Dynamic temperature measurement and nonlinear temperature gradient temperature control method for superconducting material coating area

Abstract

The invention provides a superconducting material coating area dynamic temperature measuring device and a temperature measuring and controlling method. The superconducting material coating area dynamic temperature measuring device comprises a fixing part, a temperature measuring part and a driving part. The fixing part is used for fixing the whole device and is provided with a preset limiting opening for limiting a temperature measuring position; the number of the temperature measuring component is one, and the temperature measuring component comprises a thermocouple. The driving part comprises a vacuum isolation transmission device and is used for driving the temperature measuring part to change the position in a high-vacuum-degree environment, and the temperature measuring part is in contact with a measured object in the direction perpendicular to / parallel to the tape walking direction of the superconducting material and measures the temperature of the measured object at the corresponding position in the film coating area; the measured object comprises a superconducting material or a heating substrate of a coating area. According to the invention, large-range, high-fineness and high-consistency temperature gradient scanning can be realized, so that high-fineness temperature control is realized.

Description

[0001] This application is a divisional application of the following patent application:

[0002] Application number: CN202510686124.8

[0003] Application date: 2025-05-27

[0004] Application Name: Dynamic temperature measurement device and temperature measurement and control method for superconducting material coating area Technical Field

[0005] The present invention relates to the field of superconducting materials, and in particular to a dynamic temperature measuring device and a temperature measuring and controlling method for a superconducting material coating area. Background Art

[0006] This application specification uses PLD (Pulsed Laser Deposition) to deposit a REBCO film as an example for description, but this application is not limited to REBCO as a superconducting material or PLD as a method.

[0007] Deposition temperature is one of the most critical parameters in the superconducting layer process. The temperature range for REBCO thin film growth is very narrow, typically only 20°C. Traditional superconducting coating temperature measurement devices often use a static embedded temperature measurement structure. Multiple thermocouples are embedded in groups within the substrate, enabling temperature monitoring across the entire coating area. However, this embedded structure makes it difficult to ensure consistent assembly positioning during maintenance and assembly / unassembly, resulting in temperature discrepancies between multiple measurements. Static embedded temperature measurement is also prone to poor thermal contact after deformation at high temperatures, compromising measurement accuracy. Furthermore, due to the long-term high-temperature operating environment, thermocouples have a short service life and are prone to temperature drift in their later life, impacting measurement quality. A common problem with static embedded temperature measurement in production is that a thermocouple, due to aging, suddenly measures temperatures hundreds of degrees lower, leading to localized temperature control failure. Alternatively, after replacing a new thermocouple, different thermocouples measuring the same object may experience a temperature difference of 50°C, far exceeding the ±5°C tolerance required for high-quality coatings. These problems of inconsistent temperature measurement and poor reliability caused by traditional static embedded temperature measurement seriously affect the high-quality plating of superconducting materials, resulting in a large number of defective products.

[0008] In addition to the above test stability issues, the biggest problem with static embedded temperature measurement is: 1. Since the thermocouple is buried inside the substrate, there is often a significant difference between the measured temperature and the actual substrate surface and superconducting tape surface temperature. 2. It is unable to provide more precise temperature gradient data. In actual superconducting production applications, superconducting tapes are coated in a reciprocating manner with multiple coating passes. There are significant differences in the film thickness and coating rate of the tape after each coating pass. Because the thicker the superconducting film layer, the less heat is dissipated by surface radiation, and the surface temperature will be higher than that of a thinner superconducting film layer. Therefore, it is necessary to adjust the temperature of each pass according to the thickness of the superconducting film layer, reduce the deposition temperature of the thicker film layer and increase the deposition temperature of the thinner film layer, that is, a temperature gradient needs to be set between passes. On the other hand, to improve coating quality, a coating pass undergoes a cycle of rapid heating, slow heating, slow cooling, slow heating, and finally rapid cooling. This dynamic process ensures that the strip surface temperature remains within ±5°C of the optimal coating temperature for that pass, which is set based on the superconducting film thickness. In other words, within the same coating pass, a specific temperature gradient must be established along the strip's direction of motion to achieve high-quality coating. Because static embedded temperature measurement relies on thermocouples embedded in various locations within the substrate to achieve wide-area temperature measurement, limited by their inherent size and substrate space, these placements can only be scattered and sparse, resulting in only discrete and sparse temperature point data. The high-precision temperature control requirements of superconducting coatings are no longer satisfied with such point data; instead, a precise temperature scan of the entire coating area is required, enabling highly precise temperature control. For these reasons, the development of a dynamic temperature measurement device and temperature control method for the superconducting material coating area is urgently needed to overcome the many drawbacks of existing static embedded temperature measurement methods.

