具有抑制“提离”效应的旋转座标法

SUPPRESS LIFT-OFF EFFECT BY COORDINATE ROTATING METHOD

提离效应是在涡流检测中普遍存在的一种干扰因素。它对检测结果有很大的影响。为此，本文提出了旋转座标抑制提离效应的方法，并把单片机技术引入到相应的电路中去。实验结果表明．该法对提离效应的抑制是有效的。同时，智能化的提离抑制电路，大大降低了检测时人为因素的影响，提高了检测的准确率和重复精度，具有较大的实用价值。

Lift -off effect is a common unnecessary facfor in eddy current test. It has great influence on the test results. In this paper,a coordinate rotating method is proposed tosuppress the lift -off effect,besides,single-chip microcomputer technique is introducedto circuitry. The results of experiments show that this method is not only effective,butalso cuts down the influence of artificial factors,improves measuring accuracy and repeatability. So it can be said this method has a fairly good practical value.