CN214667321U - High-temperature superconductor temperature monitoring device - Google Patents
High-temperature superconductor temperature monitoring device Download PDFInfo
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- CN214667321U CN214667321U CN202120035686.3U CN202120035686U CN214667321U CN 214667321 U CN214667321 U CN 214667321U CN 202120035686 U CN202120035686 U CN 202120035686U CN 214667321 U CN214667321 U CN 214667321U
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Abstract
The utility model provides a high temperature superconductor temperature monitoring device, it includes fiber grating temperature sensor, inside the sample skeleton of the high temperature superconductor of waiting to monitor the temperature was directly embedded into to fiber grating temperature sensor. According to the method, the fiber grating temperature sensor is embedded into the superconducting tape or superconducting magnet sample framework, so that the fiber grating temperature sensor can be effectively protected, the problem of fiber grating wavelength distortion caused by adhesive is avoided, and the measurement is stable and reliable. In addition, aiming at the research of the quench characteristic mechanism of the high-temperature superconducting tape, the non-adhesive fiber bragg grating temperature sensor can be used for multiple times, so that the waste is avoided, and the method has the characteristics of economy and saving.
Description
Technical Field
The utility model relates to a high temperature superconductor temperature monitoring technology device field especially relates to high temperature superconductor temperature monitoring devices.
Background
Through the development of many years, electric power equipment such as motors, transformers, current limiters, energy storage magnets and the like made of high-temperature superconductors has been tried to be used in the fields of high-energy physics, aerospace, medical equipment, transportation, electric power energy and the like. However, the stability concerns in high temperature superconductor applications have been a key factor limiting their use. The superconductor has the advantages of zero resistance, complete diamagnetism and the like which are not possessed by the conventional conductor only when the superconductor is in a superconducting state. In practical application, the superconductor usually works in a complex environment of low temperature, high current and strong magnetic field, and the phenomenon of quench occurs when the superconductor exits from a superconducting state due to the disturbance of electromagnetic force, heat accumulation and the like which cannot be resisted under certain conditions. Once the superconductor exits the superconducting state, it will exhibit a large resistance, resulting in the generation of joule heat. If the quench phenomenon is not discovered in time and the generated joule heat is released rapidly, the catastrophic consequences and huge economic loss are brought to the superconducting magnet. Therefore, in order to enable the high-temperature superconductor to operate stably, it is necessary to research the quench mechanism of the high-temperature superconductor and develop an advanced and stable online monitoring technology for the high-temperature superconductor.
Currently, the most common quench detection methods are a voltage detection method based on a voltage signal occurring after quench and a temperature detection method based on a temperature rise signal. Among them, the voltage detection method is basically applicable only to short strip samples. On the one hand, superconducting coils generally have a large inductance and thus introduce errors into the measurement of the voltage signal. On the other hand, a signal that can be detected occurs in the superconducting magnet only when the operating temperature of the magnet is greater than the shunt temperature, i.e., for a quench, the temperature signal rises before the voltage signal. Therefore, the voltage detection method has a certain delay compared to the temperature detection method. Therefore, the quench detection method based on temperature detection is a feasible detection method. The temperature detection is practical in the aspect of monitoring the running state of the high-temperature superconducting magnet, has important value in the aspect of researching the quench mechanism of the high-temperature superconductor, can understand and master the quench mechanism of the high-temperature superconductor better from the essence through researching parameters such as the shunt temperature of the high-temperature superconductor, and provides a theoretical basis for the online temperature monitoring technology of the high-temperature superconductor.
The conventional temperature detection method is usually based on the conventional electric temperature sensors such as a thermocouple and a thermal resistor, and is based on the measurement of an electric signal, and the high-temperature superconducting magnet is usually operated in a strong magnetic field environment, so that the measurement result is susceptible to electromagnetic interference. Meanwhile, sensors such as a thermocouple and a thermal resistor are point measurement type sensors, a large number of sensors are needed to be used for realizing distributed temperature measurement of a magnet, each sensor is generally in a 4-wire connection method, a large number of copper lead wires are needed to be used, wiring needs to occupy a large amount of space, and meanwhile, the problem of heat leakage of a low-temperature system is also caused due to the fact that the copper lead wires are used in a large amount.
