上海科技大学知识管理系统

本申请提供一种燃料棒氧化膜厚度测量系统及方法，所述系统包括：激励信号源，用于提供激励信号；探头模块，所述探头模块采用电桥结构，所述电桥结构的输入端连接所述激励信号源，所述电桥结构的输出端输出差分信号；处理模块，所述处理模块连接所述探头模块的输出端，用于对所述差分信号进行处理后获取反映氧化膜厚度信息的基频解调信号；上位机，对所述基频解调信号进行处理后获取燃料棒的氧化膜厚度。所述方法基于所述系统，通过对多频激励下的测量结果进行处理，减小不同样品间燃料棒包壳管电导率差异以及金属涂层厚度差异的影响，实现燃料棒氧化膜厚度的精密测量。

The invention provides a system and a method for measuring the thickness of an oxide film of a fuel rod. The system comprises an excitation signal source for providing an excitation signal; A probe module, wherein the probe module adopts an electric bridge structure, an input end of the electric bridge structure is connected with the excitation signal source, and an output end of the electric bridge structure outputs a differential signal; A processing module connected to the output end of the probe module and configured to obtain a fundamental frequency demodulation signal reflecting oxide film thickness information after processing the differential signal; The upper computer is used for obtaining the thickness of the oxide film of the fuel rod after processing the fundamental frequency demodulation signal. The method is based on the system, the measurement results under the multi-frequency excitation are processed, the influence of the difference of the conductivity of the fuel rod cladding tube and the difference of the thickness of the metal coating between different samples is reduced, and the precise measurement of the thickness of the oxide film of the fuel rod is realized.