Development of The High Grade Magnetic Diagnosis System Using The New Rotational Magnetic Flux Sensor for Non-destructive Testing

在本项目中，我们开发了前几种类型的磁传感器，如旋转磁通传感器与三轴搜索线圈，旋转磁通传感器与三轴搜索线圈使用的励磁铁芯的硅钢片，差动式旋转磁通传感器与三轴拾取线圈和差动式旋转磁通传感器与两个三轴搜索线圈。它们对于检测厚钢板或厚钢板上存在的小的反面缺陷表现出良好的性能。由旋转磁通传感器和神经网络组成的无损检测系统能够自动检测反面缺陷的位置、深度等性质。倾斜角度和形状。并研制了旋转巴克豪森噪声测量系统。本课题的主要成果如下：1）针对5mm厚的钢板，研制了各种类型的传感器 关于我们 板可以清楚地检测到2 mm深的反面缺陷。差动式旋转磁通传感器与两个三轴探测线圈可以检测到一个1 mm深的反面缺陷。2）低激励频率有利于反面小缺陷的估计。3）它们显示了良好的信噪比。4）对于5 mm厚的不锈钢板，所有类型的传感器都可以区分不同形状的反面缺陷。5）这些传感器的三轴输出信号包含了关于反面缺陷特性的有用信息。6）使用NDE系统对缺陷特性进行自动估计的结果与给定的结果基本一致。结果表明，在旋转磁场中能够连续地产生巴克豪森噪声，信号具有8）研究了旋转磁场和交变磁场条件下Barkhousen噪声的吸引子，揭示了信号中混沌的存在，并开发了一套用于检测和估计厚金属板反面缺陷的无损检测系统。少

In this project, we developed fore types of magnetic sensors such as the rotational magnetic flux sensor with the three axis search coil, the rotational magnetic sensor with the three axis search coil using exciting cores made of the silicon steel sheet, the differential type of the rotational magnetic flux sensor with the three axis pickup coil and the differential type of the rotational magnetic flux sensor with two three axis search coils. They showed good performance to detect a small reverse-side defect existing on the thick steel plate or the tick stainless steel plate. The non-destructive evaluation system which consisted of the rotational magnetic flux sensor and the neural network could automatically estimated reverse-side defect properties such as the position, the depth. the inclination angle and the shape. And we developed the measurement system for the rotational Barkhousen noise. Results of this project are shown as follows :1) All types of sensors for a 5 mm thick steel … More plate can clearly detect a 2 mm depth reverse-side defect. The differential type of the rotational magnetic flux sensor with two three axis search coils can detect a I mm depth reverse-side defect.2) The low exciting frequency is useful for estimation of the small reverse-side defect.3) They show good signal to noise ratio.4) All types of sensors for a 5 mm thick stainless steel plate can distinguish different shapes of the reverse-side defects.5) The three axis output signals from these sensors contain useful information about the reverse-side defect properties.6) Results of automatic estimation of defect properties using the NDE system show good agreement with the given ones generally.7) The results showed that the Barkhousen noise was able to be continuously generated in a rotational magnetic field and the signal had information of defects or flows in measuring materials.8) The attractors of Barkhousen noise under some rotating and alternating magnetic field conditions are investigated to make clear the existence of Chaos in the signals.We were able to develop the very useful NDE system to detect and to estimate reverse-side defects existing on a thick metallic plate. Less