CN112484644B - Cable core deviation Dewar monitoring device for arc laying of high-temperature superconducting cable - Google Patents
Cable core deviation Dewar monitoring device for arc laying of high-temperature superconducting cable Download PDFInfo
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- CN112484644B CN112484644B CN202011160315.4A CN202011160315A CN112484644B CN 112484644 B CN112484644 B CN 112484644B CN 202011160315 A CN202011160315 A CN 202011160315A CN 112484644 B CN112484644 B CN 112484644B
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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
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
Abstract
The invention relates to a cable core deviation Dewar monitoring device for arc laying of a high-temperature superconducting cable, which comprises: the device comprises an outer Dewar pipe, a first transparent assembly, a laser source assembly, a photoelectric sensing assembly, an inner Dewar pipe and a second transparent assembly. The above-mentioned scheme that this application provided, whether convenient cable to lieing in the dewar inner tube takes place to retract eccentric core and monitors, when the laser that the laser source subassembly sent on first viewing aperture did not block by the cable that is arranged in the dewar inner tube, photoelectric sensing subassembly on the second viewing aperture just can receive laser signal this moment, then the cable that is arranged in the dewar inner tube does not take place to shrink eccentric core, when the laser that the laser source subassembly sent on first viewing aperture was blockked by the cable that is arranged in the dewar inner tube, photoelectric sensing subassembly on the second viewing aperture just can not receive laser signal this moment, then the cable that is arranged in the dewar inner tube takes place to shrink eccentric core.
Description
Technical Field
The invention relates to the technical field of superconducting cables, in particular to a cable core offset Dewar monitoring device for arc laying of a high-temperature superconducting cable.
Background
At present, a high-temperature superconducting cable is designed by adopting a Dewar structure, liquid nitrogen is not filled in an inner Dewar pipe when a high-temperature superconducting cable line is laid, and after the line is installed, the liquid nitrogen is required to be filled in the inner Dewar pipe, so that the temperature of a cable core is reduced to a liquid nitrogen temperature region.
Because the outer Dewar pipe contacts with the outside air and is in a normal temperature state, the temperature difference between the outer Dewar pipe and the inner Dewar pipe is extremely large, so that the phenomenon that the inner Dewar pipe (containing a cable core) longitudinally retracts relative to the outer Dewar pipe is easy to occur. In order to monitor the retraction amount of the cable, a contact type core-core displacement monitoring device is arranged on the traditional Dewar structure for the high-temperature superconducting cable, but the device is inconvenient for monitoring the inner Dewar pipe (containing the cable core) when the cable is retracted.
Disclosure of Invention
Therefore, it is necessary to provide a cable core offset dewar monitoring device for arc laying of a high temperature superconducting cable, aiming at the problem that the conventional dewar for the high temperature superconducting cable is inconvenient in structure for monitoring the cable core in an inner dewar pipe when the cable core is retracted.
The invention provides a cable core deviation Dewar monitoring device for arc laying of a high-temperature superconducting cable, which comprises:
the Dewar outer tube is of an open structure on two sides, and a first observation port and a second observation port are oppositely arranged on the side wall of the Dewar outer tube;
the opening sides of the first observation port and the second observation port are respectively provided with the first transparent assembly;
a laser source assembly disposed on the first transparent assembly over the first viewing port;
the photoelectric sensing assembly is arranged on the first transparent assembly on the second observation port;
the Dewar inner tube is arranged in an inner cavity of the Dewar outer tube, a cavity formed between the Dewar inner tube and the Dewar outer tube is of a closed structure, a third observation port and a fourth observation port are oppositely arranged on the side wall of the Dewar inner tube, the position of the third observation port corresponds to that of the first observation port, and the position of the fourth observation port corresponds to that of the second observation port;
and the opening sides of the third observation port and the fourth observation port are provided with the second transparent assemblies.
Above-mentioned monitoring devices, whether convenient cable to being arranged in the dewar inner tube takes place to contract and moves back eccentric core and monitor, when the laser that the laser source subassembly sent on first viewing aperture did not blockked by the cable that is arranged in the dewar inner tube, photoelectric sensing subassembly on the second viewing aperture just can receive laser signal this moment, then the cable that is arranged in the dewar inner tube does not take place to contract eccentric core, when the laser that the laser source subassembly sent on first viewing aperture blockked by the cable that is arranged in the dewar inner tube, photoelectric sensing subassembly on the second viewing aperture just can not receive laser signal by law this moment, then the cable that is arranged in the dewar inner tube takes place to contract eccentric core.