[0009] Patent publication number CN114438468B discloses a heating device for superconducting film coating. In this patent, thermocouples are statically embedded within a roller-shaped heating plate. Due to space limitations, the device can only measure temperature at specific locations. This embedded approach makes it impossible to verify thermal contact between the thermocouples, leading to temperature drift and hindering the continuous and stable production of superconducting tape. Summary of the Invention

[0010] In view of the defects in the prior art, the purpose of the present invention is to provide a dynamic temperature measurement device and a temperature measurement and control method for a superconducting material coating area.

[0011] According to the present invention, a dynamic temperature measurement device for a superconducting material coating area includes: a fixing component, a temperature measurement component and a driving component;

[0012] The fixing component is used to fix the entire device and has a preset limit opening to limit the temperature measurement position;

[0013] The number of the temperature measuring component is one, comprising a thermocouple;

[0014] The driving component is used to drive the temperature measuring component to change its position in a high vacuum environment, contact the object to be measured in a direction perpendicular to / parallel to the running direction of the superconducting material, and measure the temperature of the object to be measured at a corresponding position in the coating area;

[0015] The object to be measured includes a superconducting material or a heating substrate in the coating area.

[0016] Furthermore, the fixing component includes: a temperature measuring limit plate and a mounting base;

[0017] The temperature measurement limit plate is connected to the mounting base, and a limit opening is provided on the temperature measurement limit plate to limit the temperature measurement position.

[0018] Furthermore, the limiting opening is composed of a plurality of mutually parallel first limiting holes;

[0019] The first limiting holes correspond to different temperature measurement positions in the coating area;

[0020] The intervals between the first limiting holes meet the temperature measurement point density required for temperature measurement.

[0021] Furthermore, the driving component includes:

[0022] Vacuum-insulated transmissions;

[0023] A screw rod, one end of which is rotatably connected to the fixed component and the other end of which is connected to the vacuum isolation transmission device via a vacuum adapter flange;

[0024] a manual adjustment wheel connected to the vacuum isolation transmission device and driving the screw to rotate through the vacuum isolation transmission device;

[0025] The thermocouple front and rear adjustment plate has a threaded hole, which is threadedly connected to the screw between the fixing component and the vacuum adapter flange through the threaded hole. The thermocouple front and rear adjustment plate is provided with a second limiting hole, and the first limiting hole and the second limiting hole have a one-to-one correspondence;

[0026] The left and right adjustment rods of the thermocouple are detachably connected to the second limiting hole along the vertical direction.

[0027] Furthermore, the temperature measuring component includes:

[0028] A thermocouple fixture, one end of which is connected to the left and right adjustment rods of the thermocouple, the thermocouple fixture having a fixing slot, and the other end of which is tilted upward / downward at a preset angle to facilitate contact with the object being measured;

[0029] A thermocouple is connected to the fixing groove, wherein the temperature measuring head of the thermocouple is exposed outside the fixing groove and can contact the surface of the object to be measured;

[0030] The left and right adjustment rods of the thermocouple adjust the temperature measurement height of the thermocouple by changing the fixed position along the vertical direction on the second limiting hole, thereby controlling the thermocouple to be in close contact with the object to be measured;

[0031] The thermocouple is bent at a specific angle, and the elastic restoring force generated drives the thermocouple to closely contact the object to be measured.

[0032] According to a method for dynamic temperature measurement and temperature control of a superconducting material coating area provided by the present invention, the following steps are performed using the dynamic temperature measurement device for a superconducting material coating area:

[0033] Step 1: Fixing the superconducting material coating area dynamic temperature measuring device at one side of the coating area in a preset spatial position relationship;

[0034] Step 2: Adjust the installation position of the temperature measuring component in a second limiting hole of the driving component, drive the temperature measuring component into the coating area through the driving component, and contact the surface of the object to be measured in a direction perpendicular to / parallel to the running direction of the superconducting material to obtain temperature data;

[0035] Connect the temperature measuring component to the next second limiting hole and adjust the installation position, and repeat the test to obtain temperature data, temperature gradient or temperature distribution data at multiple locations in the coating area;

[0036] Step 3: Compare the detected temperature data, temperature gradient or temperature distribution data with the preset target temperature data, target temperature gradient or target temperature distribution data, and adjust the temperature of the coating area based on the difference.

