CN111413650B - Composite coating magnetic measurement optical fiber and preparation method thereof - Google Patents
Composite coating magnetic measurement optical fiber and preparation method thereof Download PDFInfo
- Publication number
- CN111413650B CN111413650B CN202010231382.4A CN202010231382A CN111413650B CN 111413650 B CN111413650 B CN 111413650B CN 202010231382 A CN202010231382 A CN 202010231382A CN 111413650 B CN111413650 B CN 111413650B
- Authority
- CN
- China
- Prior art keywords
- coating
- optical fiber
- acrylic resin
- alloy
- indium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/0052—Manufacturing aspects; Manufacturing of single devices, i.e. of semiconductor magnetic sensor chips
-
- 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
-
- 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
- G01R33/10—Plotting field distribution ; Measuring field distribution
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/1238—Measuring superconductive properties
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/18—Measuring magnetostrictive properties
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
The invention relates to a composite coating magneto-optical fiber, which comprises a bare fiber and a coating layer, wherein the coating layer is a composite coating layer consisting of acrylic resin, iron-gallium alloy and indium-bismuth alloy. The preparation method of the composite coating magnetic measurement optical fiber comprises the following steps: 1. coating acrylic resin on the surface of the bare fiber by adopting a dip coating-ultraviolet light curing process to form an acrylic resin coating on the surface of the bare fiber; 2. uniformly mixing iron-gallium alloy powder prepared by a gas atomization method and an indium-bismuth alloy, melting at 80 ℃, and putting into a coating cup; 3. and (3) passing the optical fiber coated with the acrylic resin coating through the coating cup prepared in the step (2), coating the metal alloy melt on the surface of the acrylic resin coating, and then cooling to prepare the composite coating magnetic measuring optical fiber. The invention solves the problems of lower strain of the traditional material and low sensitivity of the optical fiber magnetic field sensor at low temperature, and obviously improves the measurement precision and sensitivity of the magnetic measurement optical fiber at low temperature.
Description
Technical Field
The invention belongs to the technical field of optical fiber magnetic field sensors for superconducting magnets, and particularly relates to a magnetic measurement optical fiber for measuring the magnetic field change of a superconducting magnet at low temperature and a preparation method thereof.
Background
The magnetic field is an important parameter reflecting the operating state of the superconducting magnet in the operation of the superconducting equipment, and the quench fault of the superconducting magnet can be timely found through the real-time monitoring of the magnetic field, so that the normal operation of the superconducting magnet is facilitated. However, the superconducting magnet is in a complex electromagnetic environment with a strong magnetic field and a large current, and although the traditional electric magnetic field sensors (flux gate magnetometers, hall sensors, induction coil magnetometers, giant magneto-impedance magnetic sensors, and the like) have mature application modes in many occasions, due to the influence of the magneto-resistance effect, the conventional electric magnetic field sensors are difficult to apply to the superconducting magnet with the complex electromagnetic environment, and the measurement requirement for monitoring the whole magnetic field of the superconducting magnet in a low-temperature environment is difficult to meet.
The optical fiber sensing technology takes optical fibers as sensing media and light waves as carriers, and can detect changes of external environments (magnetic fields, electric fields, temperature, humidity and the like) by demodulating changes of wavelengths, phases, amplitudes and the like of the light waves in the optical fibers; under the action of an external magnetic field, the length and the volume of the magnetostrictive material can change along the direction of the magnetic field. The magnetostrictive material is used as a coating layer and attached to the optical fiber, when an external magnetic field changes, the distributed optical fiber can generate tensile strain in the axial direction, so that the central wavelength of the optical fiber is shifted, and the magnetic field intensity can be monitored by constructing a functional relation between the central wavelength of the optical fiber and the magnetic field intensity. The optical fiber magnetic field sensor has strong anti-electromagnetic interference capability, is very suitable for monitoring precise instruments such as a superconducting magnet and the like, can realize distributed multiplexing, can effectively overcome the defects of the traditional electrical magnetic field sensing system in the aspects of long-term stability, durability and distribution range, and realizes high-precision, long-distance, distributed and long-term magnetic field environment monitoring.
