激光超声在木材无损检测中的仿真研究  

Simulation of Laser Ultrasound in Wood Nondestructive Testing

作　　者：张晓萌 余观夏[2] 许为凤 骆敏[2] 杜文文 吕一航 

机构地区：[1]南京林业大学,材料科学与工程学院,江苏南京 [2]南京林业大学理学院,江苏南京 [3]南京林业大学,信息科学与工程学院,江苏南京

出　　处：《应用物理》2018年第11期480-488,共9页Applied Physics

摘　　要：本文主要通过软件进行数值仿真来探究激光超声在木材中的激发机理、激光激发超声波在木材中的传播特性,以及木材特殊的多孔结构对超声信号的共振吸收和散射作用,并在此基础上分析了内部空洞和表面缺陷对超声信号的影响,数值仿真的结果表明缺陷的存在导致超声波明显的反射、透射、衍射等现象,可以鉴定木材的内部空洞和表面缺陷的存在。这为激光超声技术实现木材缺陷无损检测提供了数值和理论依据,也有助于丰富激光超声理论,更重要的是将为木材和木质材料的无损检测提供新的途径。By the numerical simulation, the mechanism of laser ultrasound and propagation characteristics in the wood and porous structure of wood and special effect on the resonance absorption and scattering of ultrasonic signal have been investigated. Based on the analysis of the inner cavity surface defects and the influence of ultrasonic signal, the numerical simulation results show that the existence of defects in ultrasonic obvious reflection, transmission and diffraction phenomenon, can identify the existence of the inner cavity and surface defects of wood. This provides a numerical and theoretical basis for the realization of wood defect nondestructive testing by laser ultrasound technology, contributes to enrich the theory of laser ultrasonic and, more importantly, provides a new way for the nondestructive testing of wood and wood materials.

关 键 词：激光超声 木材 无损检测 

分 类 号：G6[文化科学—教育学]