[0037] Furthermore, the temperature control method 1 is included:

[0038] Contact the surface of the object being tested perpendicular to the direction of superconducting material running, and obtain the temperature data of all coating passes at the same test position / the temperature gradient between all coating passes;

[0039] All coating passes are uniformly set to a certain optimal coating temperature, and based on the temperature control in step 3, a uniform temperature coating area with consistent temperature in each coating pass is obtained.

[0040] Furthermore, the second temperature control method is included:

[0041] Contact the surface of the object being tested perpendicular to the direction of superconducting material running, and obtain the temperature data of all coating passes at the same test position / the temperature gradient between all coating passes;

[0042] A linear temperature gradient is set between each coating pass, and based on the temperature control in step 3, a non-uniform temperature coating area with a linear temperature distribution of each coating pass is obtained.

[0043] Furthermore, the temperature control method three is included:

[0044] Contact the surface of the object being tested perpendicular to the direction of superconducting material running, and obtain the temperature data of all coating passes at the same test position / the temperature gradient between all coating passes;

[0045] A complex nonlinear temperature gradient is set based on the thickness of the superconducting film layer in each coating pass. Based on the temperature control in step 3, a non-uniform temperature coating area with complex nonlinear temperature distribution in each coating pass is obtained, and the coating quality is optimized.

[0046] Furthermore, the fourth temperature control method is included:

[0047] Contacting the surface of the object to be measured in parallel with the running direction of the superconducting material to obtain the temperature gradient along the running direction of the strip during a coating pass;

[0048] Around the optimal coating temperature of this pass, high, low and high temperature zones are set at intervals along the strip running direction and the temperature is controlled based on step 3. The temperature in the high temperature zone is slightly higher than the optimal coating temperature, and the temperature in the low temperature zone is slightly lower than the optimal coating temperature, so as to achieve stable temperature control during the dynamic high-speed running of the strip.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] 1. The present invention uses a single thermocouple to measure the temperature at different positions of the entire heating area, thereby avoiding the difference in temperature measurement data between the thermocouples caused by the application of multiple thermocouples in static temperature measurement, and improving the consistency of the temperature measurement data.

[0051] 2. The present invention avoids the thermocouple from being in a high-temperature environment for a long time by using dynamic temperature measurement, greatly prolongs the life of the thermocouple, and ensures the temperature measurement stability.

[0052] 3. The present invention greatly improves the temperature measurement accuracy by using thermocouples to directly contact the substrate surface and the superconducting tape surface, and truly measures the process temperature of the core coating area of ​​the superconducting coating.

[0053] 4. The present invention can achieve extremely fine temperature gradient scanning and temperature control by using thermocouples to dynamically measure temperature at multiple positions in the entire heating area.

[0054] 5. The present invention can achieve a uniform temperature superconducting coating area with consistent temperature in each coating pass, thereby solving the problem of large-scale temperature drift in traditional temperature measurement and temperature control, and improving the quality of superconducting coating.

[0055] 6. The present invention can achieve a non-uniform temperature coating area with linear temperature distribution in each coating pass, and the quality of the superconducting coating is better than that of the uniform temperature coating area, which is difficult to achieve with traditional temperature measurement and temperature control methods.

[0056] 7. The present invention can achieve a non-uniform temperature coating zone with complex nonlinear temperature distribution in each coating pass, and the temperature gradient setting between each coating pass is more scientific, and the quality of the superconducting coating is optimal, which is difficult to achieve with traditional temperature measurement and temperature control methods.