The optical fiber magnetic field sensor is applied to monitoring of the superconducting magnet at low temperature, and the sensor can not avoid irreversible damage to superconducting equipment caused by quench fault to the maximum extent only by responding in time when the magnetic field of the magnet is abnormal, but the accurate measurement of the magnetic field at low temperature and the monitoring application in the superconducting magnet are not realized at present.
Disclosure of Invention
The invention overcomes the defect that the existing optical fiber magnetic field sensor can only carry out point-mode measurement, and adopts the distributed optical fiber sensor based on magnetostrictive materials to realize the magnetic field sensing demodulation of the whole optical fiber link. Meanwhile, the optical frequency domain reflection method is combined with the low-temperature sensitive magnetostrictive iron gallium alloy (Fe-Ga) coated optical fiber, so that high spatial resolution and high sensitivity monitoring of a weak magnetic field at low temperature is realized.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
the utility model provides a compound coating surveys magnetic fiber, includes bare fiber and coating, the coating is: the inner layer is an acrylic resin coating, and the outer layer is a composite coating of a metal alloy coating; the metal alloy coating is an iron-gallium alloy coating and an indium-bismuth alloy coating.
The bare fiber is a quartz core single-mode fiber only containing a fiber core.
The mass ratio of the iron-gallium alloy to the indium-bismuth alloy is 85-95: 15 to 5.
The mass ratio of iron to gallium in the iron-gallium alloy is 5: 1.
the mass ratio of indium to bismuth in the indium-bismuth alloy is 2: 1.
the preparation method of the composite coating magnetic measurement optical fiber comprises the following steps:
and 3, passing the optical fiber coated with the acrylic resin coating through the coating cup prepared in the step 2, coating the metal alloy melt on the surface of the acrylic resin coating, and then cooling.
And 4, finally, preparing the composite coating magnetism measuring optical fiber with the inner layer of the acrylic resin coating and the outer layer of the metal alloy coating.
In the step 1, the thickness of the acrylic resin coating is 10-200 μm.
In the step 2, the grain sizes of the iron-gallium alloy and the indium-bismuth alloy are 5-80 μm.
In the step 2, the mass ratio of iron to gallium in the iron-gallium alloy is 5: 1, the mass ratio of indium to bismuth in the indium-bismuth alloy is 2: 1.
in step 3, the thickness of the cooled metal alloy coating is 10-200 μm.
The invention has the beneficial effects that:
1. the magnetostrictive material adopted by the invention is the iron-gallium alloy, has the advantages of high strain, small hysteresis, high stress sensitivity and the like under a low magnetic field, and solves the problems of low strain of the traditional material and low sensitivity of the optical fiber magnetic field sensor at a low temperature.
2. The invention adopts a composite coating magnetism-measuring optical fiber with an inner layer of acrylic resin coating and an outer layer of magnetostrictive metal coating. When the external magnetic field changes, the outer magnetostrictive metal coating deforms, and the strain is amplified through the inner high-elasticity acrylic resin coating; and further, the measurement precision and sensitivity of the magnetic measurement optical fiber at low temperature are obviously improved.
3. The optical fiber adopted by the invention is a fully distributed optical fiber, is not limited to the traditional point measurement, can realize the full-line monitoring of the optical fiber through Rayleigh scattering, realizes the overall magnetic field detection of the superconducting magnet, and can timely feed back the magnetic field mutation of the superconducting magnet.
Drawings
The invention has the following drawings:
FIG. 1 is a composite coated magnetic sensing fiber of the present invention;
wherein, 1 is a bare optical fiber, and 2 is a coating layer containing acrylic resin, iron-gallium alloy and indium-bismuth alloy.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the composite coating magnetic measurement fiber of the present invention includes a bare fiber 1 and a coating layer 2, wherein the coating layer 2 is: the inner layer is a composite coating layer of an acrylic resin coating and the outer layer is a metal alloy coating; the metal alloy coating is an iron-gallium alloy coating and an indium-bismuth alloy coating.
The bare fiber is a quartz core single-mode fiber only containing a fiber core.
The mass ratio of the iron-gallium alloy to the indium-bismuth alloy is 85-95: 15 to 5.
