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

在这个项目中，我们开发了四种类型的磁传感器，如带三轴搜索线圈的旋转磁通传感器，使用硅钢片励磁铁芯的三轴搜索线圈的旋转磁通传感器，带三轴拾取线圈的微分型旋转磁通传感器和带两个三轴搜索线圈的微分型旋转磁通传感器。它们在检测厚钢板或扁不锈钢板上存在的小反向缺陷方面表现出良好的性能。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估计出背面缺陷的位置、深度等特性。倾角和形状。我们开发了旋转巴克豪森噪声的测量系统。本课题的研究结果如下：1)对于5mm厚的钢板，各种类型的传感器都能清晰地检测到2mm深的背面缺陷。差分型旋转磁通传感器具有两个三轴搜索线圈，可以检测到1毫米深的反向缺陷。2)低激励频率有助于估计小的反向缺陷。3)具有良好的信噪比。4)对于一块5mm厚的不锈钢板，所有类型的传感器都能分辨出背面不同形状的缺陷。5)这些传感器的三轴输出信号包含有关反向缺陷特性的有用信息。6)利用无损检测系统对缺陷特性进行自动估计的结果与给定的结果基本吻合。7)结果表明，在旋转磁场中，巴克豪森噪声能够连续产生，且信号中含有被测材料缺陷或流动的信息。8)研究了旋转和交变磁场条件下巴克豪森噪声的吸引子，明确了混沌信号的存在性。我们能够开发非常有用的无损检测系统来检测和估计存在于厚金属板上的反向缺陷。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