平行平板波导的导电型面板纸蜂窝夹层结构积水检测

Detection of water accumulation in conductive panel paper honeycomb sandwich structure of parallel plate waveguide

针对传统的检测方法存在检测信号源功率高、检测速度慢等问题,且不适用于导电型面板纸蜂窝夹层结构,提出了基于平行平板波导理论的微波检测新方法,该方法具有非接触、对极性分子灵敏度高等综合优势,尤其适合导电型面板纸蜂窝夹层结构内积水的检测。首先,仿真分析了检测方法的可行性,并通过试验验证了仿真结果的正确性。试验结果表明:在8~12 GHz,随着碳纤维复合材料面板纸蜂窝夹层结构内积水量的增加,S21幅值不断减小,铝面板纸蜂窝夹层结构在低频段内满足该规律;然后,区分出铝面板纸蜂窝夹层结构内不同高度的积水积油缺陷;最后,讨论了波导的位置分布对积水缺陷检测的影响。本文为此类蜂窝板内其他缺陷类型的检测提供了新方法。

Aiming at many problems such as high power of detetion signal source and slow detection speed that traditional detection method has,and it is not suitable for conductive panel paper honeycomb sandwich structure,a new method of microwave detection technology based on the theory of parallel plate waveguide is proposed.The method has comprehensive advantages of non-contact and high sensitive to polar molecules,especially suitable for detection of water accumulation in conductive panel paper honeycomb sandwich structure.Firstly,the feasibility of the detection method is analyzed by simulation.The correctness of the simulation results is verified by experiments.The experimental results show that with the increase of water accumulation in the carbon fiber composite panel paper honeycomb sandwich structure,the amplitude of S21 decreases continuously in 8~12GHz.In low detection band,aluminum panel paper honeycomb sandwich structure meet the law.Then,oil and water accumulation defects of different heights in aluminum plate paper honeycomb sandwich structure are distinguished.Finally,the influence of the position distribution of the waveguides on the detection of water accumulation defects is discussed.The research provides a new method for the detection of other types of defects in such honeycomb panels.