Non-destructive Detection of Knot in Sawn Timber Based on Air-Coupled Ultrasonic

JIANG Hao; LIN Lu-jun; ZHENG Hong-ping; ZHOU De-quan; FANG Yi-ming

doi:10.19455/j.mcgy.20190112

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Non-destructive Detection of Knot in Sawn Timber Based on Air-Coupled Ultrasonic
1. Jiyang College,Zhejiang A & F University
2. School of Information Engineering,Zhejiang A & F University
3. Zhejiang Provincial Key Laboratory of Intelligent Monitoring in Forestry and Information Technology
Vol. 33, Issue 1, Pages: 46-49(2019)
DOI： 10.19455/j.mcgy.20190112

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[1]蒋昊,蔺陆军,郑红平,周德全,方益明.基于空气耦合式超声波的锯材节子缺陷检测[J].木材工业,2019,33(01):46-49.

JIANG Hao, LIN Lu-jun, ZHENG Hong-ping, et al. Non-destructive Detection of Knot in Sawn Timber Based on Air-Coupled Ultrasonic. [J]. China Wood Industry 33(1):46-49(2019)
[1]蒋昊,蔺陆军,郑红平,周德全,方益明.基于空气耦合式超声波的锯材节子缺陷检测[J].木材工业,2019,33(01):46-49. DOI： 10.19455/j.mcgy.20190112.

JIANG Hao, LIN Lu-jun, ZHENG Hong-ping, et al. Non-destructive Detection of Knot in Sawn Timber Based on Air-Coupled Ultrasonic. [J]. China Wood Industry 33(1):46-49(2019) DOI： 10.19455/j.mcgy.20190112.

摘要

针对锯材的节子缺陷,基于空气耦合式超声波的传输系数与待测样本密度之间的关系,探索了空气耦合式超声波的节子缺陷检测新方法,并采用自行研制的空气耦合式超声波检测仪对杉木锯材试样进行检测,结果表明,空气耦合式超声波技术不仅能检测出锯材表面可见的节子缺陷,也可以有效检测不可见的内部节子缺陷。

Abstract

Based on relationship between transmission coefficient of air-coupled ultrasonic wave and wood density, a new testing method for knot defect detection was developed. Experiments for detecting defects of Chinese fir specimens were conducted using a self-developed air-coupled ultrasonic imaging instrument. Results showed that the new method could be used in detecting not only visible knots on lumber surfaces, but also invisible segment defects inside lumbers.

关键词

空气耦合式超声波木材无损检测节子缺陷C扫描成像

Keywords

Air-coupled ultrasonicnon-destructive testing of woodknot defectC-scan imaging

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