The optical fiber sensor has the characteristics of small volume, light weight, electromagnetic interference resistance, easy multiplexing and the like, can overcome the defects of the traditional electric sensor, and is used in the field of quench mechanism research of high-temperature superconductors and online temperature monitoring of the high-temperature superconductors. According to the working principle, the optical fiber sensor can be divided into a distributed optical fiber sensor and a fiber grating sensor. At present, researches on the application of two sensing technologies to the fields of high-temperature superconducting magnet quench detection and online temperature monitoring are carried out at home and abroad. In the aspect of distributed optical fiber sensing, distributed optical fiber sensing technologies based on rayleigh scattering, raman scattering and the like have been tried to be used in high temperature superconductor quench detection. For example, chinese patent application No.: 201910531156.5, patent name: a high-temperature superconducting magnet quench detection system utilizing a distributed optical fiber sensing technology provides a high-temperature superconducting magnet quench detection method based on a backward Rayleigh scattering distributed optical fiber sensing technology, and introduces the system. Chinese patent application No.: 201410375117.8, patent name: a superconducting tape with an internal sealing measuring optical fiber and a preparation method and a device thereof provide a method for internally sealing a distributed optical fiber into a high-temperature superconducting tape, and realize the distributed measurement of the temperature of the high-temperature superconducting tape and a coil by using the method. Chinese patent application No.: 201280058234.0, patent name: a method for detecting normal excessive conduction of a superconducting wire rod provides a method for detecting a high-temperature superconducting wire rod from a superconducting state to a normal state based on a Raman distributed optical fiber sensing technology. The feasibility of the distributed optical fiber sensing technology used for high-temperature superconductor quench detection and online temperature monitoring is verified at present, and a hope is brought to a novel quench detection technology of a high-temperature superconductor. However, the problems of spatial resolution of the distributed fiber sensor, the speed required for processing a large amount of data, the reliability of the measurement, and how to reduce the cost of expensive demodulation equipment still need to be further studied.
Compared with a distributed optical fiber sensor, the fiber grating sensor is a wavelength demodulation sensor and has higher temperature measurement stability and reliability. In the aspects of high-temperature superconductor quench detection and online temperature monitoring based on the fiber bragg grating temperature sensor, the retrieval shows that the Chinese patent application number: 201180005090.8, patent name: a method for detecting the normal conduction transition of a superconducting wire rod provides a method for sticking a plurality of fiber bragg grating temperature sensors on the surface of a high-temperature superconducting tape to monitor the temperature, so that the superconducting wire rod is changed from a superconducting state to a normal conduction state. In non-patent literature, both american scholars m.turanne and beijing university of transportation have developed methods for detecting quench of high temperature superconductors based on surface-mounted fiber grating temperature sensors. However, it has been found through research that the above method uses low-temperature glue to adhere the fiber grating temperature sensor to the surface of the high-temperature superconducting tape, and it is difficult to ensure the uniformity of the low-temperature glue around the fiber grating temperature sensor, so that the chirp phenomenon may occur in the fiber grating sensor, which may cause unstable temperature measurement. In addition, in practical application, due to the embedding and pasting of the fiber grating temperature sensor, the feasibility of destroying the inherent performance of the high-temperature superconductor or the high-temperature superconducting magnet can also appear. In the aspect of economy, aiming at the research of a quench detection mechanism of a high-temperature superconducting tape, the fiber grating temperature sensor adhered to the surface cannot be safely stripped from a sample after an experiment, cannot be recycled, and has the problem of device waste.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome prior art not enough, provide high temperature superconductor temperature monitoring devices, inside this method imbeds superconducting tape or superconducting magnet sample skeleton with fiber grating temperature sensor, can effectively protect fiber grating temperature sensor, the problem of avoiding the fiber grating wavelength distortion that leads to by gluing for the measurement has stable, reliable characteristics. In addition, aiming at the research of the quench characteristic mechanism of the high-temperature superconducting tape, the non-adhesive fiber bragg grating temperature sensor can be used for multiple times, waste is avoided, and the method has the characteristics of economy and economy.
