含水率对木材缺陷红外热成像效果的影响  被引量:2

Effect of Moisture Content on the Thermal Infrared Image of Wood Defects

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作  者:时学庆 刘美爽[2] SHI Xue-qing;LIU Mei-shuang(Huangshui Forest Farm,Ledu District,Haidong City,Qinghai Province,Haidong Qinghai 810700,P.R.China;Northeast Forestry University,Engineering and Technical College,Harbin Heilongjiang 150040,P.R.China)

机构地区:[1]青海省海东市乐都区湟水林场,青海海东810700 [2]东北林业大学,黑龙江哈尔滨150040

出  处:《西部林业科学》2020年第5期59-64,共6页Journal of West China Forestry Science

基  金:黑龙江省自然科学基金面上项目(C201410);哈尔滨市应用技术研究与开发项目(2017RAQXJ078)。

摘  要:为研究含水率对不同木材缺陷红外热成像效果的影响,选择冷杉和枫桦2个树种,采用红外热成像技术对试材不同含水率条件下的节子、裂纹和孔洞3种缺陷经红外热成像获得热图进行分析。结果表明:(1)对于冷杉和枫桦,当含水率不同时,其热图效果具有明显的差异;(2)对于同一树种,含水率相同而缺陷不同时,所获取的热图反应缺陷的效果也不一样;(3)对于同一种缺陷,含水率相同,树种不同时,所获得的热图反应缺陷的效果也不同;(4)利用红外热成像技术对木材检测时,不同树种和木材的缺陷种类会对应一个成像效果最好的含水率。在不同情况下,最佳含水率分别为:冷杉和枫桦的孔洞缺陷48%;冷杉裂纹缺陷52%;枫桦裂纹缺陷32%;冷杉节子缺陷48%;枫桦节子缺陷36%。本研究结果为实际生产中的木材无损检测提供参考。In order to study the effect of moisture content on the infrared thermal imaging effect of different wood defects,this paper selected two species of fir and maple birch,and the three defects of knots,cracks and holes under different moisture content conditions were obtained by infrared thermal imaging.Heat map for analysis.Through experimental research,the comparison and analysis of different images show that:(1)For fir and maple birch species,when the water content is different,the heat map effect has a significant difference;(2)For the same tree species,the same water content and different defects.The effect of the obtained heat map reaction defects is different;(3)For the same defect,the same moisture content,different tree species,the obtained heat map reaction defects are also different;(4)Infrared thermal imaging technology for wood detection,different defective species of tree species and wood will have a moisture content with the best imaging effect.The optimal moisture content of the hole defects of fir and maple birch is 48%;the optimal moisture content of crack defects of fir is 52%;the optimal moisture content of crack defects of maple and birch is 32%;the optimal moisture content of fir node defect is 48%;The optimal moisture content of the maple birch node defect is 36%.

关 键 词:红外热成像 木材无损检测 图像处理 相对含水率 

分 类 号:S781[农业科学—木材科学与技术]

 

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