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基于阻抗仪和ERT技术的红松内部腐朽定量检测

时小龙 王立海 徐华东 徐庆波 曹时凯 许明贤

时小龙, 王立海, 徐华东, 徐庆波, 曹时凯, 许明贤. 基于阻抗仪和ERT技术的红松内部腐朽定量检测[J]. 北京林业大学学报, 2017, 39(9): 102-111. doi: 10.13332/j.1000-1522.20170196
引用本文: 时小龙, 王立海, 徐华东, 徐庆波, 曹时凯, 许明贤. 基于阻抗仪和ERT技术的红松内部腐朽定量检测[J]. 北京林业大学学报, 2017, 39(9): 102-111. doi: 10.13332/j.1000-1522.20170196
SHI Xiao-long, WANG Li-hai, XU Hua-dong, XU Qing-bo, CAO Shi-kai, XU Ming-xian. Quantitative characterization of decay detection in standing trees of Korean pine based on Resistograph and ERT[J]. Journal of Beijing Forestry University, 2017, 39(9): 102-111. doi: 10.13332/j.1000-1522.20170196
Citation: SHI Xiao-long, WANG Li-hai, XU Hua-dong, XU Qing-bo, CAO Shi-kai, XU Ming-xian. Quantitative characterization of decay detection in standing trees of Korean pine based on Resistograph and ERT[J]. Journal of Beijing Forestry University, 2017, 39(9): 102-111. doi: 10.13332/j.1000-1522.20170196

基于阻抗仪和ERT技术的红松内部腐朽定量检测

doi: 10.13332/j.1000-1522.20170196
基金项目: 

国家自然科学基金项目 31570547

详细信息
    作者简介:

    时小龙,博士生。主要研究方向:木材无损检测。Email:1105318962@qq.com  地址:150040 黑龙江省哈尔滨市和兴路26号东北林业大学工程技术学院

    责任作者:

    王立海,教授,博士生导师。主要研究方向:无损检测。Email:lihaiwang@yahoo.com  地址:同上

  • 中图分类号: S781.5

Quantitative characterization of decay detection in standing trees of Korean pine based on Resistograph and ERT

  • 摘要: 为了定量表征红松活立木内部腐朽情况,在黑龙江省五营国家森林公园选取了15棵有不同腐朽程度的红松,应用Resistograph树木微钻阻抗仪和PiCUS Treetronic树木电阻断层成像仪得到南北向与东西向的微钻阻力变化和同样高度上的截面电阻率分布图,对比分析阻抗仪测量方向上的电阻率变化和微钻阻力变化。用树木生长锥在样木的测量位置附近各取南北向与东西向的木芯,将其带回实验室测量质量损失率。将微钻阻力的下降幅度定义为阻力损失,对阻力损失和木芯质量损失率进行回归分析。还用腐朽和健康部分的电阻率均值定义了电阻率的异常程度, 并对其和阻力损失进行了回归分析。以阻抗仪为基准在电阻率分布图上对腐朽部位定位,应用监督分类的方法在图上将腐朽与健康部分区分出来,并计算腐朽面积所占比例。然后用最小二乘法将算得的比例与木芯质量损失率作回归分析。结果表明:平均阻力损失与木芯质量损失率之间存在显著的线性相关关系,阻抗仪可以较准确地表征一维直线上的腐朽情况;微钻阻力变化曲线上发生阻力值明显下降的位置对应的电阻率也会发生明显变化,阻力损失值和电阻率异常程度存在显著指数关系,还能推断出电阻断层成像检测对于轻度腐朽更加敏感,而阻抗仪检测对较严重的腐朽更加敏感;联合阻抗仪和电阻断层成像技术能够确定腐朽的位置和面积,得到的腐朽面积所占比例与木芯质量损失率有显著线性相关关系。

     

  • 图  1  木芯照片

    Figure  1.  Photo of wood core

    图  2  电阻率和微钻阻力随探头钻入深度的变化

    H1H2分别为波谷的左右两边在右侧微钻阻力坐标轴上的投影长度(resi);D1为波谷在横坐标上的投影长度(mm)。

    Figure  2.  Electrical resistivity and micro-drilling resistance varying with drilling depth

    H1 and H2 are projection lengths (resi) of left and right sides of the trough on the vertical axis of mocro-drilling resistance curve, respectively; D1 is projection length (mm) of the trough on the horizontal axis.

    图  3  质量损失率与平均阻力损失散点图

    Figure  3.  Scatter-plot of mass loss rate and average of resistance loss

    图  4  ERT图像

    Figure  4.  ERT image

    图  5  电阻率异常程度和阻力损失散点图

    Figure  5.  Scatter-plot of abnormal extent of electrical resistivity and resistance loss

    图  6  ERT图像分析过程

    Figure  6.  Process of analyzing ERT image

    图  7  质量损失率和ERT图像中腐朽面积比例散点图

    Figure  7.  Scatter-plot of mass loss rate and percentage of decay area in ERT image

    表  1  样木的基本情况

    Table  1.   Profile of 15 sample trees to be measured

    样木编号
    No. of sample tree
    胸径
    DBH/mm
    树高
    Height of tree/m
    含水率
    Moisture content/%
    141122.840.88
    279631.438.44
    361829.750.46
    460027.969.92
    571330.846.97
    648727.741.50
    746125.653.67
    835921.754.42
    943924.934.33
    1064030.349.17
    1156327.532.01
    1258328.434.13
    1353726.856.97
    1466529.235.39
    1546826.153.90
    下载: 导出CSV

    表  2  质量损失率与平均阻力损失

    Table  2.   Mass loss rate and average of resistance loss

    样木编号
    No. of sample tree
    平均阻力损失
    Average of resistance loss/resi
    质量损失率
    Mass loss rate/%
    119.0032.48
    221.5146.24
    37.2419.80
    45.0436.12
    52.1510.46
    622.5535.37
    74.4524.63
    84.6419.33
    926.0040.04
    106.377.81
    1132.1851.15
    1219.6443.47
    134.2223.95
    1415.4429.45
    1526.7468.92
    下载: 导出CSV

    表  3  阻力损失及对应的电阻率异常程度

    Table  3.   Resistance loss and corresponding abnormal extent of electrical resistivity

    样木编号
    No. of sample tree
    方向
    Direction
    波谷个数
    Number of troughs
    左端圆心距
    Center distance of left end (d1)/mm
    右端圆心距
    Center distance of right end (d2)/mm
    阻力损失
    Resistance loss/resi
    电阻率异常程度
    Abnormal extent of electrical resistivity/%
    1东西向East-west378.031.59.14103.83
    31.5-44.08.5043.73
    -62.5-77.01.3739.63
    2南北向North-south2266.5-43.527.36116.56
    257.0185.56.6857.53
    东西向East-west2185.5167.01.0242.73
    142.0-23.07.9477.21
    3东西向East-west2299.0250.04.769.72
    167.0132.02.4852.31
    4东西向East-west1160.0119.05.0496.23
    5南北向North-south2-10.5-30.51.4929.56
    -30.5-55.51.6623.60
    东西向East-west1314.0284.51.145.17
    6南北向North-south4107.558.55.0833.98
    51.013.55.5814.15
    13.50.51.2217.42
    -21.5-81.56.4821.20
    东西向East-west2156.571.07.1742.33
    39.5-83.519.56121.21
    7南北向North-south2-52.0-72.52.758.12
    -77.5-92.51.3719.72
    东西向East-west28.0-19.53.0042.00
    -108.5-125.51.7761.47
    8南北向North-south1127.0106.54.640.75
    9南北向North-south229.5-28.010.81111.24
    -28.0-155.520.69127.96
    东西向East-west4113.554.57.7390.79
    44.5-8.03.8063.61
    -8.0-74.57.8338.58
    -116.0-128.51.144.37
    10南北向North-south225.0-23.03.1562.00
    -34.0-76.03.9475.07
    东西向East-west1194.0106.05.6464.32
    11南北向North-south164.5-154.534.62129.35
    东西向East-west3160.5141.51.5121.56
    141.598.53.4010.99
    98.5-134.524.83111.51
    12南北向North-south2216.5151.56.836.83
    96.5-33.54.464.46
    东西向East-west1136.5-103.527.99112.42
    13南北向North-south1-121.5-152.03.4143.99
    东西向East-west1-121.5-166.55.0391.07
    14南北向North-south4238.5170.56.0123.65
    170.5155.50.7953.95
    140.5106.52.7536.76
    106.522.54.8926.78
    东西向East-west2161.55.013.06109.34
    -15.5-71.53.373.49
    15南北向North-south1188.0-167.032.03114.87
    东西向East-west2185.0140.05.1240.39
    140.0-56.016.33120.13
    下载: 导出CSV

    表  4  ERT图像中腐朽面积占截面比例

    Table  4.   Percentage of decay area in ERT image

    样木编号No. of sample tree123456789101112131415
    腐朽面积比例Percentage of decay area (Pd)/%33.6040.8828.9034.0926.8937.6523.2421.4242.5319.5955.2165.2522.3843.8175.37
    下载: 导出CSV
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  • 收稿日期:  2017-06-02
  • 修回日期:  2017-08-29
  • 刊出日期:  2017-09-01

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