The mass ratio of iron to gallium in the iron-gallium alloy is 5: 1.
the mass ratio of indium to bismuth in the indium-bismuth alloy is 2: 1.
the preparation method of the composite coating magnetic measurement optical fiber comprises the following steps:
1. coating acrylic resin on the surface of the bare fiber by adopting a dip coating-ultraviolet light curing process to form an acrylic resin coating with the thickness of 10-200 mu m on the surface of the bare fiber;
2. mixing iron-gallium alloy powder (Fe-Ga, the mass ratio of Fe to Ga is 5: 1) and indium-bismuth alloy powder (In, Bi is 2: 1) with the particle size of 5-80 mu m prepared by a gas atomization method according to the mass ratio of 85-95: 15-5, uniformly mixing, melting at 80 ℃, and putting into a coating cup;
3. and (3) coating the optical fiber coated with the acrylic resin coating with a metal alloy melt on the surface of the acrylic resin coating by using the coating cup containing the molten metal alloy (Fe-Ga and InBi) prepared in the step (2), and cooling to obtain the metal alloy coating with the thickness of 10-200 mu m.
4. Finally, the composite coating magnetism-measuring optical fiber with the inner layer of the acrylic resin coating and the outer layer of the magnetostrictive metal alloy coating is prepared.
Example 1
1. Coating acrylic resin on the surface of the bare fiber by adopting a dip coating-ultraviolet light curing process to form a polymer coating with the thickness of 100 mu m on the surface of the bare fiber;
2. preparing iron-gallium alloy powder (Fe-Ga) with the particle size of 25 mu m and indium-bismuth alloy powder by a gas atomization method according to the mass ratio of 95: 5, uniformly mixing, melting at 80 ℃, and putting into a coating cup;
3. the optical fiber coated with the acrylic resin coating was passed through a coating cup containing molten metal alloys (Fe-Ga and InBi), and a metal melt was coated on the surface of the acrylic resin coating, and the thickness of the metal alloy coating after cooling was 100. mu.m.
Example 2
1. Coating acrylic resin on the surface of the bare fiber by adopting a dip coating-ultraviolet light curing process to form a polymer coating with the thickness of 200 mu m on the surface of the bare fiber;
2. preparing iron-gallium alloy powder (Fe-Ga) with the particle size of 80 mu m and indium-bismuth alloy powder by a gas atomization method according to the mass ratio of 90: 10, uniformly mixing, melting at 80 ℃, and putting into a coating cup;
3. the optical fiber coated with the acrylic resin coating was passed through a coating cup containing molten metal alloys (Fe-Ga and InBi), and a metal melt was coated on the surface of the acrylic resin coating, and the thickness of the metal alloy coating after cooling was 200. mu.m.
Example 3
1. Coating acrylic resin on the surface of the bare fiber by adopting a dip coating-ultraviolet light curing process to form a polymer coating with the thickness of 10 mu m on the surface of the bare fiber;
2. preparing iron-gallium alloy powder (Fe-Ga) with the particle size of 5 mu m and indium-bismuth alloy powder by a gas atomization method according to the mass ratio of 85: 15, uniformly mixing, melting at 80 ℃, and putting into a coating cup;
3. the optical fiber coated with the acrylic resin coating was passed through a coating cup containing molten metal alloys (Fe-Ga and InBi), and a metal melt was coated on the surface of the acrylic resin coating, and the thickness of the metal alloy coating after cooling was 10 μm.
The composite coating magnetism measuring optical fiber prepared by the invention is placed in a liquid nitrogen environment (77K), the change of an external magnetic field is measured by Rayleigh scattering spectrum drift in OFDR, and when the variation of the measured magnetic induction intensity is delta M which is 12mT, the drift of the detected Rayleigh scattering spectrum is 2.5 GHz. In the process that the change of the measured magnetic induction intensity is increased from 0mT to 200mT, the spectrum drift degree of Rayleigh scattering is gradually increased, the rayleigh scattering spectrum drift amount and the magnetic induction intensity have better linear correlation, and the method can realize the measurement of the change of the magnetic field at low temperature. In addition, a plurality of variable magnetic fields are arranged at multiple points along the length direction of the optical fiber, and the spectrum drift amounts at different positions are different, so that the magnetic measurement optical fiber can realize fully-distributed monitoring.
