非接触测厚的电涡流传感器的最佳设计

THE OPTIMAL DESIGN OF EDDY CURRENT DETECTOR USED IN NONCONTACT THICKNESS MEASUREMENT

为了抑制电涡流变频法在线测厚中的提离效应,根据C.V.Dodd等人的理论,作者建立了电涡流双侧差动式线圈的数学模型,对1cr18Ni9Ti冷轧带材在线测厚进行了实验分析。结果表明,在抖动幅度<±2mm下,用差动变频法对上述带材进行测厚,通过合理选择参数,系统精度≥4％。

The mathematic model for eddy-current differential coil was set up. Theoretical analysis and experiments were conducted refer to the liftoff effects in thickness measurment of 1Crl8Ni9Ti cold rolled stainless steel plates. The result shows that the systematical precison of the method is 4% when the lift-off amplitude is within ±2 mm.