CN115615347B - Superconducting coil strain monitoring device based on distributed optical fiber - Google Patents
Superconducting coil strain monitoring device based on distributed optical fiber Download PDFInfo
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- CN115615347B CN115615347B CN202211637926.2A CN202211637926A CN115615347B CN 115615347 B CN115615347 B CN 115615347B CN 202211637926 A CN202211637926 A CN 202211637926A CN 115615347 B CN115615347 B CN 115615347B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a superconducting coil strain monitoring device based on distributed optical fibers. The invention realizes the continuous monitoring function of the electromagnetic strain of the superconducting coil by using the mode that the distributed monitoring optical fiber is buried in the upper and lower edge surfaces of the superconducting coil; the problems of few monitoring sites and narrow monitoring area of the traditional strain gauge monitoring scheme are solved; the line consumption of the distributed optical fiber is greatly reduced, the refreshing speed of strain monitoring is improved, and the overall strain condition monitoring for a large superconducting magnet is facilitated. The invention uses the curing agent to package the distributed monitoring optical fiber and is tightly attached to the superconducting tape, and can simultaneously play a certain edge fixing effect on the tape, reduce the electromagnetic stress level of the tape to a certain extent and improve the operation stability of the superconducting coil.
Description
Technical Field
The invention relates to the technical field of superconducting coil strain monitoring, in particular to a superconducting coil strain monitoring device based on distributed optical fibers.
Background
The superconducting coil wound by the REBCO high-temperature superconducting tape has the outstanding advantages of high current-carrying density and high magnetic field strength. The superconducting coil is generally in a cake-shaped structure, the REBCO strip is wound into a single cake or double cakes in a planar spiral structure, and a plurality of superconducting wire cakes are stacked to form the superconducting magnet. The cake type stacking structure can effectively improve the space utilization rate of the magnet, improve the magnetic field coefficient and achieve higher central field intensity.
The superconducting coil has wide application in the fields of advanced electric equipment, high-end medical equipment, large scientific devices and the like, particularly in the extremely high field magnet technology, the superconducting coil has outstanding performance advantages and has certain irreplaceability when impacting a central magnetic field above 40T. Because the through-flow density and the background magnetic field of the superconducting strip in the extremely high field magnet are large, the strip is subjected to large electromagnetic stress, and the strain level can even reach the critical level that the strip can keep the superconducting performance. In order to monitor the working state of the superconducting coil under the extremely high back field in real time, a strain monitoring device for the superconducting coil needs to be designed.
The superconducting coil has a very compact structure, and one of the existing strain monitoring modes is to arrange a strain gauge outside the superconducting coil, wherein the pasting direction of the strain gauge is the stretching direction of a strip; still another approach is to monitor the strain level throughout the ribbon by winding distributed fibers around turns of the REBCO ribbon, or by embedding fibers in the ribbon. However, if a strain gauge monitoring mode is adopted, since the pie-shaped close-wound space is very compact, the strain gauge is difficult to arrange inside the coil, and the actual strain condition of the coil is difficult to reflect only by monitoring the external strain; if the mode of winding and winding the distributed optical fiber between turns is adopted, the wire consumption of the optical fiber is too large, the data processing difficulty of the monitoring system is large, the refreshing speed of a strain result is slow, and the real-time monitoring is difficult to realize in a large superconducting magnet.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the embodiment of the invention provides a superconducting coil strain monitoring device based on a distributed optical fiber.
The invention provides a superconducting coil strain monitoring device based on a distributed optical fiber, which comprises:
the strain signal acquisition system comprises a distributed monitoring optical fiber, the distributed monitoring optical fiber is fixedly arranged on the upper edge face and the lower edge face of the superconducting coil through a curing agent, the distributed monitoring optical fiber is embedded in the curing agent and is arranged in a manner of being tightly attached to a belt material of the superconducting coil, and the number of turns of the distributed monitoring optical fiber is smaller than that of the turns of the superconducting coil;
the signal processing device is arranged at the downstream of the strain signal acquisition system, a strip of the superconducting coil is influenced by electromagnetic force to generate tensile strain so that the curing agent generates strain, the strain signal acquisition system measures the strain generated by the curing agent by using the distributed monitoring optical fiber to acquire a strain signal, and the signal processing device processes the strain signal to obtain the strain of the superconducting coil.
