阅读说明：本技术 一种超导带材动态温度测量方法及系统 (Method and system for measuring dynamic temperature of superconducting strip ) 是由 黑颖顿 周兴梅 陈伟 钱国超 于 2020-12-02 设计创作，主要内容包括：本申请属于超导材料温度测量技术领域,尤其涉及一种超导带材动态温度测量方法及系统。本申请的超导带材动态温度测量方法通过设置矩阵式温度测试监控单元和低温扫描霍尔探头,采集超导带材的温度分布场信号和磁场分布信号,通过用磁场分布信号去校准对齐温度分布场信号的时间维度,实现获取实时的温度分布场信号的技术目的。本申请利用低温扫描霍尔探头测量超导带材自发磁场值,判定超导带材是否发生失超,通过温度异常变化与磁场异常变化的时刻找到迟滞时间,从而在时间尺度上校准对齐温度分布场信号,最终得到实时的可定位的超导带材动态温度分布,能够有效克服温度传感器的测量时间延迟,具有误差小、效率高的优点。(The application belongs to the technical field of temperature measurement of superconducting materials, and particularly relates to a dynamic temperature measurement method and system for a superconducting tape. According to the dynamic temperature measuring method for the superconducting tape, the matrix type temperature testing monitoring unit and the low-temperature scanning Hall probe are arranged, the temperature distribution field signals and the magnetic field distribution signals of the superconducting tape are collected, the time dimension of aligning the temperature distribution field signals is calibrated by the magnetic field distribution signals, and the technical purpose of acquiring the real-time temperature distribution field signals is achieved. According to the method, the spontaneous magnetic field value of the superconducting tape is measured by the low-temperature scanning Hall probe, whether the superconducting tape is quenched or not is judged, and the delay time is found at the moment of abnormal temperature change and abnormal magnetic field change, so that the temperature distribution field signal is calibrated and aligned on a time scale, the real-time positionable dynamic temperature distribution of the superconducting tape is finally obtained, the measurement time delay of the temperature sensor can be effectively overcome, and the method has the advantages of small error and high efficiency.)

1. A method for measuring the dynamic temperature of a superconducting tape is characterized by comprising the following steps:

building a through-flow platform to enable the superconducting tape to be in a low-temperature environment and generate a spontaneous magnetic field;

arranging a matrix type temperature test monitoring unit for acquiring a temperature distribution field signal of the superconducting tape;

setting a low-temperature scanning Hall probe, and acquiring a magnetic field distribution signal of the superconducting tape by utilizing a Hall effect;

and analyzing to obtain the dynamic temperature distribution of the superconducting tape according to the obtained temperature distribution field signal and the obtained magnetic field distribution signal.

2. The method as claimed in claim 1, wherein the temperature sensors of the matrix-type temperature measurement and monitoring unit are connected in series by twisted pairs, and a plurality of twisted pairs are uniformly distributed and attached to the surface of the superconducting tape at a predetermined distance to collect the temperature distribution field signal of the superconducting tape.

3. The method according to claim 1, wherein the step of constructing a through-flow platform to allow the superconducting tape to be in a low temperature environment and generate a spontaneous magnetic field comprises:

two ends of the superconducting tape are connected with a current generating device through copper wires, the superconducting tape is immersed in liquid nitrogen, the superconducting tape is in a low-temperature environment lower than 200 ℃ below zero, the current generating device generates strong current, and meanwhile, the superconducting tape generates a spontaneous magnetic field.

4. The method of claim 1, wherein the step of setting the low temperature scanning hall probe to obtain the magnetic field distribution signal of the superconducting tape by using the hall effect comprises:

the low-temperature scanning Hall probe is arranged below the superconducting tape and used for detecting and acquiring a magnetic field distribution signal of the superconducting tape.

5. The method of claim 1, wherein the step of analyzing the dynamic temperature distribution of the superconducting tape based on the obtained temperature distribution field signal and the obtained magnetic field distribution signal comprises:

the computer sends an acquisition instruction to the inspection host, the inspection host forwards the acquisition instruction to each extension, each extension drives the matrix temperature test monitoring unit and the low-temperature scanning Hall probe to continuously acquire temperature signals and magnetic field signals according to the acquisition instruction, the acquired temperature signals and magnetic field signals are transmitted back to the inspection host, the inspection host uploads the temperature signals and magnetic field signals to the computer, the computer stores, displays and processes the received data in real time, and finally the computer performs preset operation according to the processing and analyzing result.