[0057] 8. The present invention can realize the setting of complex temperature zones along the strip running direction, and suppress the temperature drift during the high-speed dynamic movement of the superconducting strip, which is difficult to achieve with traditional temperature measurement and control methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0059] Figure 1 A schematic structural diagram of a dynamic temperature measurement device for a superconducting material coating area provided in an embodiment of this specification;

[0060] Figure 2 Schematic diagram of a superconducting material coating area dynamic temperature measurement device structure from other observation angles provided in an embodiment of this specification;

[0061] Figure 3 A schematic diagram of the spatial relationship between a dynamic temperature measurement device for a superconducting material coating area and the measured strip and substrate provided in an embodiment of this specification;

[0062] Figure 4 A flow chart of a method for dynamic temperature measurement and temperature control in a superconducting material coating area provided in an embodiment of this specification;

[0063] Figure 5 A schematic diagram of a superconducting material coating area dynamic temperature measurement device provided in an embodiment of this specification, which measures the temperature vertically along the strip running direction and shows ideal uniform temperature data;

[0064] Figure 6 Schematic diagram of a typical temperature drift problem in traditional static embedded temperature measurement provided in the embodiments of this specification;

[0065] Figure 7 Schematic diagram of a typical large-scale temperature drift problem of traditional static embedded temperature measurement provided in the embodiments of this specification;

[0066] Figure 8 A schematic diagram of a dynamic temperature measurement device and temperature control method for a superconducting material coating area provided in an embodiment of this specification to achieve dynamic temperature measurement on a channel-by-channel basis;

[0067] Figure 9A schematic diagram of a dynamic temperature measurement device and temperature control method for a superconducting material coating area provided in an embodiment of this specification for realizing dynamic temperature measurement and controlling temperature drift on a channel-by-channel basis;

[0068] Figure 10 A schematic diagram of a dynamic temperature measurement device and temperature control method for a superconducting material coating area provided in an embodiment of this specification for realizing dynamic temperature measurement and temperature control according to a specific temperature gradient;

[0069] Figure 11 The thickness data of the superconducting film layer for each coating pass provided in the embodiments of this specification and a schematic diagram showing the relationship between the superconducting film layer thickness and the deposition temperature;

[0070] Figure 12 A schematic diagram of a dynamic temperature measurement device and temperature control method for a superconducting material coating area provided in an embodiment of this specification, which realizes dynamic temperature measurement on a channel-by-channel basis and implements high-precision temperature gradient temperature control according to the thickness of the superconducting film layer;

[0071] Figure 13 A schematic diagram of a dynamic temperature measurement device and temperature control method for a superconducting material coating area provided in an embodiment of this specification for realizing dynamic temperature measurement along the strip running direction and temperature control according to a specific temperature gradient;

[0072] In the picture:

[0073] Temperature measuring limit plate 101; mounting base 102; first limit hole 103; thermocouple fixing device 201; thermocouple 202; thermocouple left and right adjustment rod 301; thermocouple front and rear adjustment plate 302; screw 303; vacuum adapter flange 304; vacuum isolation transmission device 305; manual adjustment wheel 306; second limit hole 307. DETAILED DESCRIPTION

[0074] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0075] like Figure 1 、 Figure 2 and Figure 3As shown, the present invention provides a dynamic temperature measurement device for a superconducting material coating area, comprising three parts: a fixing component 1, a temperature measuring component 2, and a driving component 3. The fixing component 1 is used to fix the entire device and has a preset limit opening to define the temperature measurement position. There is one temperature measuring component 2, which includes a thermocouple. The driving component 3 is used to drive the temperature measuring component 2 to change its position in a high vacuum environment, contact the object to be measured in a direction perpendicular or parallel to the superconducting material running direction, and measure the temperature of the object to be measured at the corresponding position in the coating area.

[0076] The fixing component 1 includes: a temperature measuring limit plate 101 and a mounting base 102. The temperature measuring limit plate 101 is connected to the mounting base 102 for fixing. The temperature measuring limit plate 101 is provided with a plurality of vertical first limit holes 103, corresponding to different detection positions in the coating area. The size of the first limit holes 103 depends on the geometric relationship between the temperature measuring component 2 and the object to be measured, such as Figure 2 、 3 As shown, the first limiting hole 103 is slightly wider than the width of the temperature measuring component 2 to facilitate its entry. The length of the first limiting hole 103 is sufficient to ensure that the temperature measuring component 2 can contact the surface of the object being measured by moving up and down within the first limiting hole 103. Furthermore, the arrangement density of the first limiting holes 103 depends on the required density of temperature measurement points.