In some embodiments, the superconducting coil is a double-pancake winding structure having an upper pancake and a lower pancake, a tape of the superconducting coil is wound on an inner skeleton, and an insulating sheet is arranged between the upper pancake and the lower pancake.
In some embodiments, the distributed monitoring fiber is divided into two sections in the superconducting coil, and the two sections are respectively arranged on the upper edge surface and the lower edge surface of the superconducting coil, the outer leading-out section of the distributed monitoring fiber is led out in parallel along the edge surfaces, and the inner leading-out section of the distributed monitoring fiber is led out from the upper surface of the curing agent.
In some embodiments, the outer lead-out sections of the distributed monitoring fibers are connected at the outermost turns of the coil in a single superconducting coil; in the superconducting magnet formed by a plurality of superconducting coils, the outer leading-out sections of the distributed monitoring optical fibers are sequentially connected at the outermost turns of the coils, and the inner leading-out sections of the distributed monitoring optical fibers of the adjacent superconducting coils are connected at the gap between the curing agent and the inner skeleton, so that a strain monitoring optical fiber penetrating through all the superconducting coils is formed.
In some embodiments, the arrangement of the distributed monitoring fibers at the upper and lower edge faces of the superconducting coil is one of a spiral, a petal shape, or a star shape.
In some embodiments, the distributed monitoring fiber is one of a rayleigh scattering fiber, a raman scattering fiber, or a brillouin scattering fiber.
In some embodiments, the distributed monitoring fiber has an outer diameter of less than 200 μm.
In some embodiments, the curing agent has a room temperature thermal conductivity of 1.28W/(m K) or greater, and the curing agent has a coefficient of thermal expansion of 30-50ppm/° C.
In some embodiments, the strain signal acquiring system further includes a source light source, a first optical fiber coupler, a second optical fiber coupler, and a photodetector, two ends of the inner lead-out section of the distributed monitoring optical fiber are respectively connected to the first optical fiber coupler and the second optical fiber coupler, the photodetector is disposed downstream of the second optical fiber coupler, and the photodetector performs spectrum analysis on signal light emitted by the second optical fiber coupler.
In some embodiments, the strain signal acquisition system further comprises a strain signal scaling system disposed downstream of the photodetector for modifying the strain signal.
Compared with the prior art, the invention has the beneficial effects that:
the invention realizes the continuous monitoring function of the electromagnetic strain of the superconducting coil by using the mode that the distributed monitoring optical fiber is buried in the upper and lower edge surfaces of the superconducting coil; the problems of few monitoring sites and narrow monitoring area of the traditional strain gauge monitoring scheme are solved; the line consumption of the distributed optical fiber is greatly reduced, the refreshing speed of strain monitoring is improved, and the overall strain condition monitoring for a large superconducting magnet is facilitated.
According to the strain monitoring device provided by the invention, the distributed monitoring optical fibers are embedded in the curing agents on the two sides of the coil, the overall structure is stable, the mechanical strength is good, the coil and the strain monitoring device are tightly combined, the space utilization rate is high, and the stacking is convenient.
The invention uses the curing agent to package the distributed monitoring optical fiber and tightly adheres to the superconducting tape, can simultaneously play a certain edge fixing effect on the tape, reduces the electromagnetic stress level of the tape to a certain extent, and improves the operation stability of the superconducting coil.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a cross-sectional view of a three-dimensional structure of a strain monitoring device according to the present invention;
FIG. 2 is a schematic view of a distributed monitoring fiber in the strain monitoring device according to the present invention;
FIG. 3 is a schematic view of a strain monitoring process according to the present invention;
description of reference numerals:
the device comprises an inner framework 1, a curing agent 2, a distributed monitoring optical fiber 3, a belt material 4, an insulating sheet 5, an inner leading-out section 6, an outer leading-out section 7, a source light source 8, a first optical fiber coupler 9, a second optical fiber coupler 10, a photoelectric detector 11 and a strain signal conversion system 12.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a distributed optical fiber-based superconducting coil strain monitoring apparatus according to an embodiment of the present invention with reference to the accompanying drawings.