6. A method for dynamically measuring temperature of a superconducting tape according to claim 1, wherein in the step of analyzing the dynamic temperature distribution of the superconducting tape based on the obtained temperature distribution field signal and magnetic field distribution signal, the analyzing comprises:

if the magnetic flux density of the superconducting tape changes at a certain moment, the superconducting tape is judged to be in a quench state, the computer calculates the lag time T-Tc of the matrix type temperature test monitoring unit according to the fastest abnormal change moment T of the temperature rise in the temperature distribution field signal and the abnormal change moment Tc of the magnetic field in the magnetic field distribution signal, and the thermal distribution field information of the superconducting tape is calibrated and aligned on the time scale to obtain the real-time dynamic temperature distribution of the positionable superconducting tape.

7. The method according to claim 3, wherein said strong current is a direct current or an alternating current having a critical current of 2000A or less and larger than that of said superconducting tape.

8. The method as claimed in claim 1, wherein a platinum thermistor temperature sensor is used in the matrix-type temperature test monitoring unit.

9. A superconducting tape dynamic temperature measurement system, comprising:

the through-flow platform is used for enabling the superconducting strip to be in a low-temperature environment and generating a spontaneous magnetic field;

the matrix type temperature test monitoring unit is used for acquiring a temperature distribution field signal of the superconducting tape;

the low-temperature scanning Hall probe is used for acquiring a magnetic field distribution signal of the superconducting tape by utilizing a Hall effect;

and the computer is used for analyzing and obtaining the dynamic temperature distribution of the superconducting tape according to the obtained temperature distribution field signal and the obtained magnetic field distribution signal.

10. The superconducting tape dynamic temperature measurement system of claim 9, further comprising:

an insulating plate for fixing the superconducting tape thereon;

a foam box for housing the insulation plate and the superconducting tape.

Technical Field

The application relates to the technical field of temperature measurement of superconducting materials, in particular to a dynamic temperature measurement method and system for a superconducting tape.

Background

In recent years, research on various properties of superconducting materials has been a relatively hot issue, and in particular, in terms of quench properties of superconducting tapes, research in the industry has been focused on the superconducting tapes due to their great value in industrial applications.

When the superconducting equipment is in operation and quench, the current capacity can be reduced, and irreversible damage can be caused if no measures are taken, so that the monitoring and the protection of the superconducting equipment during the operation are particularly important. The change in physical properties of the superconducting tape upon quench is manifested in various aspects, such as temperature, current, and magnetic field. According to the temperature characteristics of the superconducting tape and the change of the surrounding magnetic field, when the superconducting tape loses overtime, hot spots are locally generated to cause local temperature rise, and dynamic temperature measurement can be carried out by arranging a matrix type temperature testing and monitoring system on the superconducting tape so as to position the point of failure.

However, experiments have shown that when the measured temperature changes suddenly, the output of the temperature sensor is delayed for a period of time, which is commonly referred to as a pure lag or delay. When the temperature of the superconducting tape is measured, if the time constant and the lag of the temperature sensor are not corrected, the measured result is deviated, and the quench time and the quench part of the superconducting tape cannot be accurately judged. Therefore, a method and a system for measuring the dynamic temperature of the superconducting tape without pure time delay are needed to solve the technical problem of time delay misalignment in the measurement of the dynamic temperature of the superconducting tape.

Disclosure of Invention

The application provides a method and a system for measuring the dynamic temperature of a superconducting tape, which are used for solving the problem of pure time delay calibration in the current superconducting tape temperature measurement.

The technical scheme adopted by the application is as follows:

in a first aspect of the present application, there is provided a method for measuring a dynamic temperature of a superconducting tape, comprising the steps of:

building a through-flow platform to enable the superconducting tape to be in a low-temperature environment and generate a spontaneous magnetic field;

arranging a matrix type temperature test monitoring unit for acquiring a temperature distribution field signal of the superconducting tape;

setting a low-temperature scanning Hall probe, and acquiring a magnetic field distribution signal of the superconducting tape by utilizing a Hall effect;

and analyzing to obtain the dynamic temperature distribution of the superconducting tape according to the obtained temperature distribution field signal and the obtained magnetic field distribution signal.

Optionally, the temperature sensors in the matrix temperature test monitoring unit are connected in series by twisted pairs, and a plurality of twisted pairs are uniformly distributed and attached to the surface of the superconducting tape according to a preset distance to collect a temperature distribution field signal of the superconducting tape.

