基于脉冲涡流信号的金属膜厚测量

脉冲涡流检测技术能够快速方便地检测金属导体厚度，为了研究脉冲涡流检测技术在金属膜厚测量中的应用，首先设计了测量系统传感器，并分析了其工作原理；采用ANSOFT软件对不同测试金属厚度下传感器的响应信号进行了仿真计算；然后搭建了实际的测厚系统，对不同厚度的铝箔进行了检测，并对实验数据采用三次样条插值进行了拟合，得到了金属膜厚与电压信号的关系。研究结果表明：采用脉冲涡流技术能够较准确地测量出金属膜的厚度。

Thickness measurement of metallic coating from pulsed eddy-current signals

As a new branch of the eddy current nondestructive testing,the pulsed eddy current testing technology can detect the thickness of the metal conductor quickly and easily. In order to study the technology in the measuring of the thickness of the metal, the sensor was de- signed firstly and its operating principal was analyzed. The ANSOFT software was used to get the response signal in different metal thickness. Different thickness of aluminum foils were detected and cubic spline interpolation was used to fit experimental data. The relationship between the thickness and voltage signals was obtained. The conclusion shows that the thickness of the metal can be detected precisely on the pulsed eddy current testing technology.