In order to realize the technical characteristics, the purpose of the utility model is realized as follows: the high-temperature superconductor temperature monitoring device comprises a fiber grating temperature sensor, wherein the fiber grating temperature sensor is directly embedded into a sample framework of a high-temperature superconductor with temperature to be monitored.
The fiber grating temperature sensor is packaged in the protective sleeve and protects the protective sleeve.
The protective sleeve adopts a capillary tube with high thermal conductivity.
The fiber grating temperature sensor is coated with a material with a large thermal expansion coefficient, and the temperature sensitivity of the coated fiber grating temperature sensor is ensured to meet the temperature measurement requirement in a liquid nitrogen temperature operation area.
The inner diameter of the capillary tube is matched with the outer diameter of the optical fiber of the fiber grating temperature sensor, and the capillary tube and the optical fiber are ensured to have a small gap, so that the thermal delay between the high-temperature superconducting measured object and the fiber grating temperature sensor during temperature measurement is reduced.
The high-temperature superconductor with the temperature to be monitored comprises a high-temperature superconducting magnet and a high-temperature superconducting strip;
the method is used for on-line temperature monitoring of the high-temperature superconducting magnet and research on the quench mechanism and the temperature propagation characteristic of the high-temperature superconducting strip;
when the online temperature monitoring of the high-temperature superconducting magnet is carried out, the fiber bragg grating temperature sensor is embedded into a sample framework close to the inner side of a coil of the high-temperature superconducting magnet, and the temperature of a point where the quench phenomenon is most likely to occur at the maximum position of the magnetic field of the coil is monitored.
When the quench mechanism and the temperature propagation characteristic of the high-temperature superconducting tape are researched, the fiber bragg grating temperature sensor embedded into the sample framework can be repeatedly used after the experiment is finished.
When the quench mechanism and the temperature propagation characteristic of the high-temperature superconducting tape are researched, a plurality of optical fiber strings engraved with a plurality of optical fiber grating temperature sensors are used for temperature measurement, the optical fiber grating sensors on the optical fiber strings can be distributed in a staggered mode, and distributed measurement of the temperature in a measurement area is achieved.
The utility model discloses there is following beneficial effect:
1. the utility model provides a high temperature superconductor temperature monitoring devices and method based on non-stick fiber grating temperature sensor can be effective, reliable carry out the temperature monitoring of high temperature superconducting tape and magnet, especially when carrying out the quench mechanism research of high temperature superconducting tape, this method has very big advantage. On one hand, the fiber bragg grating temperature sensor can be protected through the encapsulation of the capillary tube, so that the temperature measurement of the fiber bragg grating temperature sensor is more stable; and on the other hand, the non-adhesive fiber grating temperature sensor can be repeatedly used before and after testing, so that the testing cost can be saved.
2. The utility model discloses a monitoring devices and method to the online temperature monitoring of high temperature superconducting magnet, have huge advantage equally, with the embedding of fiber grating temperature sensor this skeleton of appearance inside the magnet manufacturing process, can carry out real-time temperature monitoring to the place of the biggest department of magnetic field in the high temperature superconducting magnet, the most easy quench. Due to the non-sticking contact between the fiber grating temperature sensor and the magnet, the damage to the superconducting magnet caused by the introduction of the sensor is basically avoided.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic diagram of a superconducting magnet with a sample skeleton embedded with a fiber grating temperature sensor.
In the figure: 1 is a magnet coil framework, 2 is a high-temperature superconducting magnet coil, and 3 is a fiber bragg grating temperature sensor.
FIG. 2 is a schematic diagram of a sample of superconducting tape with a sample skeleton embedded in a fiber grating temperature sensor.
In the figure: 4 is a first G10 sample skeleton, 5 is a high-temperature superconducting tape, and 6 is a first fiber grating temperature sensor with a capillary tube packaging structure embedded in the sample introduction skeleton.
FIG. 3 is a schematic diagram of a sample skeleton for a superconducting tape quench detection experiment embedded with a fiber grating temperature sensor to protect a capillary tube.
In the figure: 7 is a second G10 sample skeleton, 8 is a groove formed on the sample skeleton, 9 is a screw hole formed on the sample skeleton, and 10 is a capillary tube embedded in the groove.
FIG. 4 is a partially enlarged view of a sample skeleton for a superconducting tape quench detection experiment after embedding a fiber grating temperature sensor.
