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热核聚变实验堆中超导母线绝缘层的红外热波检测
Infrared thermal wave imaging for inspecting the insulation layer of superconducting busbar in thermonuclear experimental reactor
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摘要: 本项研究的目的在于探索热核聚变实验堆中超导母线绝缘层的主动式红外热波检测方法.文中用装有热水的薄膜袋对预埋脱黏缺陷的试件表面进行接触热激励;给出了在面热源作用下长圆柱内一维瞬态导热的近似理论模型;通过对理论模型的模拟和分析,发现对热波降温信号进行微分处理可有效提高缺陷和非缺陷信号对比度;与闪光灯激励的结果进行比较,显示接触热激励的检测深度优于闪光灯脉冲热激励.Abstract: This work aims at developing a thermal wave imaging method for testing the insulation layer of superconducting busbar in thermonuclear experimental reactor. In the paper, a film bag filled with hot water is used to heat the sample surface. The approxi- mate theoretical model of transient heat conduction under an instantaneous cylindrical surface source in cylindrical structure is given. Through simulation and analysis of the theoretical model, it is found that differential processing of the thermal cooling signals can improve the signal contrast between defects and non-defects areas. Compared with the flash pulse excitation method, the contact excitation method can detect deep defects.
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