文献类型：期刊文献

中文题名：传感器的数量与分布对应力波检测原木缺陷效果的影响

英文题名：Effects of Sensor Quantity and Planar Distribution on Testing Results of Log Defects Based on Stress Wave

作者：王立海[1] 徐华东[1] 闫在兴[1] 吕建雄[2] 杨学春[1] 周次林[1]

第一作者：王立海

机构：[1]东北林业大学工程技术学院;[2]中国林业科学研究院木材工业研究所

年份：2008

卷号：44

期号：5

起止页码：115-121

中文期刊名：林业科学

外文期刊名：Scientia Silvae Sinicae

收录：CSTPCD;;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

基金：国家948课题“便携式智能木材内部腐朽探测仪引进”[2002-39(1)];教育部博士点基金课题“基于应力波原木内部腐朽缺陷检测机理的研究”(20040225008);国家自然科学基金课题“原木内部腐朽应力波图像三维重构的研究”(30671643)

语种：中文

中文关键词：原木无损检测;应力波;传感器数量;测试平面分布;检测效果

外文关键词：wood nondestructive testing; stress wave ; sensor quantity; planar distribution; testing results

分类号：S721.5;TP391.41

摘要：对取自黑龙江省带岭林区4个主要树种的10个含有2种缺陷的原木样本进行测试和分析。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。本文通过平面几何学和统计学的基本方法研究了传感器测试平面内的分布对可测最小缺陷面积比的影响,从而找到影响因素并得出结论:在测试工作中通过目测均匀放置传感器即可以达到所要求的测试效果。
The stress-wave nondestructive testing （NDT） technique is developed quickly in the recent years. How to determine the appropriate number of sensors and allocate the sensors in order to improve the testing efficiency and accuracy is one of the common issues. Ten samples of four tree species with two kinds of defects collected from Heilongjiang Province are selected for the study. The results show that for trees with diameter ranging from 20 - 40 cm,at least 12 sensors are needed to ensure a high testing accuracy of roughly 90% of fitness and 0.1 of error rate. Ten sensors are suitable to tell the possible locations of defects and 6 sensors are sufficient to decide whether there are defects. With plane geometry and statistic analysis this study further discusses the impact of planar distribution of sensors on the percentage of minimum detectable defect size （MDDS）. The mathematical model developed in this study indicates the affecting factors and basic rules of the sensor planar allocation on testing results. Finally, it is concluded that a satisfied testing result could be achieved only if the sensors are distributed in uniformity by eyeballing.