Optionally, the step of constructing the through-flow platform to make the superconducting tape in a low-temperature environment and generate a spontaneous magnetic field includes:

two ends of the superconducting tape are connected with a current generating device through copper wires, the superconducting tape is immersed in liquid nitrogen, the superconducting tape is in a low-temperature environment lower than 200 ℃ below zero, the current generating device generates strong current, and meanwhile, the superconducting tape generates a spontaneous magnetic field.

Optionally, the step of setting the low-temperature scanning hall probe and obtaining the magnetic field distribution signal of the superconducting tape by using the hall effect includes:

the low-temperature scanning Hall probe is arranged below the superconducting tape and used for detecting and acquiring a magnetic field distribution signal of the superconducting tape.

Optionally, in the step of analyzing and obtaining the dynamic temperature distribution of the superconducting tape according to the obtained temperature distribution field signal and the obtained magnetic field distribution signal, the method includes:

the computer sends an acquisition instruction to the inspection host, the inspection host forwards the acquisition instruction to each extension, each extension drives the matrix temperature test monitoring unit and the low-temperature scanning Hall probe to continuously acquire temperature signals and magnetic field signals according to the acquisition instruction, the acquired temperature signals and magnetic field signals are transmitted back to the inspection host, the inspection host uploads the temperature signals and magnetic field signals to the computer, the computer stores, displays and processes the received data in real time, and finally the computer performs preset operation according to the processing and analyzing result.

Optionally, in the step of analyzing and obtaining the dynamic temperature distribution of the superconducting tape according to the obtained temperature distribution field signal and the obtained magnetic field distribution signal, the analyzing process includes:

if the magnetic flux density of the superconducting tape changes at a certain moment, the superconducting tape is judged to be in a quench state, the computer calculates the lag time T-Tc of the matrix type temperature test monitoring unit according to the fastest abnormal change moment T of the temperature rise in the temperature distribution field signal and the abnormal change moment Tc of the magnetic field in the magnetic field distribution signal, and the thermal distribution field information of the superconducting tape is calibrated and aligned on the time scale to obtain the real-time dynamic temperature distribution of the positionable superconducting tape.

Optionally, the strong current is a direct current or an alternating current with a critical current greater than or equal to 2000 amperes of the superconducting tape.

Optionally, a platinum thermistor temperature sensor is adopted in the matrix temperature test monitoring unit.

In another aspect of the present application, there is provided a superconducting tape dynamic temperature measurement system comprising:

the through-flow platform is used for enabling the superconducting strip to be in a low-temperature environment and generating a spontaneous magnetic field;

the matrix type temperature test monitoring unit is used for acquiring a temperature distribution field signal of the superconducting tape;

the low-temperature scanning Hall probe is used for acquiring a magnetic field distribution signal of the superconducting tape by utilizing a Hall effect;

and the computer is used for analyzing and obtaining the dynamic temperature distribution of the superconducting tape according to the obtained temperature distribution field signal and the obtained magnetic field distribution signal.

Optionally, the method further includes:

an insulating plate for fixing the superconducting tape thereon;

a foam box for housing the insulation plate and the superconducting tape.

The technical scheme of the application has the following beneficial effects:

the technical purpose of acquiring real-time temperature distribution field signals is achieved by arranging a matrix type temperature test monitoring unit and a low-temperature scanning Hall probe, acquiring temperature distribution field signals and magnetic field distribution signals of a superconducting strip and calibrating and aligning the time dimension of the temperature distribution field signals by using the magnetic field distribution signals. The measuring point with the local temperature rise in the temperature distribution field signal of the superconducting tape is judged as the point of failure in overtaking, and the measuring result obtained by the method can be used for positioning the point of failure in overtaking of the superconducting tape.

The superconducting tape spontaneous magnetic field value is measured by the low-temperature scanning Hall probe while the superconducting tape flows through the flow, whether the superconducting tape is quenched or not is judged according to the magnetic field distribution condition of the superconducting tape, and the delay time is found at the moment of abnormal temperature change and abnormal magnetic field change when the superconducting tape is quenched, so that the measurement result of the temperature sensor of the alignment matrix type temperature test monitoring unit is calibrated on a time scale, real-time positionable dynamic temperature distribution of the superconducting tape is finally obtained, the measurement time delay of the temperature sensor can be effectively overcome, and the superconducting tape spontaneous magnetic field value measuring device has the advantages of small error and high efficiency.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of the present application;

illustration of the drawings:

the device comprises a 1-through flow platform, a 2-superconducting strip, a 3-matrix temperature test monitoring unit and a 4-low temperature scanning Hall probe.

