Continuous nondestructive testing device for local defects of superconducting cable

Abstract

The invention discloses a continuous nondestructive testing device for local defects of a superconducting cable. The continuous nondestructive testing device is characterized in that a pay-off wheel and a take-up wheel are respectively arranged above the left and right sides of a Dewar, the shaft of the pay-off wheel is connected with a damper, and the shaft of the take-up wheel is connected witha stepping motor; the Dewar is internally provided with a guide wheel, excitation coils, a magnetic field detector and a guide wheel 2 from left to right; the magnetic field detector is a square Hallsensor array consisting of four rows, i.e., a front row, a rear row, an upper row and a lower row, of Hall sensors; after a superconducting cable on the pay-off wheel extends out, the superconductingcable bypasses the guide wheel I, then successively passes through the centers of the excitation coils and the magnetic field detectors, then bypasses the guide wheel 2, and is finally wound around the take-up wheel. The continuous nondestructive testing device can realize continuous nondestructive detection of the local defects of the superconducting cable, so reliable test data is provided for the formulation of a cable stranding process for the superconducting cable and the use and maintenance of the superconducting cable; and thus, the performance and reliability of a superconducting magnet are guaranteed.

Description

Technical field [0001] The invention relates to a detection device for a superconducting cable. Background technique [0002] Large superconducting magnets can provide a strong magnetic field in a large space without consuming electricity, and have been widely used in high-energy ion accelerators, nuclear fusion, and magnetic fluid power generation. Superconducting magnets are mainly composed of Cable-in-Conduit Conductor (CICC) winding. The cable conductor in the tube is composed of a superconducting cable formed by multi-stage twisting of superconducting strands, a central cooling hole and an outer tube. Among them, the performance of the superconducting cable directly determines whether the prepared magnet can operate normally and the strength of the magnetic field generated by the superconducting magnet. During the twisting process of the superconducting cable, the superconducting strands may be subjected to different degrees of stress, which will cause local defects in the...

AI Technical Summary

Problems solved by technology

As for the superconducting cable, because it is formed by multi-level twisting of superconducting strands, when the superconducting cable passes through the Hall sensor next to it continuously, the cross-section of the closest superconducting part is not the same, but a continuous torsion (rotation ) changes in a non-circular shape; therefore, the residual magnetic field continuously measured by the Hall sensor is not uniform, but will produce large fluctuations; thus it will cover up the residual magnetic field changes caused by local defects, and cannot detect the superconducting cable. local defect

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