Abstract: Eddy current (EC) distribution induced by EC sensors determines the interaction between the defect in the testing specimen and the EC, so quantitatively evaluating EC distribution is crucial to the design of EC sensors. In this study, two indices based on the information entropy are proposed to evaluate the EC energy allocated in different directions. The EC vectors induced by a rotational field EC sensor varying in the time domain are evaluated by the proposed methods. Then, the evaluating results are analyzed by the principle of EC testing. It can be concluded that the two indices can effectively quantitatively evaluate the EC distributions varying in the time domain and are used to optimize the parameters of the rotational EC sensors.

Key words: information entropy, eddy current testing, non-destructive testing, rotational field eddy current probe, angular spectrum

摘要： 涡流传感器感应的涡流分布决定了检测试样中缺陷与涡流之间的相互作用，因此定量评估涡流分布对于设计涡流传感器至关重要。本研究提出了两个基于信息熵的指标来评估不同方向上分配的涡流能量。通过所提出方法评估了时域变化旋转场涡流传感器感应的涡流向量。然后，通过涡流检测原理对评估结果进行了分析。结果表明，这两个指标可以有效地定量评估时域变化的涡流分布，并将用于旋转涡流传感器参数的优化。

关键词: 信息熵，涡流检测，无损检测，旋转场涡流传感器，角度谱