PDF(Pubmed)
Abstract：
The precise mapping of magnetic fields emitted by various objects holds critical importance in the fabrication of industrial products. To meet this requirement, this study introduces an advanced magnetic detection device boasting high spatial resolution. The device\'s sensor, an array comprising 256 unpackaged gallium arsenide (GaAs) Hall elements arranged in a 16 × 16 matrix, spans an effective area of 19.2 mm × 19.2 mm. The design maintains a 1.2 mm separation between adjacent elements. For enhanced resolution, the probe scans the sample via a motorized rail system capable of executing specialized movement patterns. A support structure incorporated into the probe minimizes the measurement distance to below 0.5 mm, thereby amplifying the magnetic signal and mitigating errors from nonparallel probe-sample alignment. The accompanying interactive software utilizes cubic spline interpolation to transform magnetic readings into detailed two- and three-dimensional magnetic field distribution maps, signifying field strength and polarity through variations in color intensity and amplitude sign. The device\'s efficacy in accurately mapping surface magnetic field distributions of magnetic and magnetized materials was corroborated through tests on three distinct samples: a neodymium-iron-boron magnet, the circular magnetic array from a smartphone, and a magnetized 430 steel plate. These tests, focused on imaging quality and magnetic field characterization, underscore the device\'s proficiency in nondestructive magnetic field analysis.
摘要：
各种物体发出的磁场的精确映射在工业产品的制造中至关重要。为了满足这一要求，这项研究介绍了一种先进的磁检测装置，具有高空间分辨率。设备的传感器，由256个未封装的砷化镓（GaAs）霍尔元件组成的阵列，排列成16×16矩阵，跨度为19.2mm×19.2mm的有效面积。该设计在相邻元件之间保持1.2mm的间隔。为了增强分辨率，探针通过能够执行专门运动模式的机动轨道系统扫描样品。探头内的支撑结构可将测量距离降至小于0.5mm，从而放大磁信号并减轻来自非平行探针-样品对准的误差。附带的交互式软件利用三次样条插值将磁读数转换为详细的二维和三维磁场分布图，通过颜色强度和振幅符号的变化来表示场强和极性。通过对三个不同样品的测试，证实了该设备在准确映射磁性和磁化材料的表面磁场分布方面的功效：钕-铁-硼磁体，来自智能手机的圆形磁性阵列，和磁化的430钢板。这些测试,专注于成像质量和磁场表征，强调设备在非破坏性磁场分析方面的熟练程度。
