Prewitt 霍尔磁梯度张量系统结构设计

为实现高速磁浮轨道长定子行波主漏磁场小空间、mT量级磁梯度张量的准确测量,将图像边缘检测领域的Prewitt梯度算子进行实例化,设计了一种由8只霍尔磁敏传感器构成的小体积、低成本的磁梯度张量测量结构。通过空间冗余的手段,克服了霍尔磁敏传感器零点偏移大,灵敏度一致性差的特点,也为传统磁梯度张量测量系统传感器的空间布局提供了一种新的思路。实验结果表明,相对传统十字形、正方形结构,Prewitt结构可将多传感器上述两种参数不一致导致的测量误差分别减小至原来的-10.4%和58.1%,有效降低了测量系统对传感器参数一致性的要求,避免了复杂高成本的三轴传感器标定与误差校正环节。

Structure design of Prewitt hall magnetic gradient tensor system

To realize the accurate measurement of mT magnitude magnetic gradient tensor in small space for traveling wave main magnetic flux leakage of high-speed maglev track stator, the Prewitt gradient operator of image edge detection is instantiated. A small volume and low-cost Hall magnetic gradient tensor measurement structure including 8 Hall magnetic sensors is designed. It overcomes the characteristics of large zero drift and poor sensitivity consistency of the Hall magnetic sensor by spatial redundancy, which provides a new way for sensors spatial layout design of the magnetic gradient tensor system. Compared with the traditional cross and square structure, experimental results show that the Prewitt structure can reduce the measurement error caused by the inconsistency of the above two parameters of multi-sensors to - 10. 4% and 58. 1% . The requirements of the measurement system for the consistency of sensor parameters is effectively reduced, and the complex and high-cost calibration of the three-axis sensor and error correction are avoided.