用有限元法对非均匀介质的涡流检测信号进行了数值模拟，并针对检测信号采用逼近的方法预测了表面硬化层深度。
The numerical simulation on the eddy signals was introduced by approaching method based on Finite Elements theory to predict the hardened depth.
基于传统的阶梯式均匀传输线逼近模型，对非均匀传输线进行分段指数逼近。
Based on the conventional ladder model, the exponential model is adopted to approach the nonuniform transmission lines.
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