Superconducting tape dynamic temperature measurement method based on magnetic microscopy method

Abstract

The invention discloses a superconducting tape dynamic temperature measurement method based on a magnetic microscopy method, and the method comprises the following steps: building a through-flow platform, and enabling a superconducting tape to generate a spontaneous magnetic field; configuring a temperature sensor, and collecting the heat distribution field of the superconducting tape; configuringa low-temperature scanning Hall probe to detect the magnetic field distribution of the superconducting tape; and acquiring and analyzing the thermal distribution field and magnetic field distributionsignals in real time to obtain the dynamic temperature distribution of the superconducting tape. The multi-distribution-point temperature sensors are adopted on the superconducting tape to achieve temperature distribution measurement, the low-temperature scanning Hall probe is used for detecting abnormal changes of magnetic field distribution, and quenching points of the superconducting tape arecaptured. A low-temperature scanning Hall probe is used for measuring a spontaneous magnetic field value while through-flow is carried out, and hysteresis time is found through time of temperature abnormal change and magnetic field abnormal change when the superconducting tape is out of time, so that calibration on a time scale is realized, and finally, actual locatable superconducting tape dynamic temperature distribution is obtained, and the method is small in error and high in 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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