In the figure: 8 is a groove formed on the sample skeleton, 20 and 21 are two transmission optical fibers, 12, 14, 16 and 18 are fiber grating temperature sensors on the optical fiber 20, and 11, 13, 15, 17 and 19 are fiber grating temperature sensors on the optical fiber 21.
FIG. 5 is a schematic view of a skeleton of an experimental sample after the experimental sample of the high-temperature superconducting tape is mounted.
FIG. 6 is a three-dimensional perspective view of the high-temperature superconducting tape quench detection integrated device based on a non-adhesive fiber grating temperature sensor.
FIG. 7 is a front view of the high-temperature superconducting tape quench detection integrated apparatus based on a non-adhesive fiber grating temperature sensor.
FIG. 8 shows the results of heating resistance heat pulse trigger tests at a liquid nitrogen temperature of 77K.
Fig. 9 shows the test results of the heat pulse triggered quench test when the transmission current is 0.5 times the critical current.
FIG. 10 quench test results under overcurrent conditions.
Fig. 11 (a) and (b) show the room temperature spectra of the fiber grating temperature sensor taken out of the sample frame after the experiment.
Detailed Description
The following describes embodiments of the present invention with reference to the accompanying drawings.
Example 1:
referring to fig. 1-7, the high temperature superconductor temperature monitoring device comprises a fiber grating temperature sensor 3, wherein the fiber grating temperature sensor 3 is directly embedded in the sample skeleton of the high temperature superconductor with the temperature to be monitored. Through adopting the utility model discloses a temperature monitoring device, it is inside the sample skeleton that advances high temperature superconducting tape or high temperature superconducting magnet with the 3 embedding of fiber grating temperature sensor, and not directly paste fiber grating temperature sensor on high temperature superconducting magnet or high temperature superconductor's surface, can protect high temperature superconducting tape or high temperature superconducting magnet's performance not destroyed, and then improved measurement accuracy and reliability.
Further, the fiber grating temperature sensor 3 is packaged inside the protective sleeve and protects the protective sleeve.
Further, the protective sleeve adopts a capillary tube with high thermal conductivity. The capillary tube has high thermal conductivity, and the capillary tube can protect the fiber grating temperature sensor from being influenced by disturbance such as unexpected stress and the like, so that the temperature measurement of the fiber grating temperature sensor is more stable.
Furthermore, the fiber grating temperature sensor 3 is a fiber grating temperature sensor coated with a material with a large thermal expansion coefficient, and the temperature sensitivity of the coated fiber grating temperature sensor is ensured to meet the temperature measurement requirement in a liquid nitrogen temperature operation area.
Furthermore, the inner diameter of the capillary is matched with the outer diameter of the optical fiber of the fiber grating temperature sensor 3, and the small gap between the capillary and the optical fiber grating temperature sensor is ensured, so that the thermal delay between the high-temperature superconducting measured object and the fiber grating temperature sensor during temperature measurement is reduced, and meanwhile, the inner diameter of the capillary is matched with the diameter of the optical fiber, so that the optical fiber can conveniently penetrate through the capillary during installation.
Further, the high-temperature superconductor with the temperature to be monitored comprises a high-temperature superconducting magnet and a high-temperature superconducting tape; the method is used for on-line temperature monitoring of the high-temperature superconducting magnet and research on the quench mechanism and the temperature propagation characteristic of the high-temperature superconducting strip;
when the online temperature monitoring of the high-temperature superconducting magnet is carried out, the fiber bragg grating temperature sensor 3 is embedded into a sample framework close to the inner side of the high-temperature superconducting magnet coil 2, and the temperature of a point where the quench phenomenon is most likely to occur at the maximum position of the coil magnetic field is monitored.
Furthermore, when the quench mechanism and the temperature propagation characteristic of the high-temperature superconducting tape are researched, the fiber bragg grating temperature sensor 3 embedded into the sample framework can be recycled after the experiment is finished, and the method has the characteristics of economy and economy.
Furthermore, when a quench mechanism and a temperature propagation characteristic of the high-temperature superconducting tape are researched, a plurality of optical fiber strings with a plurality of optical fiber grating temperature sensors are adopted for temperature measurement, the optical fiber grating sensors on the optical fiber strings can be distributed in a staggered mode, and distributed measurement of the temperature in a measurement area is achieved.
Example 2:
referring to fig. 1, when the fiber bragg grating temperature sensor is used for online monitoring of the temperature of the high-temperature superconducting magnet, the fiber bragg grating temperature sensor may be embedded into the magnet coil former 1. Fig. 1 is a schematic diagram of a pancake-type superconducting magnet with a fiber grating temperature sensor embedded in a sample skeleton. Fig. 1 is merely an example, and in practical applications, the superconducting magnet may be a magnet having any other structure, such as a horseshoe coil. Wherein, 1 is a magnet coil framework, 2 is a high-temperature superconducting magnet coil, and 3 is a fiber bragg grating temperature sensor. According to the working principle of the high-temperature superconducting coil and the knowledge of electromagnetism, the surface magnetic field intensity at the inner side of the high-temperature superconducting magnet coil 2 close to the magnet coil framework 1 is the largest, so that the point is the point where the coil is easy to exceed the existing temperature rise signal. Therefore, in the process of manufacturing the high-temperature superconducting magnet, the fiber bragg grating temperature sensor 3 is embedded into the magnet coil framework 1, and the method has practical application significance. Since the magnet bobbin 1 and the high-temperature superconducting magnet coil 2 are in rigid contact and are usually fixed by epoxy resin glue, the fiber grating temperature sensor 3 embedded inside the high-temperature superconducting magnet coil 2 should be a sensor with a protective sleeve structure. In order to reduce the temperature delay between the superconductor to be measured and the fiber grating sensor, the protective sleeve should be made of a material with high thermal conductivity, the inner diameter of the protective sleeve is not too large, and the protective sleeve should be matched with the diameter of the optical fiber so as to facilitate the optical fiber to pass through. Meanwhile, in order to avoid damage to the high-temperature superconducting magnet caused by the embedding of the external substances, no protrusion is formed on the surface of the magnet coil framework 2 after the fiber bragg grating temperature sensor 3 is embedded. In order to improve the measurement accuracy, the fiber grating temperature sensor 3 may be a sensor coated with a material having a large thermal expansion coefficient. Fig. 1 is only an example, and only one fiber grating temperature sensor is shown, and in practical applications, the number and arrangement of the fiber grating sensors may be adjusted according to actual requirements.
Example 3:
referring to fig. 2, when the fiber grating temperature sensor is used for researching the quench mechanism and the temperature propagation characteristic of the high-temperature superconducting tape, the fiber grating temperature sensor may be embedded inside the first G10 sample skeleton. As shown in fig. 2, the sample skeleton is embedded in the superconducting tape sample of the fiber grating temperature sensor. Wherein, 4 is a first G10 sample skeleton, 5 is a high-temperature superconducting tape, and 6 is a first fiber grating temperature sensor with a capillary packaging structure embedded in the sample introduction skeleton. In order to reduce the temperature delay between the superconductor to be measured and the fiber grating sensor, the protective sleeve should be made of a material with high thermal conductivity, the inner diameter of the protective sleeve is not too large, and the protective sleeve should be matched with the diameter of the optical fiber so as to facilitate the optical fiber to pass through. Meanwhile, in order to avoid the damage of the embedding of the foreign matters to the high-temperature superconducting tape sample, the surface of the sample framework 4 embedded into the first fiber grating temperature sensor 6 is ensured not to be convex. To improve the measurement accuracy, the first fiber grating temperature sensor 6 may be a sensor coated with a material having a large thermal expansion coefficient. In order to increase the contact between the high-temperature superconducting tape 5 and the first fiber grating temperature sensor 6 and reduce the measurement error, the high-temperature superconducting tape 5 is adhered and fixed to the first G10 sample skeleton 4 along the tape edge, and a heat-conducting material such as heat-conducting silicone grease is applied to the position where the high-temperature superconducting tape 5 contacts the first fiber grating temperature sensor 6 before adhering and fixing. In order to ensure that the fiber grating temperature sensor can be taken out smoothly after the experiment so as to be reused, the first fiber grating temperature sensor 6 and the protective copper tube are not adhered, and a special channel for laying optical fibers can be designed on the first G10 sample skeleton 4. Fig. 2 is only an illustration, and only one fiber grating temperature sensor is shown, in practical application, the number and arrangement of the fiber grating sensors may be adjusted according to practical requirements.
Example 4:
in order to prove the effectiveness of the method of the present invention, the following detailed description is provided in conjunction with the specific embodiment of the quench characteristic study of the high temperature superconducting tape of the non-adhesive fiber grating temperature sensor. As shown in fig. 3, a schematic diagram of a sample skeleton for a superconducting tape quench detection experiment embedded with a fiber grating temperature sensor to protect a capillary tube. Wherein, 7 is the second G10 sample skeleton, 8 is the recess of opening on the sample skeleton, 9 is the screw of opening on the sample skeleton, 10 is the capillary of embedding in the recess. In order to embed the fiber grating temperature sensor inside the second G10 sample skeleton 7, first, a groove 8 is made in the center of the sample skeleton for placing a capillary 10 for protecting the fiber grating sensor. Meanwhile, the second G10 sample skeleton 7 is provided with screw holes 9 for connecting current leads and fixing the sample. The size of the grooves 8 may be determined according to the number and size of the capillaries 10. In the embodiment, the selected capillary is a copper capillary tube with an inner diameter and an outer diameter of 0.4 mm and 0.8mm respectively, and the fiber grating temperature sensors on the two optical fibers are arranged side by side in the implementation. Therefore, the width of the groove 8 is 2 mm, and the temperature difference between two temperature measuring optical fibers arranged side by side can be reduced. Meanwhile, in order to ensure that the surface of the second G10 sample skeleton 7 has no obvious protrusions after being inserted into the capillary 10, the depth of the groove 8 is 0.8mm, which is the same as the outer diameter of the capillary. After the groove 8 is formed, the capillary 10 is fixed in the groove 8 by low-temperature glue. In order to realize the distributed measurement of the temperature in the experimental measurement area, the embodiment adopts two optical fibers with 5 fiber grating temperature sensors respectively engraved for temperature measurement, the length of the fiber grating temperature sensor is 8mm, and the distance between two adjacent fiber grating temperature sensors is also 8 mm. In order to achieve the purpose of distributed temperature measurement of the fiber grating temperature sensors, in this embodiment, the number of the embedded capillaries 10 is 10, which is the same as that of the fiber grating temperature sensors, and meanwhile, the 10 capillary copper tubes are distributed in a staggered manner, so as to achieve the purpose of utilizing the fiber grating temperature sensors on the two optical fibers to achieve staggered temperature distribution measurement. In practical application, the number and arrangement of the fiber gratings can be changed according to practical requirements. After the capillary copper tube embedded into the groove 8 is fixed in the groove, two gratings with 5 fiber grating temperature sensors are installed into the sample framework 7.
Example 5:
as shown in fig. 4, a partial enlarged view of the sample skeleton for superconducting tape quench detection experiments after embedding the fiber grating temperature sensor. Wherein 8 is a groove formed on the sample skeleton, 20 and 21 are two transmission optical fibers, 12, 14, 16 and 18 are fiber grating temperature sensors on the optical fiber 20, and 11, 13, 15, 17 and 19 are fiber grating temperature sensors on the optical fiber 21. After the capillary 10 inserted into the groove 8 is well fixed in the groove, the optical fibers 20 and 21 are introduced into the capillary in the groove 8. Make the fiber grating temperature sensor on the optic fibre be located the inside of protection capillary just, for the influence between the derivation of convenient optic fibre and avoiding two optic fibres, should make the joint of optic fibre and demodulation appearance be located the both ends of sample skeleton respectively when the installation. After the optical fibers 20 and 21 are introduced into the groove 8 and the corresponding fiber grating temperature sensors are ensured to be positioned inside the protective capillary, the optical fibers are fixed. In order to ensure that the temperature measurement of the fiber grating temperature sensor is not affected by strain, in the present embodiment, only one end of the optical fiber close to the demodulator is fixed in the groove 8 by adhesion, and the tail ends of the optical fibers 20 and 21 are in a free state. And after the fiber bragg grating temperature sensor is installed in the sample skeleton, starting to install the high-temperature superconducting tape experimental sample.
