为了分析电磁轨道炮连续发射后, 轨道上的沉积层分布特性, 提出了基于涡流的沉积层厚度测试方法.根据涡流测厚的工作原理, 给出了系统结构设计方案;建立了基于涡流的沉积层厚度测试仿真模型, 分析了激励频率、提离距离、线圈高度、铁芯等对涡流探头性能的影响.研究结果表明:通过涡流探头检测线圈输出的差分信号的幅值, 能够实现沉积层厚度检测的测量;通过采用铁芯、较大的激励频率和较小的提离距离, 能够提高涡流探头对沉积层厚度检测的灵敏度;涡流探头线圈存在可使探头输出的差分信号达到最大值的最佳高度.%For the analysis of the characteristics of the sedimentary layers on the rails after repeated launching, the depth measurement of the sedimentary layers based on eddy current was put forward. The working principle of the depth measurement based on eddy current was introduced, and then the configurations of the system was given. The simulation model of the depth measurement of the sedimentary layers based on eddy current was established. The influence of the excitation frequency, the lift-off distance, the height of the coils, and the ferromagnetic core to the performance of the eddy current probe was analyzed. The research results reveal that the depth of the sedimentary layers can be measured by the differential amplitude of the pick-up coil in the eddy current probe. Furthermore, the ferromagnetic core, higher excitation frequency and smaller lift-off distance can improve the eddy current probe sensitivity to the depth of the sedimentary layers measurement. Meanwhile, the probe can obtain the highest differential amplitude voltage with the coils of the eddy current probe.
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