As shown in fig. 1-3, the superconducting coil strain monitoring device based on distributed optical fiber according to the present invention includes a strain signal acquisition system and a signal processing device, wherein the signal processing device is disposed downstream of the strain signal acquisition system.
The strain signal acquisition system comprises a source light source 8, a first optical fiber coupler 9, a distributed monitoring optical fiber 3, a second optical fiber coupler 10, a photoelectric detector 11 and a strain signal conversion system 12.
The distributed monitoring optical fiber 3 is fixedly arranged on the upper edge face and the lower edge face of the superconducting coil through the curing agent 2, the distributed monitoring optical fiber 3 is embedded in the curing agent 2 and is arranged to be close to the belt material 4 of the superconducting coil, and the number of turns of the distributed monitoring optical fiber 3 is smaller than that of the superconducting coil.
Specifically, the superconducting coil is a double-pancake coil structure wound by REBCO superconducting tapes, the superconducting coil is provided with an upper edge surface and a lower edge surface, the distributed monitoring optical fibers 3 are placed on the upper edge surface and the lower edge surface of the superconducting coil by using the curing agent 2, the distributed monitoring optical fibers 3 are buried in the curing agent 2, and the distributed monitoring optical fibers 3 are tightly attached to the edges of the tapes 4. In actual measurement, the strip 4 of the superconducting coil is influenced by electromagnetic force to generate tensile strain, the curing agent 2 and the strip 4 are in good contact state as a whole due to the fact that the curing agent 2 and the surface of the strip 4 are in good contact state, and the distributed monitoring optical fiber 3 obtains a strain signal by measuring the strain condition of the curing agent 2 coated outside the distributed monitoring optical fiber. In addition, since the distributed monitoring fiber 3 is disposed at the edge face of the superconducting coil, the winding number of the fiber does not have to be the same as the number of turns of the tape 4, and preferably, the number of turns of the distributed monitoring fiber 3 is smaller than that of the superconducting coil to reduce the amount of the distributed monitoring fiber 3.
In some embodiments, the number of windings of the distributed monitoring fiber 3 is one fifth of the number of windings of the ribbon 4, thereby greatly reducing the amount of fiber used. Because the winding turns of the distributed monitoring optical fiber 3 are few, the winding direction is not completely parallel to the strip 4, and a certain included angle is formed between the strain measurement direction and the stretching direction of the strip 4, the strain signal conversion system 12 is required to convert and correct the strain signal in the strain signal acquisition system to obtain the actual strain signal of the strip 4.
The curing agent 2 has a room temperature thermal conductivity of 1.28W/(mK) or more, and the curing agent 2 has a thermal expansion coefficient of 30-50 ppm/DEG C. The curing agent 2 needs to be selected from materials with good curing strength and strong low-temperature performance, in some embodiments, the curing agent 2 is an epoxy resin curing agent, the epoxy resin curing agent selects Stycast 2850FT curing agent, the low-temperature thermal conductivity of the curing agent can reach 1.28W/(m.K), carbon elements exist in the curing agent components, the thermal expansion coefficient is 30-50 ppm/DEG C, and is close to that of copper, meanwhile, the curing agent has good adhesion to the metal surface and can be tightly attached to the strip 4, so that good conduction of electromagnetic strain of the strip 4 can be realized, edge curing of the whole coil can be performed to a certain degree, the electromagnetic stress level of the coil is reduced, and the strip 4 is protected. Carry out solidification design through customization mould, distributed monitoring optical fiber 3 landfill is gone into behind the curing agent 2, hugs closely overall structure at superconducting coil's edge face again, and concrete flow is: firstly, mixing a colloid component of Stycast 2850FT and a curing liquid and filling the mixture into a cake-shaped mould with the same shape as the upper surface of the superconducting coil; after curing, the distributed monitoring optical fiber 3 is coiled into a spiral shape and is placed on the surface of a curing agent; then, mixing a curing agent colloid component with a curing liquid, coating a layer on the surface of the distributed monitoring optical fiber 3, and just burying the distributed monitoring optical fiber 3 into the colloid; covering the whole body on the surface of the superconducting coil before the curing agent is completely solidified, and waiting for the curing agent to be completely solidified; finally, the mould is disassembled.