Those not described in detail in this specification are within the skill of the art.
Claims (8)
1. The composite coating magnetic measurement optical fiber is characterized by comprising a bare optical fiber and a coating layer, wherein the coating layer is as follows: the inner layer is an acrylic resin coating, and the outer layer is a composite coating of a metal alloy coating; the metal alloy coating is an iron-gallium alloy coating and an indium-bismuth alloy coating; the mass ratio of the iron-gallium alloy to the indium-bismuth alloy is 85-95: 15 to 5.
2. The composite coated magnetic fiber of claim 1, wherein: the bare fiber is a quartz core single-mode fiber only containing a fiber core.
3. The composite coated magnetic fiber of claim 1, wherein: the mass ratio of iron to gallium in the iron-gallium alloy is 5: 1.
4. the composite coated magnetic fiber of claim 1, wherein: the mass ratio of indium to bismuth in the indium-bismuth alloy is 2: 1.
5. the method for preparing the composite coating magnetic measuring optical fiber according to claim 1, which comprises the following steps:
step 1, coating acrylic resin on the surface of a bare fiber by adopting a dip coating-ultraviolet curing process to form an acrylic resin coating on the surface of the bare fiber;
step 2, mixing the iron-gallium alloy powder and the indium-bismuth alloy powder prepared by a gas atomization method according to a mass ratio of 85-95: 15-5, uniformly mixing, melting at 80 ℃, and putting into a coating cup;
step 3, passing the optical fiber coated with the acrylic resin coating through the coating cup prepared in the step 2, coating a metal alloy melt on the surface of the acrylic resin coating, and then cooling;
step 4, finally, preparing a composite coating magnetism measuring optical fiber with an acrylic resin coating as an inner layer and a metal alloy coating as an outer layer;
in the step 1, the thickness of the acrylic resin coating is 10-200 μm.
6. The method for preparing the composite coating magnetic measuring optical fiber according to claim 5, wherein the method comprises the following steps: in the step 2, the grain sizes of the iron-gallium alloy and the indium-bismuth alloy are 5-80 μm.
7. The method for preparing the composite coating magnetic measuring optical fiber according to claim 5, wherein the method comprises the following steps: in the step 2, the mass ratio of iron to gallium in the iron-gallium alloy is 5: 1, the mass ratio of indium to bismuth in the indium-bismuth alloy is 2: 1.
8. the method for preparing the composite coating magnetic measuring optical fiber according to claim 5, wherein the method comprises the following steps: in step 3, the thickness of the cooled metal alloy coating is 10-200 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010231382.4A CN111413650B (en) | 2020-03-27 | 2020-03-27 | Composite coating magnetic measurement optical fiber and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010231382.4A CN111413650B (en) | 2020-03-27 | 2020-03-27 | Composite coating magnetic measurement optical fiber and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111413650A CN111413650A (en) | 2020-07-14 |
| CN111413650B true CN111413650B (en) | 2021-06-22 |
Family
ID=71489408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010231382.4A Expired - Fee Related CN111413650B (en) | 2020-03-27 | 2020-03-27 | Composite coating magnetic measurement optical fiber and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111413650B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4442350A (en) * | 1981-08-17 | 1984-04-10 | The United States Of America As Represented By The Secretary Of The Navy | Fiber optic sensor with enhanced immunity to random environmental perturbations |
| CN1737602A (en) * | 2005-09-01 | 2006-02-22 | 上海交通大学 | Magnetic deformation optical fiber interference type magnetic sensing probe |
| JP2011069704A (en) * | 2009-09-25 | 2011-04-07 | Technical Research & Development Institute Ministry Of Defence | Optical fiber magnetic sensor |
| CN102435959A (en) * | 2011-10-11 | 2012-05-02 | 电子科技大学 | Magnetic-acoustic surface wave magnetic field sensor and preparation method thereof |
