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首页> 外文会议>International Symposium on Nondestructive Testing of Wood; 20000913-20000915; Sopron; HU >Factors influencing differential thermal response of knots and clear wood
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Factors influencing differential thermal response of knots and clear wood

机译：影响结和透明木材热响应差异的因素

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摘要

Problems of knot detection for lumber scanning systems have resulted in development of technology to provide more positive knot detection than is currently available for CCD cameras. Knots have successfully been detected by a thermographic system in which knots are either cooler or hotter than clear wood. Radio frequency heating of lumber for 10 seconds produced thermographic images of softwood lumber with knots that differed significantly in temperature from clear wood. For hardwood species knot temperature did not differ significantly from clear wood. Following infrared lamps heating only four of six softwood species and two of six hardwood species had significant differences between knot and clear wood. Measurement of the four physical properties known to influence wood thermal properties showed that specific gravity, extractives content and fibril angle differed significantly between softwood and hardwood species. Equilibrium moisture content did not differ significantly. The higher levels for softwoods of the three variables positively correlated with thermal response explains why detecting knots thermographically is easier for softwoods compared to hardwoods.
机译：木材扫描系统的结节检测问题导致了技术的发展，该技术提供了比目前CCD相机更可靠的结节检测功能。结点已被热成像系统成功检测，其中结点比透明木材凉爽或高温。木材的射频加热10秒产生的软木木材的热像图的结点与透明木材的温度差异很大。对于硬木树种，结温与透明木没有显着差异。红外灯加热后，六个针叶树种中只有四个和六个硬木树种中的两个在结木和透明木之间有显着差异。对已知会影响木材热性能的四种物理性能的测量表明，软木和硬木树种的比重，萃取物含量和原纤维角均存在显着差异。平衡水分含量无显着差异。与热响应呈正相关的三个变量中，针叶木的含量较高，这解释了为什么与硬木相比，对针叶木进行热成像结点检测更容易。

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