The arrangement form of the distributed monitoring optical fiber 3 at the edge face of the superconducting coil is not limited to a spiral structure, and the spiral structure is mainly used for improving the monitoring range of strain and simplifying the processing process of strain data. In a large magnet, the wire consumption of the optical fiber can be further reduced by using a petal-shaped, star-shaped or spiral structure with fewer turns, but the conversion method of strain data needs to be optimized, and the accuracy of strain monitoring is improved.
The superconducting coil is of a double-cake winding structure with an upper cake and a lower cake, a belt material 4 of the superconducting coil is wound on the inner framework 1, and an insulating sheet 5 is arranged between the upper cake and the lower cake.
Specifically, in some embodiments, the superconducting coil is a double-pancake winding structure, and the REBCO tape is wound on the inner frame 1, and the upper and lower pancake are separated by the insulating sheet 5. In actual through-flow operation, the electromagnetic strain of the strip 4 reaches a maximum at the width edges due to the shielding current effect of REBCO strip. The maximum electromagnetic strain level of the superconducting coil can be monitored by arranging the distributed monitoring optical fiber 3 at the edge of the coil, and the actual through-flow working state of the strip 4 can be effectively monitored. In some embodiments, the inner frame 1 is made of stainless steel and the insulating sheet 5 is made of glass fiber reinforced plastic.
The distributed monitoring optical fiber 3 is divided into two sections in the superconducting coil and respectively arranged on the upper edge surface and the lower edge surface of the superconducting coil, the outer leading-out section 7 of the distributed monitoring optical fiber 3 is led out in parallel along the edge surfaces, and the inner leading-out section 6 of the distributed monitoring optical fiber 3 is led out from the upper surface of the curing agent 2.
Specifically, referring to fig. 2, the distributed monitoring fiber 3 is a single-layer helical structure and is integrally attached to the edge surface of the strip 4, the distributed monitoring fiber 3 is divided into two sections in the superconducting coil, the two sections of the distributed monitoring fiber 3 are respectively disposed on the upper and lower edge surfaces of the superconducting coil, the outer leading-out section 7 of the distributed monitoring fiber 3 is led out in parallel along the edge surface, and the inner leading-out section 6 of the distributed monitoring fiber 3 is led out from the upper surface of the curing agent 2, that is, a turn is led out upwards from the innermost helix of the curing agent 2.
In a single superconducting coil, the outer leading-out section 7 of the distributed monitoring optical fiber 3 is connected with the outermost turn of the coil; in a superconducting magnet formed by a plurality of superconducting coils, the outer leading-out sections 7 of the distributed monitoring optical fibers 3 are sequentially connected at the outermost turns of the coils, and the inner leading-out sections 6 of the distributed monitoring optical fibers 3 of the adjacent superconducting coils are connected at the gap between the curing agent 2 and the inner skeleton 1 so as to form a strain monitoring optical fiber penetrating through all the superconducting coils.
Specifically, in the strain monitoring device of a single superconducting coil, the outer leading-out sections 7 of the distributed monitoring optical fibers 3 positioned on the edge faces of the upper and lower coils are connected on the outermost turn of the coil, and the inner leading-out sections 6 are respectively connected with a first optical fiber coupler 9 and a second optical fiber coupler 10. In the superconducting magnet strain monitoring formed by stacking a plurality of superconducting coils, the outer leading-out sections 7 of the distributed monitoring optical fibers 3 on the edge surfaces are sequentially connected at the outermost turns of the coils, the inner leading-out sections 6 of the distributed monitoring optical fibers 3 on the edge surfaces of the adjacent superconducting coils are connected at the gap between the curing agent 2 and the inner framework 1, so that a strain monitoring optical fiber penetrating through all the superconducting coils is formed, and the two ends of the strain monitoring optical fiber are respectively connected with a first optical fiber coupler 9 and a second optical fiber coupler 10.