| CN103629090A (en) * | 2013-11-18 | 2014-03-12 | 江苏大学 | Magnetostriction type dual-cavity membrane type micropump |
| CN106932739A (en) * | 2017-05-05 | 2017-07-07 | 中国计量大学 | The micro- hanging bridge magnetic field sensing probe of optical fiber based on F P-structure |
| CN107003192A (en) * | 2014-10-08 | 2017-08-01 | 光学感应器控股有限公司 | Optical fiber cable with tuned cross sensitivity |
| CN108427081A (en) * | 2018-03-14 | 2018-08-21 | 中国科学院半导体研究所 | Magnetosensitive sensing optical cable, production method and distribution type fiber-optic sound sense detection of magnetic field system |
| US10598810B2 (en) * | 2014-05-19 | 2020-03-24 | Halliburton Energy Services, Inc. | Optical magnetic field sensor units for a downhole environment |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4433291A (en) * | 1981-01-09 | 1984-02-21 | The United States Of America As Represented By The Secretary Of The Navy | Optical fiber for magnetostrictive responsive detection of magnetic fields |
| US4687993A (en) * | 1986-01-23 | 1987-08-18 | Geo-Centers, Inc. | Fiber optic magnetic field sensing transducer having a resonant structure |
| US5463312A (en) * | 1994-03-03 | 1995-10-31 | Minnesota Mining And Manufacturing Company | Faraday-effect sensing coil with stable birefringence |
| JPH07275261A (en) * | 1994-04-11 | 1995-10-24 | Morita Mfg Co Ltd | Dental hand piece with built-in lighting system |
| CN101221043A (en) * | 2008-01-30 | 2008-07-16 | 中国科学院力学研究所 | Method for measuring strain by optical fiber grating sensor at low temperature |
| US9182427B2 (en) * | 2009-06-29 | 2015-11-10 | Nec Corporation | Probe for electric/magnetic field |
| CN101598773B (en) * | 2009-07-02 | 2011-09-14 | 西北工业大学 | Magnetic induction intensity sensing head and magnetic induction intensity measurement method and device thereof |
| CN202522744U (en) * | 2012-03-21 | 2012-11-07 | 长飞光纤光缆有限公司 | High temperature and voltage resistant optical cable |
| US9188694B2 (en) * | 2012-11-16 | 2015-11-17 | Halliburton Energy Services, Inc. | Optical interferometric sensors for measuring electromagnetic fields |
| JP2017517494A (en) * | 2014-04-17 | 2017-06-29 | ボストン サイエンティフィック サイムド，インコーポレイテッドＢｏｓｔｏｎ Ｓｃｉｅｎｔｉｆｉｃ Ｓｃｉｍｅｄ，Ｉｎｃ． | Apparatus and method for therapeutic thermal treatment |
| CN108896935B (en) * | 2016-04-08 | 2020-11-13 | 北京信息科技大学 | Method for measuring magnetic field by inducing grating deformation through ultrasonic pulse |
| CN106757001B (en) * | 2016-12-20 | 2019-02-05 | 江苏大学 | The method and apparatus that electromagnetic agitation auxiliary carries out laser melting coating under a kind of pressure cooler environment |
| CN207067442U (en) * | 2017-04-26 | 2018-03-02 | 中天科技光纤有限公司 | A kind of optical fiber |
| CN108957364A (en) * | 2018-07-04 | 2018-12-07 | 兰州大学 | A kind of magnetic field sensor and Measurement Method for Magnetic Field |
| CN109814048A (en) * | 2019-02-01 | 2019-05-28 | 北京交通大学 | For measuring the optical-electronic oscillator and its measurement method in magnetic field |
-
2020
- 2020-03-27 CN CN202010231382.4A patent/CN111413650B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4442350A (en) * | 1981-08-17 | 1984-04-10 | The United States Of America As Represented By The Secretary Of The Navy | Fiber optic sensor with enhanced immunity to random environmental perturbations |
| CN1737602A (en) * | 2005-09-01 | 2006-02-22 | 上海交通大学 | Magnetic deformation optical fiber interference type magnetic sensing probe |
| JP2011069704A (en) * | 2009-09-25 | 2011-04-07 | Technical Research & Development Institute Ministry Of Defence | Optical fiber magnetic sensor |
| CN102435959A (en) * | 2011-10-11 | 2012-05-02 | 电子科技大学 | Magnetic-acoustic surface wave magnetic field sensor and preparation method thereof |
| CN103629090A (en) * | 2013-11-18 | 2014-03-12 | 江苏大学 | Magnetostriction type dual-cavity membrane type micropump |
| US10598810B2 (en) * | 2014-05-19 | 2020-03-24 | Halliburton Energy Services, Inc. | Optical magnetic field sensor units for a downhole environment |
| CN107003192A (en) * | 2014-10-08 | 2017-08-01 | 光学感应器控股有限公司 | Optical fiber cable with tuned cross sensitivity |