[0077] The drive component 3 includes: a thermocouple left-right adjustment rod 301; a thermocouple front-back adjustment plate 302; a screw 303; a vacuum adapter flange 304; a vacuum-insulated transmission device 305; and a manual adjustment wheel 306. One end of the screw 303 is rotatably connected to the fixed component 1, and the other end is connected to the vacuum-insulated transmission device 305 via the vacuum adapter flange 304. The manual adjustment wheel 306 is connected to the vacuum-insulated transmission device 305, driving the screw 303 to rotate via the vacuum-insulated transmission device 305. The thermocouple front-back adjustment plate 302 has a threaded hole that is threadedly connected to the screw 303 between the fixed component 1 and the vacuum adapter flange 304. The thermocouple front-back adjustment plate 302 is provided with a plurality of parallel, vertically aligned second stop holes 307, each corresponding to the first stop holes 103. The thermocouple left-right adjustment rod 301 is detachably connected to the second stop holes 307 along the vertical direction. The adjustment action of the manual adjustment wheel 306 is transmitted to the screw 303 through the vacuum-insulated transmission device 305 with high vacuum sealing and the vacuum adapter flange 304, achieving in-situ circumferential rotation control of the screw 303 in a high vacuum environment. When the screw 303 performs this in-situ rotational motion, the thermocouple front and rear adjustment plates 302 also undergo associated back and forth movement. The drive component 3 can drive the temperature measurement component 2 through the first limiting hole 103, contacting the object to be measured in a direction perpendicular or parallel to the direction of the superconducting material, and measuring the temperature of the object to be measured at a corresponding position in the coating area. The object to be measured can be the superconducting material itself or the heated substrate in the coating area.

[0078] The thermocouple left and right adjustment rod 301 is connected and fixed in a vertical direction at the second limiting hole 307 on the thermocouple front and back adjustment plate 302 by bolts. The thermocouple left and right adjustment rod 301 adjusts the relative height of the thermocouple left and right adjustment rod 301 by changing the upper and lower positions of the fixing bolts in the second limiting hole 307 of the thermocouple front and back adjustment plate 302. The thermocouple left and right adjustment rod 301 is fixed to different second limiting holes 307 on the thermocouple front and back adjustment plate 302 to regulate its left and right position. The temperature measuring component 2 realizes three-dimensional position control capability by adjusting the front and back position of the thermocouple front and back adjustment plate 302, adjusting the left and right position of the thermocouple left and right adjustment rod 301, and adjusting the relative height of the thermocouple left and right adjustment rod 301 by changing the fixed position in the limiting hole of the thermocouple front and back adjustment plate 302.

[0079] There is one temperature measuring component 2, comprising a thermocouple fixture 201 and a thermocouple 202. One end of the thermocouple fixture 201 is connected to the thermocouple left / right adjustment rod 301. A fixing slot is defined along its length, and the other end is tilted upward or downward at a preset angle to facilitate contact with the object being measured. The thermocouple 202 is connected to the fixing slot, with its temperature probe exposed outside the slot, allowing contact with the surface of the object being measured.

[0080] The thermocouple 202 and the thermocouple fixing device 201 pass through the limiting holes of the temperature measuring limiting plate 101 at a certain angle. Based on the one-to-one correspondence between the limiting holes of the thermocouple front and rear adjustment plate 302 and the limiting holes of the temperature measuring limiting plate 101, the left and right positions of the thermocouple 202 are fixed to avoid position deviation during the temperature measurement process. The passing angle depends on the spatial geometric relationship between the object to be measured and the temperature measuring component, which facilitates close contact between the thermocouple and the object to be measured, such as Figure 3 shown.

[0081] like Figure 1 、 Figure 2 、 Figure 3As shown, in the embodiment provided by the present invention, during the measurement process, the thermocouple 202 is fixed in the groove of the thermocouple fixing device 201. Through the fixation of the thermocouple fixing device 201 and the motion transmission to the driving component 3, the temperature measurement position can be freely adjusted in three dimensions: front, back, up, down, and left. During the measurement process, the operator can rotate the manual adjustment wheel 306 to drive the transmission mechanism (generally a magnetic fluid sealing transmission device) in the vacuum isolation transmission device 305 through the vacuum adapter flange 304 to directly control the in-situ rotation of the screw rod 303. The in-situ rotation of the screw rod 303 drives the thermocouple front and back adjustment plate 302 to move forward and backward in a controlled manner through the gear engagement. The fixed position of the thermocouple left and right adjustment rod 301 and the thermocouple front and back adjustment plate 302 adjusts the left and right and up and down positions of the thermocouple 202 for temperature measurement, thereby realizing the temperature measurement position adjustment in the above-mentioned three dimensions of front, back, up, down, and left in a narrow space.

