漏磁法测量导磁材料的厚度及缺陷

阐述了电磁式漏磁通法检测导磁材料厚度及缺陷的原理，推导了厚度测量的理论依据．基于该原理设计了传感器，建立了试验平台，并对影响传感器特性的单一因素进行了试验与分析．结果表明：采用聚磁件。减小提高距离，增加线圈匝数和励磁电流，减小传感器列间隙，减少磁化时间均可提高传感器分辨率；环境温度对测量结果影响可以忽略；对缺陷只能作定性检测；被测对象的材质对测量结果影响较大，检测不同材质对象时应分别标定．

Thickness Measurement and Detection for Magnetic Materials Using Magnetic Leakage Flux Method

Measuring principle of the thickness and defect of magnetic materials was given. Based on the principle, an experimental set-up with a designed sensor was built. Through the sensor character experiments, some conclusions were obtained: the presence of magnetism-concentrating components, shorter lift-off distance, higher excitation current, more coil turns, less spacing between arrayed sensors and fewer magnetization time are all help to increase the sensor sensitivity. The influence of environment temperature to the measurement errors is less notable. The defect can be qualitatively determined easily, but it is different to give the quantificational parameters. The sensor should be calibrated again when different material objects are tested.