| CN106932739A (en) * | 2017-05-05 | 2017-07-07 | 中国计量大学 | The micro- hanging bridge magnetic field sensing probe of optical fiber based on F P-structure |
| CN108427081A (en) * | 2018-03-14 | 2018-08-21 | 中国科学院半导体研究所 | Magnetosensitive sensing optical cable, production method and distribution type fiber-optic sound sense detection of magnetic field system |
Non-Patent Citations (3)
| Title |
|---|
| Magnetic Field sensors employing Fiber Bragg Grating and Magneto-Elastic active material;D. Davino et al;《2006 IEEE International Magnetics Conference (INTERMAG)》;20060512;第1页 * |
| The Frequency Dependence of AC Susceptibility at Variable Length of Bi-2223/Ag Tapes;Yueming Sun et al;《2018 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD)》;20180818;第1-2页 * |
| Vibration and Magnetic Field Sensing Using a Long-Period Grating;Ivo M. Nascimento et al;《IEEE Sensors Journal》;20171215;第17卷(第20期);第1-5页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111413650A (en) | 2020-07-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ripka | Electric current sensors: a review | |
| CN101788594B (en) | Non-contact type superconduction belt material critical current measuring device | |
| CN106018919A (en) | Wide-range broadband current sensor base on tunnel magnetic resistance effect | |
| CN107632060B (en) | Pipeline defect detection device based on optical fiber magnetic field sensing | |
| CN111308155B (en) | Coal mine/subway optical fiber current sensor based on composite material and testing method | |
| Li et al. | An optical fiber-based surface plasmon resonance sensor for simultaneous measurement of temperature and magnetic field intensity | |
| Ramalingam et al. | Fiber Bragg grating sensors for strain measurement at multiple points in an NbTi superconducting sample coil | |
| CN105277798B (en) | A kind of high-temperature superconductor unit A.C.power loss compensating measurement method | |
| CN111413650B (en) | Composite coating magnetic measurement optical fiber and preparation method thereof | |
| CN205844507U (en) | Fluxgate magnetic core structure based on nurse hertz coil suddenly | |
| CN107132406A (en) | A kind of non-contact electric current measurement device based on giant magnetostrictive material | |
| Tanaka et al. | Two-channel HTS SQUID gradiometer system for detection of metallic contaminants in lithium-ion battery | |
| CN105974336B (en) | A kind of detection method of powder core saturation induction density | |
| Luo et al. | Distributed fiber optic sensing to identify locations of resistive transitions in rebco conductors and magnets | |
| CN111289606A (en) | Magnetic force effect stress detection system and method based on existing magnetism of structural steel | |
| CN113740784B (en) | Ferromagnetic resonance vector magnetic field sensor with ultra-wide working range and application | |
| Beckley et al. | Influence of inclusions on domain-wall motion and power loss in oriented electrical steel | |
| CN103499272A (en) | Wide-range magnetic thickness measuring device for non-magnetic coating of ferromagnetic component and detection method of wide-range magnetic thickness measuring device | |
| Ma et al. | Rogowski coil for current measurement in a cryogenic environment | |
| Guan et al. | Experimental measurements of the sensitivity of fiber-optic Bragg grating sensors with a soft polymeric coating under mechanical loading, thermal and magnetic under cryogenic conditions | |
| Tanaka et al. | High Tc SQUID detection system for metallic contaminant in lithium ion battery | |
| CN115707976A (en) | Current sensor with multi-air-gap amorphous magnetic ring | |
| Fan et al. | A Wide Range Current Sensing Device Based on Tunnel Junction Magnetoresistance Sensor for Power Transmission Line Monitoring | |
| Qian et al. | Design of a nonintrusive current sensor with large dynamic range based on tunneling magnetoresistive devices | |
| CN1209623C (en) | Test method of material electromagnetic property change and its special equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210622 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |