1-D probe array for ACFM inspection of large metal plates
1-D probe array for ACFM inspection of large metal plates
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DOI：
10.1109/19.997840
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发表时间：
2002-04-01
影响因子：
5.6
通讯作者：
Mostafavi, RF
中科院分区：
文献类型：
--
作者：
Mirshekar-Syahkal, D;Mostafavi, RF
介绍了一种用于铁磁和非铁磁金属板材无损检测的新型一维ACFM探头阵列系统的原理和实验。在这种线阵中，每个元件由一个线性拾取线圈和一个专门为高检测灵敏度而布置的菱形感应器组成。理论上，阵列的特殊顺序开关布置允许在柔性或普通印刷电路板上将阵列制造成任何所需的长度。给出了开关电路、信号采集系统和信号处理方法，并讨论了开关对阵列长度的限制。文中给出了用于不同矩形金属块(从金属板上切割)的裂纹和锯切缺口样品的阵列信号实例，并讨论了将裂纹信号反演到裂纹深度的方法。
The theory and experiments behind the development of a novel one-dimensional ACFM probe array system for nondestructive evaluation of ferromagnetic and nonferromagnetic metal plates are explained. In this linear array, each element consists of a linear pick-up coil and a rhombic inducer arranged specifically for high detection sensitivity. The special sequential switching arrangement of the array allows the fabrication of the array, theoretically, to any required length on flexible or ordinary printed circuit boards. The switching circuit, the signal acquisition system, and the signal processing method, are presented, and the limitations that the switch imposes on the array length are addressed. Example signals from the array as applied to crack and saw-cut notch samples in different rectangular metal blocks (cut from metal plates) are shown, and methods for the inversion of the crack signal to the crack depth are discussed.