The photoelectric detector 11 is arranged at the downstream of the second optical fiber coupler 10, the photoelectric detector 11 performs spectrum analysis on the signal light emitted by the second optical fiber coupler 10, and the strain signal conversion system 12 is arranged at the downstream of the photoelectric detector 11 and is used for correcting the strain signal. Specifically, referring to fig. 3, in some embodiments, the source light source 8 continuously emits a light signal by using a linear frequency sweep technique, a beam of the light signal is split by the first fiber coupler 9 and enters the distributed monitoring fiber 3, and the rayleigh scattered light reflected by the distributed monitoring fiber 3 is coupled with the original reference light by the first fiber coupler 9 and is subjected to spectrum analysis in the photodetector 11. Because an included angle exists between the actual arrangement direction of the distributed monitoring optical fiber 3 and the stretching direction of the strip 4, the strain signal conversion system 12 is required to be used for processing, and finally, the actual strain signal of the strip 4 is obtained. In some embodiments, if the number of turns of distributed monitoring fiber 3 is one-fifth of the number of turns of ribbon 4 and the pitch of the turns is consistent, the angle θ between the direction of strain monitored by distributed monitoring fiber 3 and the actual direction of tension of ribbon 4 is fixed, and since ribbon 4 can be considered approximately as an extremely thin material, the tensile strain of ribbon 4 can be expressed as the ratio of the measured fiber strain to cos θ.
In some embodiments, the distributed monitoring fiber 3 is a rayleigh scattering fiber, and the reflection spectrum of the fiber can be analyzed based on the rayleigh scattering principle to obtain the strain change condition of each position of the fiber. In order to realize strain monitoring in a compact space, the outer diameter of the distributed monitoring fiber 3 is not more than 200 μm, and the length level is substantially equivalent to that of a common REBCO superconducting tape. The strain monitoring principle of the distributed monitoring optical fiber 3 is not limited to rayleigh scattering, and distributed optical fibers of the principles of raman scattering, brillouin scattering and the like can be used under the condition of ensuring the external diameter requirement and strain monitoring accuracy of the optical fiber. The position resolution of the strain signal can be effectively improved by using the distributed monitoring optical fiber 3, and meanwhile, compared with a grating optical fiber, the distributed monitoring optical fiber 3 is more compact in structure and more suitable for continuous strain measurement of large-scale coils.
The signal processing device is arranged at the downstream of the strain signal acquisition system, the strip 4 of the superconducting coil is influenced by electromagnetic force to generate tensile strain so that the curing agent 2 generates strain, the strain signal acquisition system measures the strain generated by the curing agent 2 by using the distributed monitoring optical fiber 3 to acquire a strain signal, and the signal processing device processes the strain signal to acquire the strain of the superconducting coil.
Specifically, the distributed monitoring optical fiber 3 is embedded in the curing agent 2 and is arranged close to the strip 4 of the superconducting coil, the strip 4 of the superconducting coil is influenced by electromagnetic force to generate tensile strain, the curing agent 2 and the strip 4 are in good contact with each other on the surface, the curing agent 2 and the strip 4 are subjected to strain as a whole, the distributed monitoring optical fiber 3 of the strain signal acquisition system measures the strain generated by the curing agent 2 coated outside the distributed monitoring optical fiber 3 to acquire a strain signal, and the signal processing device processes the strain signal to acquire the strain condition of the superconducting coil.