[0082] Since the non-embedded temperature measurement method is adopted, the good contact between the thermocouple 202 and the object to be measured or a specific position of the object to be measured can be visually observed, ensuring that the thermocouple 202 can accurately measure the temperature of the target position during the temperature measurement process. In addition, the thermocouple 202 can directly contact the surface of the measured strip or substrate, avoiding the temperature difference between the embedded thermocouple temperature measurement area and the target area. During the entire temperature measurement process, only one set of thermocouples is used to quickly complete the temperature measurement of all different positions, avoiding the introduction of a large number of thermocouples in the embedded temperature measurement, and the temperature drift caused by the different lifespans and states of the thermocouples (such as Figure 6 、 Figure 7 As shown), ensuring the consistency and reliability of test data (as shown Figure 5 After the temperature measurement process is completed, the thermocouple can be adjusted away from the high-temperature object by rotating the manual adjustment wheel, so that the thermocouple does not need to be in a high-temperature working environment for a long time, greatly extending the service life of the thermocouple.

[0083] Figure 4 This is a flow chart of a method for dynamic temperature measurement and temperature control of a superconducting material coating area provided in an embodiment of this specification. Figure 4 As shown, the method for dynamic temperature measurement and temperature control of the superconducting material coating area includes the following steps.

[0084] Step S1: Fix the superconducting material coating area dynamic temperature measuring device at one side of the coating area in a preset spatial position relationship.

[0085] The spatial position relationship is determined by the spatial distance and spatial angle between the temperature measuring limit plate 101 and the substrate or strip to be measured, ensuring that after installation, full coverage of the target temperature measurement area can be achieved by adjusting the manual adjustment wheel 306 and the thermocouple left and right adjustment rods 301.

[0086] In superconducting tape production applications, the temperature measurement position of the dynamic temperature measurement device described in the present invention is usually adjusted to ensure that the projection of the thermocouple 202 on the surface of the tape or substrate is perpendicular to the tape running direction or perpendicular to each tape run on the substrate surface. At the same time, the manual adjustment wheel 306 is rotated to make the temperature measuring thermocouple move back and forth, and the forward and backward movement range ensures that the thermocouple 202 can measure all tapes or tape runs; the left and right adjustment rods of the thermocouple are adjusted to make the thermocouple move left and right, and the direction of the left and right movement is parallel to the tape running direction or the substrate tape run; the relative height adjustment is achieved by adjusting the fixed position of the left and right adjustment rods in the limiting holes of the thermocouple front and rear adjustment plates. At the same time, the thermocouple 202 is bent at a specific angle, and the elastic restoring force generated drives the thermocouple to closely contact the object being measured. This ensures that the thermocouple can always be in close contact with the surface of the tape or substrate being measured during the temperature measurement process. In this way, full coverage of the target temperature measurement area is ensured.

[0087] The temperature measurement point density required for temperature measurement is met by setting the spacing between the limiting holes on the temperature measurement limiting plate 101. The smaller the spacing, the denser the temperature measurement points.

[0088] Step S2: Adjust the installation position of the temperature measuring component in a second limiting hole of the driving component, drive the temperature measuring component into the coating area through the driving component, and contact the surface of the object to be measured in a direction perpendicular / parallel to the running direction of the superconducting material to obtain temperature data; connect the temperature measuring component to the next second limiting hole and adjust the installation position, and repeat the detection to obtain temperature data, temperature gradient or temperature distribution data at multiple positions in the coating area.

[0089] In actual superconducting production applications, superconducting strips are coated in a reciprocating manner with multiple coating passes. The strip moves from the beginning of a coating pass to the end of the substrate, and then moves to the beginning of the next coating pass and then to the end of the next coating pass through the motion mechanism. This process continues until the strip passes through all coating passes and completes the superconducting coating. Therefore, special attention is paid to the temperature change data of the strip as it moves along the coating pass (such as Figure 13 ) or temperature gradient data between each coating pass (such as Figure 5 、 Figure 6 、 Figure 7 ) and temperature distribution data across the target coating area. Two temperature measurement paths are typically used: one is dynamic temperature measurement parallel to the strip travel direction for each coating pass, obtaining temperature gradient data along the strip travel direction for each coating pass; the other is dynamic temperature measurement perpendicular to the strip travel direction and across all coating passes, obtaining temperature gradient data between each coating pass. By changing the starting position of either path and repeating the above process multiple times, temperature distribution data across the target coating area can be obtained. This data can be used to guide subsequent temperature control processes.

