Based on numerical analysis of eddy current transmit-receiver sensor, different centre distance, average radius and high of eddy current array sensor coil unit are analyzed according to sensitivity and spatial resolution. This paper presents a parameter closely relating with less sensitive zone—efficient detecting zone ratio of coil unit group,which assists with the optimal design of the placement of eddy current array sensor. The results show that, on the same situation, the smaller the average radius and height are, the larger the sensitivity is. In nearly but smaller than quadruple outer radius, there is a peak value in the curve of the sensitivity. The smaller the average radius is, the higher of the spatial resolution is. The areas of the less sensitive zone and the possibility of failing to identity flaw is least considering the mixed cover zone of two adjacent coil unit group of the interlaced type eddy current array probe.%基于互感式传感器涡流检测的数值计算方法,综合检测灵敏度和空间分辨率对涡流阵列传感器线圈单元不同中心距、平均半径、高度等参数进行了分析.提出了与涡流阵列检测不敏感区域密切相关的参数--线圈单元组有效检测区域比率,基于该参数进行了涡流阵列传感器排布方式的优化设计.研究结果表明:相同检测条件下,线圈单元平均半径越小,线圈单元高越小,检测灵敏度越大;线圈单元中心距大小与检测灵敏度呈先递增后递减的关系,在接近且小于4倍的线圈单元外径处检测灵敏度存在一极值点;线圈单元平均半径越小,涡流阵列传感器的空间分辨率越高;交错型涡流阵列传感器相邻单元组叠加方式不敏感区域最小,漏检可能也最小.
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