In one embodiment, the first transparent component includes a second flange, a first glass, and a third flange, the second flange is disposed on the open side of each of the first viewing port and the second viewing port, the first glass is disposed between the second flange and the third flange, and the third flange is connected to the second flange through bolts.
In one embodiment, the first transparent component further comprises a first seal disposed between the second flange and the first glass.
In one embodiment, the laser source assembly includes a laser generator and a first fixing plate, and the laser generator is fixed on the third flange on the first viewing port through the first fixing plate.
In one embodiment, the photoelectric sensing assembly comprises a laser receiver and a second fixing sheet, wherein the laser receiver is fixed on the third flange on the second observation port through the second fixing sheet.
In one embodiment, the outer dewar pipe comprises a first pipe body and a first flange, wherein both sides of the first pipe body are of an open structure, and both sides of the first pipe body are respectively provided with one first flange, and the first observation port and the second observation port are oppositely arranged on the side wall of the first pipe body;
the Dewar inner tube sets up in the first body, just the both sides of Dewar inner tube correspond with on the first body both sides first flange joint.
In one embodiment, the dewar inner pipe comprises a second pipe body, a third pipe body and a fourth pipe body, wherein the third pipe body and the fourth pipe body are respectively arranged at two sides of the second pipe body, and the diameters of the third pipe body and the fourth pipe body are both larger than that of the second pipe body;
the third observation port and the fourth observation port are oppositely arranged on the side wall of the second pipe body;
when the Dewar inner pipe is arranged in the first pipe body, the third pipe body is connected with one of the first flanges, and the fourth pipe body is connected with the other one of the first flanges.
In one embodiment, the second transparent component includes a fourth flange, a second glass, and a fifth flange, the fourth flange is disposed on the open side of the third viewing port and the open side of the fourth viewing port, the second glass is disposed between the fourth flange and the fifth flange, and the fifth flange is connected to the fourth flange through a bolt.
In one embodiment, the second transparent component further comprises a second seal disposed between the fourth flange and the second glass.
In one embodiment, the vacuum pump further comprises a vacuum valve, wherein the vacuum valve is arranged on the side wall of the outer Dewar pipe, and one end of the vacuum valve is communicated with a cavity formed between the inner Dewar pipe and the outer Dewar pipe.
Drawings
Fig. 1 is a schematic structural diagram of a cable core eccentricity dewar monitoring device for arc laying of a high temperature superconducting cable according to an embodiment of the present invention;
FIG. 2 is a schematic view of the internal structure of FIG. 1;
FIG. 3 is an exploded view of FIG. 1;
FIG. 4 is a schematic illustration of the laser source assembly of FIG. 1;
FIG. 5 is an assembled view of FIG. 4;
FIG. 6 is a schematic view of the photo-sensor assembly of FIG. 1;
FIG. 7 is an assembled view of FIG. 6;
FIG. 8 is a schematic view of the connection arc Dewar connection tube of FIG. 1;
FIG. 9 is a schematic view of the internal structure of the curved Dewar connecting tube of FIG. 8;
FIG. 10 is a schematic view of the internal structure of FIG. 8;
FIG. 11 is a schematic view of FIG. 10 with a superconductive cable inserted therein;
fig. 12 is a schematic view of fig. 1 in use.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will recognize without departing from the spirit and scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
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 implicitly indicating 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 explicitly specified otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
As shown in fig. 1 in combination with fig. 2 and fig. 3, in an embodiment of the present invention, there is provided a cable core eccentricity dewar monitoring apparatus for arc-laying of a high temperature superconducting cable, including: the device comprises a Dewar outer tube 10, a first transparent assembly, a laser source assembly 40, a photoelectric sensing assembly 50, a Dewar inner tube 20 and a second transparent assembly, wherein both sides of the Dewar outer tube 10 are of an open structure, and a first observation port 1011 and a second observation port 1012 are oppositely arranged on the side wall of the Dewar outer tube 10; a first transparent component is arranged on the opening side of each of the first viewing port 1011 and the second viewing port 1012; the laser source assembly 40 is disposed on the first transparent assembly over the first viewing port 1011; the photoelectric sensing assembly 50 is disposed on the first transparent assembly over the second viewing port 1012; the Dewar inner tube 20 is arranged in the inner cavity of the Dewar outer tube 10, a cavity formed between the Dewar inner tube 20 and the Dewar outer tube 10 is of a closed structure, a third observation port 2011 and a fourth observation port 2012 are oppositely arranged on the side wall of the Dewar inner tube 20, the position of the third observation port 2011 corresponds to the position of the first observation port 1011, and the position of the fourth observation port 2012 corresponds to the position of the second observation port 1012; a second transparent member is provided on the opening side of each of the third view port 2011 and the fourth view port 2012.