[0090] Step S3: comparing the measured temperature data, temperature gradient or temperature distribution with the preset target temperature, target temperature gradient or distribution, and adjusting the temperature based on the difference.

[0091] Specifically, based on the temperature data of each coating pass, each coating pass is temperature-controlled based on the corresponding target temperature data (for example, uniformity control, controlling the temperature at different locations of each coating pass to be the same). Based on the temperature gradient between each coating pass, multiple coating passes are temperature-controlled based on the corresponding target temperature gradient. Based on the temperature gradient of each coating pass, each coating pass is temperature-controlled based on the corresponding target temperature gradient.

[0092] Repeat the above steps until the temperature difference is within the target range.

[0093] The target temperature gradient or target temperature distribution is preset based on practical experience in superconducting coating or certain scientific basis (such as superconducting film thickness), and can be further iterated and adjusted through repeated practice.

[0094] Temperature Control Example 1: Traditionally, the superconducting coating temperature zone needs to be more uniform and within the range of ±5°C of the optimal superconducting coating temperature. That is, during production, it is necessary to ensure that the temperature of each coating pass is consistent and within the range of ±5°C of the optimal superconducting coating temperature. However, due to factors such as the life span of each thermocouple, the degree of contact, and the distance between the temperature measurement area and the target area, the traditional static embedded temperature measurement system often causes the actual strip surface or each coating pass temperature to drift ( Figure 6 ) or even large-scale drift ( Figure 7 ). Applying the dynamic temperature measurement device of the present invention, after performing dynamic temperature measurement according to the above-mentioned path 2, the difference between the actual temperature gradient and the target temperature is obtained (such as Figure 8 ), and adjust the temperature repeatedly according to this difference, so as to ensure that the temperature of each coating pass is uniform and within the range of ±5℃ of the target temperature (such as Figure 9 ).

[0095] Temperature Control Example 2: Based on practical experience, it is found that setting a reasonable temperature gradient between each coating pass can improve the coating quality. Simply set the target temperature gradient with a linear temperature change (such as Figure 10 ), Figure 10 The target temperature gradient set in is: -0℃, -0℃, -3℃, -3℃, -6℃, -6℃, -9℃. Applying the dynamic temperature measurement device of the present invention, after performing dynamic temperature measurement according to the above-mentioned path 2, the difference between the actual temperature gradient and the target temperature gradient is obtained. The temperature is repeatedly adjusted according to this difference, and finally it can be ensured that the temperature of each coating pass can be distributed according to the target temperature gradient (such as Figure 10 ).

[0096] Temperature Control Example 3: Based on practical experience and scientific evidence, the target temperature gradient should be set according to the thickness of the superconducting film layer in each coating pass rather than a simple linear change (such as Figure 11 ). The target temperature gradient is set according to the thickness of the superconducting film layer in each coating pass and the thickness variation data of the superconducting film layer between adjacent coating passes. The target temperature of the pass with a large superconducting film layer thickness is set lower, and the target temperature of the pass with a small superconducting film layer thickness is set higher. The difference in the target temperature setting values ​​between adjacent coating passes needs to be proportional to the variation amplitude of the superconducting film layer thickness between adjacent passes. The difference in the target temperature setting values ​​between adjacent coating passes with a large thickness variation is larger, and vice versa. This complex temperature gradient setting cannot be obtained with a reasonable finite number of attempts, and the more coating passes there are, the more difficult it is to obtain. Figure 12 The target temperature gradients set in the example are: -0°C, -1°C, -3°C, -6°C, -9°C, -11°C, and -12°C. By applying the dynamic temperature measurement device of the present invention and performing dynamic temperature measurement according to the second path, the difference between the actual temperature gradient and the target temperature gradient is obtained. Based on this difference, the temperature is repeatedly adjusted, and finally the temperature of each coating pass can be distributed according to the target temperature gradient (e.g. Figure 12 ).