Detailed Description

Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.

In a first aspect of the present application, there is provided a method for measuring a dynamic temperature of a superconducting tape 2, comprising the steps of:

building a through-flow platform 1 to enable the superconducting strip 2 to be in a low-temperature environment and generate a spontaneous magnetic field;

arranging a matrix type temperature test monitoring unit 3 for acquiring a temperature distribution field signal of the superconducting tape 2;

setting a low-temperature scanning Hall probe 4, and acquiring a magnetic field distribution signal of the superconducting tape 2 by utilizing a Hall effect;

the dynamic temperature distribution of the superconducting tape 2 is analyzed and obtained according to the obtained temperature distribution field signal and the obtained magnetic field distribution signal.

As shown in fig. 1, the matrix temperature measurement monitoring unit 3 in this embodiment is attached to the upper surface of the superconducting tape 2. Matrix temperature test monitoring unit 3, exemplarily adopt platinum resistance temperature sensor, utilize the principle that platinum resistance value changes along with the change of temperature, insert four pins of platinum resistance into the universal meter, apply a method of known excitation current measurement its both ends voltage to platinum resistance through the universal meter and obtain the resistance value, resistance-temperature corresponding relation in the national standard has been set up in the universal meter, can convert into the temperature value by the resistance value, thereby realize temperature measurement, platinum resistance temperature sensor's temperature signal line adopts the four-wire system to carry out the wiring, draw forth the four-wire from platinum resistance both ends, circuit loop and measurement circuit independently separate the wiring during the wiring, in order to improve measurement accuracy, its temperature matrix expression is:

the low-temperature scanning Hall probe 4 is arranged below the superconducting tape 2, the low-temperature scanning Hall probe 4 utilizes the principle of Hall effect, the superconducting current density is a function of the position of the superconducting tape 2 and the magnetic flux density, and the magnetic flux change can be observed through continuous scanning by measuring the spontaneous magnetic field value according to the Biot-Saval law. Once quench occurs, the magnetic flux density changes due to the change of the superconducting current density, the lag time of the temperature distribution field signal can be obtained by comparing the abnormal time of the magnetic field distribution signal with the abnormal time of the temperature distribution field signal, and the temperature distribution field signal is subjected to time alignment calibration according to the lag time to obtain a real-time temperature distribution field signal.

Optionally, the temperature sensors in the matrix temperature testing and monitoring unit 3 are serially connected by twisted-pair lines, and a plurality of twisted-pair lines are uniformly distributed and attached to the surface of the superconducting tape 2 according to a preset distance to collect the temperature distribution field signal of the superconducting tape 2.

Optionally, the step of constructing the through-flow platform 1 to make the superconducting tape 2 in a low-temperature environment and generate a spontaneous magnetic field includes:

two ends of the superconducting tape 2 are connected with a current generating device through copper wires, the superconducting tape 2 is immersed in liquid nitrogen, the superconducting tape 2 is in a low-temperature environment lower than 200 ℃ below zero, the current generating device generates strong current, and meanwhile the superconducting tape 2 generates a spontaneous magnetic field.

Optionally, the step of setting the low-temperature scanning hall probe 4 and obtaining the magnetic field distribution signal of the superconducting tape 2 by using the hall effect includes:

the low-temperature scanning Hall probe 4 is arranged below the superconducting tape 2 and is used for detecting and acquiring a magnetic field distribution signal of the superconducting tape 2.

Optionally, in the step of analyzing and obtaining the dynamic temperature distribution of the superconducting tape 2 according to the obtained temperature distribution field signal and the obtained magnetic field distribution signal, the method includes:

the computer sends an acquisition instruction to the inspection host, the inspection host forwards the acquisition instruction to the extension sets, the extension sets drive the matrix type temperature test monitoring unit 3 and the low-temperature scanning Hall probe 4 to continuously acquire temperature signals and magnetic field signals according to the acquisition instruction, the acquired temperature signals and magnetic field signals are transmitted back to the inspection host, the inspection host uploads the temperature signals and magnetic field signals to the computer, the computer stores, displays and processes the received data in real time, and finally the computer performs preset operation according to the processing and analyzing result.

