A method for dynamic temperature measurement of superconducting tape based on magnetic microscopy

Abstract

This application discloses a method for measuring the dynamic temperature of a superconducting strip based on magnetic microscopy, which includes the following steps: building a flow-through platform to make the superconducting strip generate a spontaneous magnetic field; configuring a temperature sensor to collect the heat of the superconducting strip; Distribution field; configure low-temperature scanning Hall probes to detect the magnetic field distribution of superconducting strips; acquire and analyze the thermal distribution field and magnetic field distribution signals in real time to obtain the dynamic temperature distribution of superconducting strips. The invention adopts multi-point temperature sensors on the superconducting strip to realize the distribution measurement of its temperature, uses a low-temperature scanning Hall probe to detect the abnormal change of the magnetic field distribution, and captures the quench point of the superconducting strip. While passing the current, the low-temperature scanning Hall probe is used to measure the spontaneous magnetic field value. When the superconducting strip is quenched, the lag time is found through the time of abnormal temperature and magnetic field changes, so as to achieve calibration on the time scale and finally obtain the actual Positionable dynamic temperature distribution of superconducting strips with small error and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of temperature measurement of superconducting strips, and relates to a method for measuring the dynamic temperature of superconducting strips based on magnetic microscopy. Background technique [0002] During the operation of superconducting equipment, once a quench occurs, the flow capacity will decrease, and if no measures are taken, it will cause irreversible damage. Therefore, monitoring and protection of the equipment during operation is particularly important. The physical properties of superconducting strips will change in many aspects during quenching, including temperature, current and magnetic field. According to the temperature characteristics of the superconducting strip and the change of the surrounding magnetic field, when the superconducting strip is quenched, hot spots will be generated locally, resulting in local temperature rise. Multiple temperature sensors can be arranged on the supercond...

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Problems solved by technology

[0003] However, experiments have proved that when the measured temperature changes suddenly, the output of the temperature sensor will be delayed for a period of time. This period is generally called pure lag or pure time delay.

When measuring the temperature of the superconducting strip, if the time constant and hysteresis of the temperature sensor are not corrected, the measurement results will be deviated

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