电磁声实验平台的研制与实验研究

研制了一个多功能的电磁声实验平台,在此实验平台,进行了"减小盲区"、"钢层下多层橡胶层脱粘检测"、"线性调频脉冲压缩"等方面的实验研究。实验结果表明,该平台可精确控制实验参数,提供单一频率脉冲串和线性调频脉冲两种激励波形,具有信噪比高盲区小的优点和线性调频脉冲压缩的功能。将该实验平台应用在钢层与多层橡胶层粘接件的脱粘检测,取得了与压电检测相当的结果。作为一个电磁声方法和技术研究的工具,该实验平台对开展电磁声检测方法和技术研究以及实际检测应用都是有意义的。 

The research and design of the electromagnetic acoustic experiment system and the experiment research

The design and establishment of an electromagnetic acoustic experimental system for research on the electromagnetic acoustic inspection method and technique was presented. With the system, a series of experiments have been carried out, such as cutting shadow area, disbonding inspection of the multiple rubber layers under the steel layer, chirp pulse compression, etc. The experiment results show that the system is able to control the experiment parameters accurately and generate two kinds of driving pulses such as tone-burst and chirp pulse. It has the higher signal-noise ratio and shorter shadow area and it also has the function of chirp pulse compression. The results of the disbonding inspection of the multiple rubber layers under the steel layer with the experimental system given by this paper are comparable to the results of the disbonding inspection of the same structure with the piezoelectric ultrasonic inspection system. The system is significant to the researches on the electromagnetic acoustic inspection method and technique, and it's also significant to the practical inspection application as a research tool.