Adopt above-mentioned technical scheme, whether the cable that conveniently is located the dewar inner tube takes place to retract the core off centre and monitors, when the laser that the laser source subassembly on first viewing aperture sent does not block by the cable that is located the dewar inner tube, photoelectric sensing subassembly on the second viewing aperture just can receive laser signal this moment, then the cable that is located the dewar inner tube does not take place to shrink core off centre, when the laser that the laser source subassembly on the first viewing aperture sent is blockked by the cable that is located the dewar inner tube, photoelectric sensing subassembly on the second viewing aperture just can not receive laser signal this moment, then the cable that is located the dewar inner tube takes place to shrink core off centre.
In some embodiments, as shown in fig. 3, the first transparent member in the present application includes a second flange 301, a first glass 302, and a third flange 303, the second flange 301 is disposed on the open side of each of the first viewing port 1011 and the second viewing port 1012, the first glass 302 is disposed between the second flange 301 and the third flange 303, and the third flange 303 is connected to the second flange 301 through bolts.
Further, in order to ensure the tightness between the first glass 302 and the second flange 301, the first transparent assembly in the present application further includes a first sealing ring (not indicated in the figure) disposed between the second flange 301 and the first glass 302.
It should be noted that, the structure that the first sealing ring ensures the tightness between the second flange and the third flange in the embodiment of the present application is only an example, and in other alternative solutions, other structures may also be adopted, for example, a sealing glue is provided between the second flange and the third flange. The present application does not specifically limit the specific structure of how the airtightness between the second flange and the third flange is ensured, as long as the above-described structure can achieve the object of the present application.
In some embodiments, as shown in FIG. 4, the laser source assembly 40 herein includes a laser generator 401 and a first stator 402, wherein the laser generator 401 is fixed to the third flange 303 on the first viewing port 1011 by the first stator 402.
Specifically, as shown in fig. 5, the laser source assembly 40 includes two laser generators 401 and two first fixing plates 402, wherein each laser generator 401 is fixed on the corresponding first fixing plate 402 by bolts, and then the first fixing plate 402 is fixed on the third flange 303 on the first observation port 1011 by bolts, and at this time, the two laser generators 401 are oppositely disposed.
In some embodiments, as shown in FIG. 6, the optoelectronic sensing assembly 50 of the present application includes a laser receiver 501 and a second stator 502, wherein the laser receiver 501 is fixed on the third flange 303 on the second viewing port 1012 by the second stator 502.
Specifically, as shown in fig. 7, the photoelectric sensing assembly 50 includes two laser receivers 501 and two second fixing pieces 502, wherein each laser receiver 501 is fixed on the corresponding second fixing piece 502 by a bolt, and then the second fixing piece 502 is fixed on the third flange 303 on the second observation port 1012 by a bolt, and at this time, the two laser receivers 501 are arranged oppositely.
In some embodiments, as shown in fig. 3, the outer dewar pipe 10 of the present application includes a first pipe body 101 and a first flange 102, both sides of the first pipe body 101 are of an open structure, and both sides of the first pipe body 101 are respectively provided with one first flange 102, and a first viewing port 1011 and a second viewing port 1012 are oppositely disposed on the side wall of the first pipe body 101; the dewar inner pipe 20 is disposed inside the first pipe body 101, and both sides of the dewar inner pipe 20 are correspondingly connected with the first flanges 102 on both sides of the first pipe body 101.
Further, the dewar inner tube 20 includes a second tube 201, a third tube 202 and a fourth tube 203, the third tube 202 and the fourth tube 203 are respectively disposed at two sides of the second tube 201, and the diameters of the third tube 202 and the fourth tube 203 are both larger than the diameter of the second tube 201; the third viewing port 2011 and the fourth viewing port 2012 are oppositely arranged on the side wall of the second tube 201; when dewar inner tube 20 is disposed within first tubular body 101, third tubular body 202 is connected to one of first flanges 102 and fourth tubular body 203 is connected to the other of first flanges 102.
In some embodiments, as shown in fig. 3, the second transparent component in the present application includes a fourth flange 601, a second glass 602, and a fifth flange 603, the fourth flange 601 is disposed on the open sides of the third viewing port 2011 and the fourth viewing port 2012, the second glass 602 is disposed between the fourth flange 601 and the fifth flange 603, and the fifth flange 603 is connected to the fourth flange 601 through a bolt.
Further, in order to ensure the tightness between the fourth flange 601 and the second glass 602, the second transparent assembly in the present application further includes a second sealing ring (not indicated in the figure) disposed between the fourth flange 601 and the second glass 602.
In some embodiments, in order to conveniently evacuate the cavity formed between the inner dewar pipe 20 and the outer dewar pipe 10, as shown in fig. 1 and fig. 2, the cable core eccentricity dewar monitoring apparatus for high temperature superconducting cable in the present application further includes a vacuum valve 70, the vacuum valve 70 is disposed on the sidewall of the outer dewar pipe 10, and one end of the vacuum valve 70 is communicated with the cavity formed between the inner dewar pipe 20 and the outer dewar pipe 10.
When the cavity formed between the inner dewar tube 20 and the outer dewar tube 10 needs to be evacuated, it is only necessary to connect the vacuum valve 70 with a suction pump through an air tube and then start the suction pump.
In summary, the invention of the present application, when in use:
as shown in fig. 8 in combination with fig. 9, two arc-shaped dewar connecting pipes 801 are first installed on both sides of dewar inner pipe 20 on the cable core off-center dewar monitoring apparatus, at this time, one end of arc-shaped dewar connecting pipe 801 is extended into second pipe 201 on dewar inner pipe 20, then connecting flange 8013 on arc-shaped dewar connecting pipe 801 with first flange 102, and simultaneously, vacuum is pumped between outer pipe 8011 and inner pipe 8012 on arc-shaped dewar connecting pipe 801 through vacuum valve 8014 on arc-shaped dewar connecting pipe 801, and schematic diagrams of arc-shaped dewar connecting pipe 801 and dewar inner pipe 20 are shown in fig. 10, then cable 100 is passed through one of arc-shaped dewar connecting pipes 801, dewar inner pipe 20 and another of arc-shaped superconducting dewar connecting pipes 801 in sequence (as shown in fig. 11), and then liquid nitrogen is filled into an inner cavity formed between one of arc-shaped dewar connecting pipes 801, dewar inner pipe 20 and another of arc-shaped dewar connecting pipe 801, and finally, as shown in fig. 12, when the laser emitted by the laser source assembly at the first view port is not blocked by the cable located in the dewar inner tube, the photoelectric sensing assembly at the second view port can receive the laser signal, the cable located in the dewar inner tube does not contract and deviate from the core, and when the laser emitted by the laser source assembly at the first view port is blocked by the cable located in the dewar inner tube, the photoelectric sensing assembly at the second view port cannot receive the laser signal, and the cable located in the dewar inner tube contracts and deviates from the core.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (10)
1. A cable core deviation Dewar monitoring device for arc laying of high temperature superconducting cable is characterized by comprising:
the device comprises a Dewar outer tube (10), wherein both sides of the Dewar outer tube (10) are of an opening structure, and a first observation port (1011) and a second observation port (1012) are oppositely arranged on the side wall of the Dewar outer tube (10);
a first transparent component disposed on an open side of each of the first viewing port (1011) and the second viewing port (1012);
a laser source assembly (40), the laser source assembly (40) disposed on a first transparent assembly over the first viewing port (1011);
a photoelectric sensing assembly (50), said photoelectric sensing assembly (50) disposed on a first transparent assembly over said second viewing port (1012);
the Dewar inner tube (20) is arranged in an inner cavity of the Dewar outer tube (10), a cavity formed between the Dewar inner tube (20) and the Dewar outer tube (10) is of a closed structure, a third observation port (2011) and a fourth observation port (2012) are oppositely arranged on the side wall of the Dewar inner tube (20), the position of the third observation port (2011) corresponds to the position of the first observation port (1011), and the position of the fourth observation port (2012) corresponds to the position of the second observation port (1012);
a second transparent component, the open side of the third viewing port (2011) and the fourth viewing port (2012) all being provided with the second transparent component.
2. The high-temperature superconducting cable arc-laid cable core eccentricity Dewar monitoring device as claimed in claim 1, wherein the first transparent component comprises a second flange (301), a first glass (302) and a third flange (303), the second flange (301) is arranged on the opening side of each of the first observation port (1011) and the second observation port (1012), the first glass (302) is arranged between the second flange (301) and the third flange (303), and the third flange (303) is connected with the second flange (301) through bolts.