Example 6:
as shown in fig. 5, a schematic diagram of the skeleton of the experimental sample after the experimental sample of the high-temperature superconducting tape is mounted is shown, wherein 7 is a G10 sample skeleton, 9 is a screw hole formed on the sample skeleton, 20 and 21 are two optical fibers, 22 is the high-temperature superconducting tape, and 23 is a heating resistor sheet on the surface of the high-temperature superconducting tape 22. The high-temperature superconducting tape 22 is adhered and fixed on the second G10 sample skeleton 7 along the tape edge by using low-temperature glue, so that the rigid contact between the high-temperature superconducting tape 22 and the fiber grating temperature sensor is ensured as much as possible, and the measurement error is reduced. Before the high-temperature superconducting tape 22 is adhered and fixed, a position where the high-temperature superconducting tape is in contact with the fiber grating temperature sensor is coated with a heat conduction material such as heat conduction silicone grease, so that heat conduction between the high-temperature superconducting tape to be detected and the fiber grating temperature sensor is increased. In order to perform the high-temperature superconductor quench test caused by the heat pulse trigger, a heating resistor sheet 23 for generating the heat pulse is adhered to the surface of the high-temperature superconducting tape 22. The heating resistor 23 and the FBG temperature sensor 15 are in the same vertical position, so that after the heat pulse is generated, in the case that the embodiment is effective, the response of the FBG temperature sensor 15 is first generated, and then the response is propagated to the two ends in sequence. After the high-temperature superconducting tape is installed and fixed, the optical fibers 20 and 21 are sealed at the outlet of the groove on the sample framework by using heat insulation sealant so as to prevent the penetration of liquid nitrogen during the experiment. After the high-temperature superconducting tape sample is installed, the whole experimental device including the current lead and the sealing device is assembled.
Example 7:
as shown in fig. 6-7, the high temperature superconducting tape quench detection integrated apparatus based on non-bonded FBG is shown, wherein 7 is G10 sample skeleton, 22 is high temperature superconducting tape, 24 is heat insulation means, 25 is groove on the heat insulation means, and 26 is current lead connection terminal. In the experiment for researching the quench characteristic of the high-temperature superconducting tape, in order to avoid the phenomenon that the temperature rise cannot be detected due to too large liquid nitrogen cooling power, the heat insulation treatment is generally carried out on the detected area. The thermal insulation device adopted in the embodiment is a polystyrene foam board, the thermal insulation device 24 is hermetically fixed on the second G10 sample framework 7 by using low-temperature sealant, and the volume of the thermal insulation device 24 can completely cover the temperature measurement area of the fiber grating temperature sensor. In practical applications, the material and the shape and size of the heat insulation means may vary according to practical requirements. In order to prevent the heat insulation device 24 from directly contacting with the elements such as heating resistor adhered on the surface of the strip material, thereby damaging the sensing element, a groove 25 is opened on the heat insulation device 24. The experimental sample can be added to the entire circuit using the current lead connection terminals while also being fixed in a dedicated experimental dewar, thereby avoiding floating of the sample due to buoyancy of the heat insulating means 24. The experimental device shown in fig. 6 is connected into a circuit and soaked in liquid nitrogen, and then the quench characteristic research of the high-temperature superconducting tape based on the non-adhesive fiber grating temperature sensor can be carried out. The experimental test that the heating resistor produces the heat pulse under the condition that high temperature superconducting tape does not have the electric current at first of this embodiment, verifies the ability of temperature measurement of proposed method in liquid nitrogen warm area, then has carried out the heat pulse when leading through not equidimension transmission current in the high temperature superconducting tape and has triggered the quench test and the quench test under the overcurrent condition and verify the validity of the utility model that provides.
Example 8:
as shown in fig. 8, which is the result of the heating resistance heat pulse triggering test at the liquid nitrogen temperature of 77K, it can be seen that the wavelengths of all the fiber grating temperature sensors are at the same starting point and are stabilized at 77K before the heat pulse is applied. With the increase of the heat pulse, the FBG15 which is at the same vertical position with the heating resistor firstly responds rapidly, and then the adjacent fiber bragg grating temperature sensors respond in sequence, which indicates that the temperature is symmetrically propagated from the heating resistor to two ends, and shows the capability and effectiveness of the temperature measurement of the proposed method in the liquid nitrogen temperature zone 77K.
