| 传感器数量对应力波检测原木内部缺陷精度的影响 |
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| 引用本文： | 王立海,徐华东,周次林,李莉,杨学春.传感器数量对应力波检测原木内部缺陷精度的影响[J].林业研究,2007,18(3). |
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| 作者姓名： | 王立海 徐华东 周次林 李莉 杨学春 |
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| 作者单位： | 东北林业大学,哈尔滨,150040;东北林业大学,哈尔滨,150040;东北林业大学,哈尔滨,150040;东北林业大学,哈尔滨,150040;东北林业大学,哈尔滨,150040 |
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| 基金项目： | This paper was supported by the project “Devel-opment of Portable NDT Instrument (2002(39-1))” sponsored by Na-tional Forestry Administrative Bureau of China |
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| 摘 要： | 木材无损检测技术是高效利用木材的方法之一.该文阐述了应力波法检测木材缺陷的原理,分析了传感器数量对图像的拟合度和误差率两个指标的影响.结果表明,当原木直径在20～40cm范围内时,若需对原木缺陷进行精确测量,要求图像拟合度接近90%和误差率在0.1左右时,至少需12个传感器才能满足要求;当不需要对原木缺陷进行精确测量,只需确定缺陷的大致位置时,宜选用10个传感器进行测量;当仅仅需要判断原木是否存在缺陷时,选用6个传感器就能满足要求.图3表4参8.
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| 关 键 词： | 传感器数量 原木缺陷检测 应力波 图像拟合度 |
Effect of sensor quantity on measurement accuracy of log inner defects by using stress wave |
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| WANG Li-hai,XU Hua-dong,ZHOU Ci-lin,LI Li,YANG Xue-chun.Effect of sensor quantity on measurement accuracy of log inner defects by using stress wave[J].Journal of Forestry Research,2007,18(3). |
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| Authors: | WANG Li-hai XU Hua-dong ZHOU Ci-lin LI Li YANG Xue-chun |
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| Abstract: | Wood nondestructive testing (NDT) is one of the high efficient methods in utilizing wood. This paper explained the principle of log defect testing by using stress wave,and analyzed the effects of sensor quantity on defect testing results by using stress wave in terms of image fitting degree and error rate. The results showed that for logs with diameter ranging from 20 to 40 cm,at least 12 sensors were needed to meet the requirement which ensure a high testing accuracy of roughly 90% of fitness with 0.1 of error rate. And 10 sensors were recom-mended to judge the possible locations of defects and 6 sensors were sufficient to decide whether there were defects or not. |
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| Keywords: | Sensor quantity Log defect testing Stress wave Image fitting degree |
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