弹性波层析成像技术检测活立木腐朽

Elastic Wave Tomography in Standing Tree Decay Detection

介绍弹性波层析成像技术应用于活立木内部缺陷检测的研究现状,阐述弹性波的产生、传播途径和成像原理,总结该技术在应用中出现的问题。并使用弹性波层析成像技术对美国林务局纳西比特营地脂松活立木进行检测。结果表明:弹性波层析成像技术能够模拟出不规则树干形状并以二维图像方式直观地显示立木腐朽部位、程度、大小及形状等情况。基于此方法发展的设备,具有检测方便、有效、实用性强等特点。

This paper introduces the current research and development on elastic wave tomography technique for detecting internal defects in standing trees. Some key issues in elastic wave tomography, such as elastic wave generation, wave propagation path, and the algorithms for cross-section imaging were briefly reviewed. As a demonstration, the authors evaluated Red Pine （Pinus resinosa） trees in United States Forest Service Camp using Picus sonic tomography tool. The results indicted that the geometrical shape of trunk＇s cross section can be successfully simulated with the tomography tool. The tomogram of the trunk＇s cross section successfully revealed the general location and magnitude of the internal decay of the trees. Base on elastic wave tomography instrument has practical application in city and urban areas for accurately detecting internal decay of standing trees.