活立木内部缺陷雷达波检测研究
发布时间：2018-07-18 15:32
【摘要】：针对活立木内部结构复杂,个体化差异较大,导致雷达波图像难以解析的问题,提出了一种基于振幅比在线估计相对介电常数以及利用希尔伯特积进行层位追踪实现缺陷界面的相对定位,并结合活立木外轮廓点云数据确定其内部缺陷绝对位置和分布表征的方法,以此开发了基于雷达波的活立木内部结构缺陷分析软件。采用基于时域有限差分法的正演模拟、实验室原木试件检测分析、颐和园现场活立木检测等实验验证方法的可行性。结果表明可对检测目标点准确定位,复现树干内部横截面图像,雷达波成像结果与古树复壮时内部实际结构相符。
[Abstract]:Aiming at the problem that the internal structure of the living tree is complex and the individual difference is great, it is difficult to analyze the radar wave image. Based on amplitude ratio on-line estimation of relative dielectric constant and using Hilbert product to realize the relative localization of defect interface, a new method is proposed. Combined with the method of determining the absolute position and distribution of internal defects, a software based on radar wave is developed to analyze the defects of the inner structure of standing trees. Forward modeling based on finite-difference time-domain method (FDTD), laboratory log testing and analysis, and the Summer Palace field test were used to verify the feasibility of the method. The results show that the target points can be accurately located and the cross section images of trunk can be reproduced. The results of radar wave imaging are consistent with the actual structure of the ancient trees when they are rejuvenated.
【作者单位】： 北京林业大学工学院;北京市颐和园管理处;
【基金】：中央高校基本科研业务费专项资金项目(2017ZY27) 国家自然科学基金项目(31600589)
【分类号】：TN957.52
[Abstract]:Aiming at the problem that the internal structure of the living tree is complex and the individual difference is great, it is difficult to analyze the radar wave image. Based on amplitude ratio on-line estimation of relative dielectric constant and using Hilbert product to realize the relative localization of defect interface, a new method is proposed. Combined with the method of determining the absolute position and distribution of internal defects, a software based on radar wave is developed to analyze the defects of the inner structure of standing trees. Forward modeling based on finite-difference time-domain method (FDTD), laboratory log testing and analysis, and the Summer Palace field test were used to verify the feasibility of the method. The results show that the target points can be accurately located and the cross section images of trunk can be reproduced. The results of radar wave imaging are consistent with the actual structure of the ancient trees when they are rejuvenated.
【作者单位】： 北京林业大学工学院;北京市颐和园管理处;
【基金】：中央高校基本科研业务费专项资金项目(2017ZY27) 国家自然科学基金项目(31600589)
【分类号】：TN957.52
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