應用應力波斷面影像法評估香杉鼠害立木材質

Evaluation of Squirrel-Damage to Standing Trees of Luanta Fir by Stress-Wave-Based Tomography

林振榮(Cheng-Jung Lin) ； 邱志明(Chih-Ming Chiu) ； 楊德新(Te-Hsin Yang) ； 唐盛林(Sheng-Lin Tang) ； 王松永(Song-Yung Wang)

《台灣林業科學》 20卷3期 (2005/09) Pp. 259-264

https://doi.org/10.7075/TJFS.200509.0259

摘要

本研究使用Arbotom儀器呈現2D影像的斷面影像法，進行非破壞性香杉立木的孔洞、腐朽及缺點等材質評估，結果得知，在立木斷面中決定缺點的存在、大小及位置是可能的，在分析評估法的基礎下，從建立在立木樹幹上所設置的六個轉換器，實施測定應力波傳播時間（或速度）的結果，可以廣泛地進行相關試驗分析，比較相同部位的樹木及圓盤橫斷面之斷面影像，觀察應力波速度降低及顏色轉變的結果，以評估木材的劣化缺點，其木材缺點可以快速且有效地加以確認，所以，此法可以提供作為一種有價值的工具及技術，實施在危險樹木，老樹或大徑造林木疏伐選木為對象，評估材質及後續經營管理之參據。

關鍵字

非破壞性試驗 ； 斷面影像 ； 應力波

並列摘要

In this study, acoustic tomography using the Arbotom tool provided a 2-D image. The method allows the nondestructive inspection of standing trees for cavities, rot, and defects. Determination of the presence, size, and location of defects in trees is possible. It is based on the simultaneous measurement of the transmission time (or velocity) of a stress wave by 6 transducers arranged around the stem. The stress-wave-based tomographic method was extensively tested by comparison of the tomogram with not only the cross section of trees cut after the measurements, but also with data from disks obtained in the same plane. Defects are identified as soon as the wood is sufficiently deteriorated to reduce the stress wave velocity and change the color Therefore, this method may become a valuable tool for hazard tree or plantation tree inspection, evaluation, and management.

並列關鍵字

nondestructive testing ； tomography ； stress wave