Nondestructive measuring method for online measurement of pitch changes in superconducting cable during back-twist on basis of infrared thermal imaging
A technology of infrared thermal imaging and superconducting cable, which is applied in measurement devices, material thermal analysis, instruments, etc., can solve the problem that Sn conductor back-twist measurement cannot be detected online.
Inactive Publication Date: 2019-05-28
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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[0005] The purpose of the present invention is to provide a non-destructive measurement method for online measurement of superconducting cable backtwist angle based on infrared thermal imaging, to solve the problem of Nb in the prior art nuclear fusion device 3 The problem that the untwisting measurement of Sn conductor cannot be detected online
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[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0020] Such as figure 1 As shown, the non-destructive measurement method for online measurement of superconducting cable retraction angle based on infrared thermal imaging includes the following steps:
[0021] (1), Sampling: First, select a section of cable that has not been worn as a reference sample without twisting; Nb 3 During the cable forming process of the Sn conductor, due to the action of tensile stress and compressive stress, the untwisting rate of the cable will increase, so the Nb 3 The straight line segments at both ends of the Sn conductor are used as subsequent comparison samples. Such as figure 2 As shown in , the conductor mark at the front end is used as the first sample, and the Nb formed by the cable is selected at the same time 3 The two consecutive conductors at the rear end of the Sn conductor are respectively marked as the ...
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The invention discloses a nondestructive measuring method for online measurement of pitch changes in a superconducting cable during back-twist on the basis of infrared thermal imaging. Under the sameillumination condition, the pitch changes of the cable are measured by obtaining infrared pitch images between sub-cables, and then the back-twist angle of the cable is obtained through formula conversion. Under the condition that a conductor is not damaged, the pitch length and changes of the sub-cables are determined by measuring the sizes of infrared gap images between the sub-cables on a measuring negative film, and finally, the accurate value of the back-twist angle is calculated. The method has the advantages of being small in error and high in efficiency.
Description
technical field [0001] The invention relates to the field of conductor measurement methods for nuclear fusion devices, in particular to a non-destructive measurement method for online measurement of the backtwist angle of a superconducting cable based on infrared thermal imaging. Background technique [0002] Nb 3 Sn superconducting wires are widely used as in-tube cable conductors in high-field magnet systems, such as magnetic confinement fusion devices, high magnetic fields, accelerator magnets, etc., because they still have high current-carrying capacity in high background fields (>12T). [0003] As a traditional conductor in the field of superconducting strong electric technology, Nb3Sn CICC conductors have been widely used in ITER TF conductors, CS conductors, and Chinese high-magnetic field devices. In all setups, superconducting conductors are operated under multi-field coupled conditions. Future fusion demonstration reactor DEMO (power > 2GW, magnetic field &...
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IPC IPC(8): G01N25/00
Inventor 刘小川武玉秦经刚孔岩松廖国俊朱超邹红飞
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI