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马尾松木材空洞开裂残损的雷达检测成像初探

陈勇平 高甜 李德山 郭文静

陈勇平, 高甜, 李德山, 郭文静. 马尾松木材空洞开裂残损的雷达检测成像初探[J]. 北京林业大学学报, 2017, 39(3): 112-118. doi: 10.13332/j.1000-1522.20160313
引用本文: 陈勇平, 高甜, 李德山, 郭文静. 马尾松木材空洞开裂残损的雷达检测成像初探[J]. 北京林业大学学报, 2017, 39(3): 112-118. doi: 10.13332/j.1000-1522.20160313
CHEN Yong-ping, GAO Tian, LI De-shan, GUO Wen-jing. Preliminary study on radar detection and imaging of cavities and cracks of Pinus massoniana[J]. Journal of Beijing Forestry University, 2017, 39(3): 112-118. doi: 10.13332/j.1000-1522.20160313
Citation: CHEN Yong-ping, GAO Tian, LI De-shan, GUO Wen-jing. Preliminary study on radar detection and imaging of cavities and cracks of Pinus massoniana[J]. Journal of Beijing Forestry University, 2017, 39(3): 112-118. doi: 10.13332/j.1000-1522.20160313

马尾松木材空洞开裂残损的雷达检测成像初探

doi: 10.13332/j.1000-1522.20160313
基金项目: 

故宫博物院科研课题 KT2015-06

国家自然科学基金项目 31570711

详细信息
    作者简介:

    陈勇平,博士,副研究员。主要研究方向:木材无损检测,单板类材料加工利用。Email:chenyp@caf.ac.cn  地址:100091  北京市海淀区香山路东小府1号中国林业科学研究院木材工业研究所

    责任作者:

    郭文静,博士生导师,研究员。主要研究方向:木基复合材料。Email:guowj@caf.ac.cn。地址:同上

  • 中图分类号: S781.5; TN958

Preliminary study on radar detection and imaging of cavities and cracks of Pinus massoniana

  • 摘要: 本研究以木结构古建筑常用的马尾松木材为研究对象,采取人工模拟的方法在马尾松木段端部制作中心空洞及外缘开裂的残损,通过开展残损木材的雷达探测及成像影响因素研究,给出不同残损在雷达检测下的表现形态,实现木材内部空洞和外缘开裂残损的快速识别及表征。研究结果表明:利用雷达无损检测技术可以实现木材内部空洞和外缘开裂残损的快速检出,而对残损大小的评估,雷达检测面积与实际残损面积存在偏差;当雷达探测到木材内部空洞时,其交界面会出现强烈的黑-白-黑形态图像,对应的反射波形为谷-峰-谷;当雷达探测到木材外缘开裂等凹陷特征时,其图像上会出现不同于正常背景的纵向干扰条纹;木材外缘开裂并不严重影响内部空洞残损的检出,木材表面存在贴合紧密的树皮或保护性地仗对内部残损的识别也无明显影响;木材含水率对雷达检测结果影响较为显著,在其他条件一定时,木材含水率越高,其雷达检测残损面积越小;雷达检测结果受含水率等因素影响,其残损的检测边界可能会产生一定的偏移,因此,在实际检测中应根据雷达检测图像进行深度方向的延伸分析。通过本研究可知:雷达无损检测技术可以实现木材空洞和开裂残损的快速检出,但对于残损的定量评估有待于进一步研究。

     

  • 图  1  木段残损模拟加工

    Figure  1.  Fabrication of cavity and crack damages in wood columns

    图  2  树木雷达检测设备及测试方法

    Figure  2.  Tree radar unit and testing method

    图  3  健康及残损木材的雷达检测结果

    Figure  3.  Testing results of the healthy and damaged wood columns by TRU

    图  4  木材开裂残损的雷达波检测结果

    Figure  4.  Testing results of the crack damages in wood columns by TRU

    图  5  外缘开裂木材内部空洞残损的雷达波检测结果

    Figure  5.  Testing results of the cavity damage in wood columns with external cracks by TRU

    图  6  木材内部空洞残损的雷达波检测结果

    Figure  6.  Testing results of the cavity damages in wood columns by TRU

    图  7  不同含水率下木材内部空洞残损的雷达波检测结果

    Figure  7.  Testing results of the cavity damages in wood columns with different moisture contents by TRU

    图  8  不同含水率下木材内部空洞残损的雷达波成像结果

    Figure  8.  Imaging results of the cavity damages in wood columns with different moisture contents by TRU

    表  1  不同含水率木材空洞残损面积的雷达测算与统计(1#木段)

    Table  1.   Calculation and statistics of the cavity areas in wood columns with different moisture contents by TRU

    %
    序号
    No.
    含水率
    Moisture content
    实际残损百分比
    Percentage of actual damage area
    雷达预测残损百分比
    Percentage of damage area determined by TRU
    相对误差
    Relative error
    110011.963.5470.40
    22011.965.1756.77
    31211.966.1848.33
    下载: 导出CSV
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  • 收稿日期:  2016-09-29
  • 修回日期:  2016-12-12
  • 刊出日期:  2017-03-01

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