Example 9:
as shown in fig. 9, for the test result of the quench test triggered by the heat pulse when the transmission current is 0.5 times the critical current, all the fiber bragg grating temperature sensors are stable at one point, which indicates that the temperature has no obvious fluctuation, and as the heat pulse is applied, the FBG15 which is at the same vertical position as the heating resistor first responds quickly, and then the adjacent fiber bragg grating temperature sensors respond sequentially, indicating that the temperature is spread symmetrically from the heating resistor to both ends. In addition, due to the existence of the transmission current, along with the rise of the temperature at the heating resistor, the high-temperature superconducting strip gradually generates a voltage signal, namely a quench signal, and the intersection point of a dotted line 1 and a dotted line 2 in the figure is the wavelength corresponding to the sample voltage reaching the critical current criterion of 1 muv/cm. The method has stable temperature measurement capability at 77K, can capture the whole process of quenching caused by the temperature rise signal generated by the heating resistor and the sample voltage signal, and can be used for research work such as measurement of shunt temperature of the high-temperature superconducting tape.
Example 10:
to verify that the proposed method can capture quench signals of any form, the present embodiment performs a test of slowly increasing the sample transmission current until a critical current is reached and then an unrecoverable quench signal occurs. As shown in fig. 10, as a result of the quench test under the overcurrent condition, before the transmission current reaches the critical current value of 212.7A, all the fiber bragg grating temperature sensors have no obvious fluctuation, and after the transmission current reaches 212.7A, the sample voltage signal reaches the criterion of the critical current of 1 μ v/cm, and the fiber bragg grating temperature sensors also have a slight rising signal. Continuing to increase the current to 225A, all the fiber grating temperature sensors and sample voltage signals had jumped to the off-segment power source, indicating the occurrence of an unrecoverable quench. It can be seen that in the whole over-current test, the trends of the fiber bragg grating temperature sensor and the sample voltage are consistent, and a quench signal caused by over-current can be captured.
As shown in fig. 11, the spectrum of the fiber grating temperature sensor taken out of the sample skeleton after the experiment is at room temperature, and the result shows that the spectral response of all the fiber grating temperature sensors taken out of the sample skeleton after the experiment is completed is good, that is, the fiber grating temperature sensors are not damaged in the experiment, and the proposed non-bonded fiber grating temperature sensor for the quench characteristic study of the high-temperature superconducting tape can be reused.
Claims (4)
1. The high-temperature superconductor temperature monitoring device is characterized in that: the temperature monitoring device comprises a fiber bragg grating temperature sensor (3), wherein the fiber bragg grating temperature sensor (3) is directly embedded into a sample framework of a high-temperature superconductor with temperature to be monitored; the magnet coil framework (1) is in rigid contact with the high-temperature superconducting magnet coil (2) and is fixed by epoxy resin glue;
the fiber bragg grating temperature sensor (3) is packaged in the protective sleeve and protects the fiber bragg grating temperature sensor (3);
the protective sleeve adopts a capillary tube with high thermal conductivity.
2. The high temperature superconductor temperature monitoring device of claim 1, wherein: the fiber grating temperature sensor (3) is coated with a fiber grating temperature sensor with a large thermal expansion coefficient material, and the temperature sensitivity of the coated fiber grating temperature sensor is ensured to meet the temperature measurement requirement in a liquid nitrogen temperature operation area.
3. The high temperature superconductor temperature monitoring device of claim 1, wherein: the inner diameter of the capillary tube is matched with the outer diameter of the optical fiber of the fiber bragg grating temperature sensor (3).
4. The high temperature superconductor temperature monitoring device of claim 1, wherein: the high-temperature superconductor with the temperature to be monitored comprises a high-temperature superconducting magnet and a high-temperature superconducting tape.
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| CN115978444A (en) * | 2023-03-21 | 2023-04-18 | 北京中科富海低温科技有限公司 | Low-temperature transmission system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115978444A (en) * | 2023-03-21 | 2023-04-18 | 北京中科富海低温科技有限公司 | Low-temperature transmission system |
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