[0097] Temperature Control Example 4: In addition to the temperature gradient between coating passes perpendicular to the strip's travel direction, the temperature gradient along the strip's travel direction within each coating pass is equally important to coating quality. As the strip moves at high speed through the corresponding coating pass, it undergoes a rapid temperature increase, a small temperature increase, a small temperature decrease, a small temperature increase, and finally a rapid temperature decrease. This dynamic process ensures that the strip surface temperature remains within a ±5°C range of the optimal coating temperature for that coating pass, which is set based on the thickness of the superconducting film layer. Therefore, within a given coating pass, different high and low temperature zones are required along the strip's travel direction. The high and low temperature zones are set based on the optimal coating temperature determined by the thickness of the superconducting film layer for that coating pass, with the high temperature zone slightly above the optimal temperature and the low temperature zone slightly below it. These zones are generally arranged in a staggered pattern, ultimately defining the target temperature gradient along the strip's travel direction for that coating pass. The specific temperature settings and the placement of each zone depend on the strip's travel speed. By using the dynamic temperature measurement device of the present invention, after performing dynamic temperature measurement according to the above-mentioned path 1, the difference between the actual temperature gradient and the target temperature gradient is obtained, and the temperature is repeatedly adjusted according to this difference, and finally it is possible to ensure that the temperature of each coating pass can be distributed according to the target temperature gradient (such as Figure 13 ).

[0098] The dynamic temperature measurement device and temperature control method for the superconducting coating area described in this invention enable precise control of the superconducting coating temperature through large-scale, high-density, and highly consistent dynamic temperature gradient measurement, thereby improving the quality of the superconducting coating. Traditional embedded temperature measurement methods, however, are unable to achieve this large-scale, high-density, and highly consistent temperature gradient measurement due to limitations in embedded space, temperature drift, and measurement consistency, making it difficult to meet the aforementioned high-precision temperature control requirements.

[0099] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0100] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A method for dynamic temperature measurement and nonlinear temperature gradient control in a superconducting material coating area, characterized in that: A dynamic temperature measuring device for the superconducting material coating area is used, and the dynamic temperature measuring device for the superconducting material coating area includes: A fixing component (1), a temperature measuring component (2) and a driving component (3); The fixing component (1) is used to fix the entire device and has a preset limiting opening to limit the temperature measurement position; The number of the temperature measuring component (2) is one, comprising a thermocouple; The driving component (3) is used to drive the temperature measuring component (2) to change its position in a high vacuum environment, contact the object to be measured in a direction perpendicular to / parallel to the running direction of the superconducting material, and measure the temperature of the object to be measured at a corresponding position in the coating area; The object to be measured includes a superconducting material or a heating substrate of the coating area; The method for dynamic temperature measurement and temperature control of the superconducting material coating area includes: Step 1: Fixing the superconducting material coating area dynamic temperature measuring device at one side of the coating area in a preset spatial position relationship; Step 2: Adjust the installation position of the temperature measuring component in a second limiting hole of the driving component, drive the temperature measuring component into the coating area through the driving component, and contact the surface of the object to be measured in a direction perpendicular to / parallel to the running direction of the superconducting material to obtain temperature data; Connect the temperature measuring component to the next second limiting hole and adjust the installation position, and repeat the test to obtain temperature data, temperature gradient or temperature distribution data at multiple locations in the coating area; Step 3: comparing the detected temperature data, temperature gradient or temperature distribution data with the preset target temperature data, target temperature gradient or target temperature distribution data, and adjusting the temperature of the coating area based on the difference; The dynamic temperature measurement and temperature control method of the superconducting material coating area adopts the temperature control method three: Contact the surface of the object being tested perpendicular to the direction of superconducting material running, and obtain the temperature data of all coating passes at the same test position / the temperature gradient between all coating passes; The target temperature gradient is set according to the thickness of the superconducting film layer in each coating pass and the thickness variation data of the superconducting film layer between adjacent coating passes. The target temperature of the pass with thick superconducting film layer is set lower, and the target temperature of the pass with thin superconducting film layer is set higher. The difference in target temperature setting values ​​between adjacent coating passes is proportional to the variation in superconducting film thickness between adjacent passes. The larger the thickness variation, the greater the difference in target temperature setting values ​​between adjacent coating passes, and vice versa. A complex nonlinear temperature gradient is set based on the thickness of the superconducting film layer in each coating pass. Based on the temperature control in step 3, a non-uniform temperature coating area with complex nonlinear temperature distribution in each coating pass is obtained, and the coating quality is optimized.

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