The superconducting coil strain monitoring device can realize optical fiber arrangement and strain monitoring at the upper and lower edge surfaces of the superconducting coil, and realize full-area measurement of the strain conditions of the inner and outer turns of the superconducting coil through the continuous measurement characteristic of the distributed monitoring optical fiber 3. Meanwhile, the number of turns of the optical fiber is reduced, the wire consumption of the optical fiber is reduced, the data processing speed of the strain monitoring system is effectively improved, and the strain monitoring system has outstanding performance advantages particularly in the strain monitoring of large superconducting magnets.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms may be directed to different embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A superconducting coil strain monitoring device based on distributed optical fibers is characterized by comprising:
the strain signal acquisition system comprises a distributed monitoring optical fiber, wherein the distributed monitoring optical fiber is fixedly arranged on the upper edge surface and the lower edge surface of the superconducting coil through a curing agent, the distributed monitoring optical fiber is embedded in the curing agent and is tightly attached to a belt material of the superconducting coil, the number of turns of the distributed monitoring optical fiber is less than that of the superconducting coil, after the distributed monitoring optical fiber is embedded in the curing agent, the whole structure is tightly attached to the edge surface of the superconducting coil, and the specific process is as follows: firstly, mixing colloid components and curing liquid and filling the mixture into a cake-shaped mould with the same shape as the upper surface of the superconducting coil; after curing, coiling the distributed monitoring optical fiber into a spiral shape, and placing the spiral monitoring optical fiber on the surface of a curing agent; then, mixing a curing agent colloid component with a curing solution, coating a layer on the surface of the distributed monitoring optical fiber, and just burying the distributed monitoring optical fiber into the colloid; covering the whole body on the surface of the superconducting coil before the curing agent is completely solidified, and waiting for the curing agent to be completely solidified; finally, disassembling the mould;
the signal processing device is arranged at the downstream of the strain signal acquisition system, a strip of the superconducting coil is influenced by electromagnetic force to generate tensile strain so that the curing agent generates strain, the strain signal acquisition system measures the strain generated by the curing agent by using the distributed monitoring optical fiber to acquire a strain signal, and the signal processing device processes the strain signal to obtain the strain of the superconducting coil.
2. The apparatus of claim 1, wherein the superconducting coil has a double-pancake winding structure having an upper pancake and a lower pancake, and a tape of the superconducting coil is wound on the inner bobbin, and an insulation sheet is disposed between the upper pancake and the lower pancake.
3. The apparatus of claim 2, wherein the distributed monitoring fiber is divided into two segments in the superconducting coil, and the two segments are respectively disposed on the upper and lower edge surfaces of the superconducting coil, the outer leading segment of the distributed monitoring fiber is led out in parallel along the edge surfaces, and the inner leading segment of the distributed monitoring fiber is led out from the upper surface of the curing agent.
4. The apparatus of claim 3, wherein the outer lead-out segments of the distributed monitoring fiber are connected at the outermost turns of the coil in a single superconducting coil; in the superconducting magnet formed by a plurality of superconducting coils, the outer leading-out sections of the distributed monitoring optical fibers are sequentially connected at the outermost turns of the coils, and the inner leading-out sections of the distributed monitoring optical fibers of the adjacent superconducting coils are connected at the gap between the curing agent and the inner skeleton, so that a strain monitoring optical fiber penetrating through all the superconducting coils is formed.
5. The apparatus of claim 1, wherein the distributed monitoring fibers are arranged in one of a spiral, a petal, or a star shape on the upper and lower edge surfaces of the superconducting coil.
6. The apparatus of claim 1, wherein the distributed monitoring fiber is one of a Rayleigh, raman, or Brillouin scattering fiber.
7. The apparatus of claim 1, wherein the distributed monitoring fiber has an outer diameter of less than 200 μ ι η.
8. The apparatus of claim 1, wherein the curing agent has a room temperature thermal conductivity of 1.28W/(m-K) or more and a coefficient of thermal expansion of 30-50ppm/° c.
9. The apparatus according to claim 4, wherein the strain signal acquiring system further comprises a source light source, a first optical fiber coupler, a second optical fiber coupler, and a photodetector, both ends of the inner lead-out section of the distributed monitoring optical fiber are respectively connected to the first optical fiber coupler and the second optical fiber coupler, the photodetector is disposed downstream of the second optical fiber coupler, and the photodetector performs spectrum analysis on the signal light emitted from the second optical fiber coupler.
10. The apparatus of claim 9, wherein the strain signal acquisition system further comprises a strain signal scaling system disposed downstream of the photodetector for modifying the strain signal.
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| CN115615347A (en) | 2023-01-17 |
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