3. The hts cable arch-laid core-offset dewar monitoring device of claim 2, wherein said first transparent component further comprises a first sealing ring, said first sealing ring being disposed between said second flange (301) and said first glass (302).
4. The high temperature superconducting cable arc-laying cable core eccentricity Dewar monitoring device as claimed in claim 2, wherein the laser source assembly (40) comprises a laser generator (401) and a first fixing plate (402), the laser generator (401) being fixed on the third flange (303) on the first viewing port (1011) by the first fixing plate (402).
5. The hts cable arch-laying core eccentricity dewar monitoring device according to claim 2, characterized in that the optoelectronic sensing assembly (50) comprises a laser receiver (501) and a second fixing plate (502), the laser receiver (501) is fixed on the third flange (303) on the second viewing port (1012) through the second fixing plate (502).
6. The high-temperature superconducting cable core deviation Dewar monitoring device in arc laying of high-temperature cables as claimed in claim 1, wherein the Dewar outer tube (10) comprises a first tube body (101) and a first flange (102), both sides of the first tube body (101) are of an open structure, and both sides of the first tube body (101) are respectively provided with one first flange (102), and the first observation port (1011) and the second observation port (1012) are oppositely arranged on the side wall of the first tube body (101);
dewar inner tube (20) set up in first body (101), just the both sides of Dewar inner tube (20) correspond with first body (101) both sides on first flange (102) are connected.
7. The high-temperature superconducting cable core eccentricity Dewar monitoring device according to claim 6, wherein the Dewar inner tube (20) comprises a second tube body (201), a third tube body (202) and a fourth tube body (203), the third tube body (202) and the fourth tube body (203) are respectively arranged on two sides of the second tube body (201), and the diameters of the third tube body (202) and the fourth tube body (203) are both larger than the diameter of the second tube body (201);
the third observation port (2011) and the fourth observation port (2012) are oppositely arranged on the side wall of the second pipe body (201);
the third pipe body (202) is connected to one of the first flanges (102), and the fourth pipe body (203) is connected to the other of the first flanges (102).
8. The high-temperature superconducting cable core eccentricity Dewar monitoring device as claimed in claim 7, wherein the second transparent component comprises a fourth flange (601), a second glass (602) and a fifth flange (603), the fourth flange (601) is arranged on the open sides of the third viewing port (2011) and the fourth viewing port (2012), the second glass (602) is arranged between the fourth flange (601) and the fifth flange (603), and the fifth flange (603) is connected with the fourth flange (601) through bolts.
9. The hts cable arch-laying core-offset dewar monitoring device of claim 8, wherein said second transparent component further comprises a second sealing ring, said second sealing ring being disposed between said fourth flange (601) and said second glass (602).
10. The high temperature superconducting cable arc-laying cable core eccentricity Dewar monitoring device as claimed in claim 1, further comprising a vacuum valve (70), wherein the vacuum valve (70) is arranged on a side wall of the outer Dewar pipe (10), and one end of the vacuum valve (70) is communicated with a cavity formed between the inner Dewar pipe (20) and the outer Dewar pipe (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011160315.4A CN112484644B (en) | 2020-10-27 | 2020-10-27 | Cable core deviation Dewar monitoring device for arc laying of high-temperature superconducting cable |
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| CN202011160315.4A CN112484644B (en) | 2020-10-27 | 2020-10-27 | Cable core deviation Dewar monitoring device for arc laying of high-temperature superconducting cable |
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| CN114336102B (en) * | 2021-11-18 | 2023-07-25 | 深圳供电局有限公司 | Superconducting cable joint and device |
| CN114300297B (en) * | 2021-12-30 | 2024-01-12 | 深圳供电局有限公司 | Superconducting isolating switch |
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| JPH05119136A (en) * | 1991-09-30 | 1993-05-18 | Shimadzu Corp | Measuring method for position and direction of detection coil of squid sensor |
| JPH07333058A (en) * | 1994-06-10 | 1995-12-22 | Mitsubishi Electric Corp | Dewar for mounting infrared-ray detecting element |
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| JP5119136B2 (en) * | 2008-12-03 | 2013-01-16 | 富士フイルム株式会社 | Electronic device and control method thereof |
| CN103364743A (en) * | 2013-07-08 | 2013-10-23 | 兰州大学 | Visual low-temperature Dewar system for superconducting film magnetic-thermal characteristic tests |
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