein the cavity has a cavity length of 0.03-0.05 mm.
10. A magnetic field test system comprising a broadband light source, a spectrometer and a FP magnetic field sensor according to any of claims 1-9, the single mode fiber (1) of the FP magnetic field sensor being connected to the broadband light source and the spectrometer by a fiber coupler.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011292212.3A CN112596005A (en) | 2020-11-18 | 2020-11-18 | Magnetic fluid-based FP magnetic field sensor and magnetic field testing system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011292212.3A CN112596005A (en) | 2020-11-18 | 2020-11-18 | Magnetic fluid-based FP magnetic field sensor and magnetic field testing system |
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| CN112596005A true CN112596005A (en) | 2021-04-02 |
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| CN202011292212.3A Pending CN112596005A (en) | 2020-11-18 | 2020-11-18 | Magnetic fluid-based FP magnetic field sensor and magnetic field testing system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101281237A (en) * | 2008-05-15 | 2008-10-08 | 上海交通大学 | Apparatus based on magnetofluid refraction index changing and detecting magnetic variation |
| CN102221679A (en) * | 2011-04-25 | 2011-10-19 | 东北大学 | Magnetofluid filling photonic crystal optical fiber F-P magnetic field sensor |
| WO2017030999A1 (en) * | 2015-08-14 | 2017-02-23 | Illumina, Inc. | Systems and methods using magnetically-responsive sensors for determining a genetic characteristic |
| CN109709498A (en) * | 2019-01-09 | 2019-05-03 | 西北大学 | A kind of all -fiber magnetic field vector sensor and preparation method thereof of magnetic fluid cladding |
| CN210427777U (en) * | 2019-04-22 | 2020-04-28 | 中国计量大学 | Magnetic fluid and magnetostrictive sleeve double-magnetic-sensitive optical fiber magnetic field sensing probe |
| CN111443313A (en) * | 2020-04-26 | 2020-07-24 | 浙江大学 | F-P magnetic field sensor printed by 3D technology of two-photon femtosecond laser direct writing and manufacturing method thereof |
| CN211234773U (en) * | 2019-12-23 | 2020-08-11 | 苏州德睿电力科技有限公司 | FP chamber temperature sensor based on optic fibre wire jumper |
-
2020
- 2020-11-18 CN CN202011292212.3A patent/CN112596005A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101281237A (en) * | 2008-05-15 | 2008-10-08 | 上海交通大学 | Apparatus based on magnetofluid refraction index changing and detecting magnetic variation |
| CN102221679A (en) * | 2011-04-25 | 2011-10-19 | 东北大学 | Magnetofluid filling photonic crystal optical fiber F-P magnetic field sensor |
| WO2017030999A1 (en) * | 2015-08-14 | 2017-02-23 | Illumina, Inc. | Systems and methods using magnetically-responsive sensors for determining a genetic characteristic |
| CN109709498A (en) * | 2019-01-09 | 2019-05-03 | 西北大学 | A kind of all -fiber magnetic field vector sensor and preparation method thereof of magnetic fluid cladding |
| CN210427777U (en) * | 2019-04-22 | 2020-04-28 | 中国计量大学 | Magnetic fluid and magnetostrictive sleeve double-magnetic-sensitive optical fiber magnetic field sensing probe |
| CN211234773U (en) * | 2019-12-23 | 2020-08-11 | 苏州德睿电力科技有限公司 | FP chamber temperature sensor based on optic fibre wire jumper |
| CN111443313A (en) * | 2020-04-26 | 2020-07-24 | 浙江大学 | F-P magnetic field sensor printed by 3D technology of two-photon femtosecond laser direct writing and manufacturing method thereof |
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