Optionally, in the step of analyzing and obtaining the dynamic temperature distribution of the superconducting tape 2 according to the obtained temperature distribution field signal and the obtained magnetic field distribution signal, the analyzing process includes:

if the magnetic flux density of the superconducting tape 2 changes at a certain moment, the superconducting tape 2 is judged to be in a quench state, the computer calculates the lag time T-Tc of the matrix temperature test monitoring unit 3 according to the fastest abnormal change moment T of temperature rise in the temperature distribution field signal and the abnormal change moment Tc of the magnetic field in the magnetic field distribution signal, and the thermal distribution field information of the superconducting tape 2 is calibrated and aligned on a time scale to obtain the real-time dynamic temperature distribution of the positionable superconducting tape 2.

Optionally, the strong current is a direct current or an alternating current with a critical current greater than or equal to 2000 amperes of the superconducting tape 2.

In this embodiment, the strong current is a conventional word commonly used in experiments in the field, and its essential meaning is relative, i.e. relative to the properties of the superconducting material used in the experiments and the experimental conditions; in general, the current is equal to or higher than the critical current of the superconducting tape 2 but lower than a certain value. The application of a strong current to the superconducting tape 2 causes the superconducting tape 2 to lose its superconducting properties. In this embodiment, the strong current is defined as a direct current or an alternating current greater than the critical current of the superconducting tape 2 by 2000 amperes or less, and plays a guiding role in the effectiveness of the experiment.

Optionally, a platinum thermistor temperature sensor is adopted in the matrix temperature test monitoring unit 3.

In another aspect of the present application, there is provided a superconducting tape 2 dynamic temperature measurement system comprising:

the through-flow platform 1 is used for enabling the superconducting strip 2 to be in a low-temperature environment and generating a spontaneous magnetic field;

the matrix type temperature test monitoring unit 3 is used for acquiring a temperature distribution field signal of the superconducting tape 2;

the low-temperature scanning Hall probe 4 is used for acquiring a magnetic field distribution signal of the superconducting tape 2 by utilizing a Hall effect;

and the computer is used for analyzing and obtaining the dynamic temperature distribution of the superconducting tape 2 according to the obtained temperature distribution field signal and the obtained magnetic field distribution signal.

Optionally, the method further includes:

an insulating plate for fixing the superconducting tape 2 thereon;

a foam box for housing the insulating plate and the superconducting tape 2.

In the embodiment, an insulating plate is arranged at the bottom of a foam box body with an upward opening, a superconducting tape 2 is fixed on the insulating plate, and two ends of the superconducting tape 2 are connected with a current generating device through a copper wire to obtain a through-flow platform 1, so that the superconducting tape 2 generates a spontaneous magnetic field; injecting liquid nitrogen for immersing the superconducting tape 2 into the foam box body, so that the superconducting tape 2 is in a low-temperature environment of 200 ℃ below zero; installing a matrix type temperature test monitoring unit 3 on the upper surface of the superconducting tape 2, and collecting the temperature distribution field of the superconducting tape 2 in a matrix type multi-point mode; the low-temperature scanning Hall probe 4 is arranged below the superconducting tape 2, and the magnetic field distribution of the superconducting tape 2 is detected. The arrangement of the insulating plate and the foam box is beneficial to efficiently building the through-flow platform 1 and simultaneously beneficial to the measurement stability and accuracy of the dynamic temperature measurement system of the superconducting tape 2.

This application is through setting up matrix temperature test monitoring unit 3 and low temperature scanning hall probe 4, gathers superconducting tape 2's temperature distribution field signal and magnetic field distribution signal, through removing the time dimension of alignment temperature distribution field signal with magnetic field distribution signal, realizes the technical purpose who obtains real-time temperature distribution field signal. By judging the measuring point with the local temperature rise in the temperature distribution field signal of the superconducting tape 2 as the point of failure, the measuring result obtained by the method can be used for positioning the point of failure of the superconducting tape 2.

According to the method, the spontaneous magnetic field value of the superconducting tape 2 is measured by the low-temperature scanning Hall probe 4 while the superconducting tape flows through, whether the superconducting tape 2 is subjected to quench or not is judged according to the magnetic field distribution condition of the superconducting tape 2, the delay time is found at the moment of abnormal temperature change and abnormal magnetic field change, the measurement result of the temperature sensor of the alignment matrix type temperature test monitoring unit 3 is calibrated on a time scale, the real-time positionable dynamic temperature distribution of the superconducting tape 2 is finally obtained, the measurement time delay of the temperature sensor can be effectively overcome, and the method has the advantages of small error and high efficiency.

The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.