Development of Tomographic Technology (Case Study: Trees from Karaj City)

• Main Authors: Mehran Roohnia, Ahmad Jahanlatibari, Behzad Behnam, Jamshid Zarrinmehr, Mostafa Kohantorabi, Negin Manouchehri, Ajang Tajdini
• Format: Article
• Language: fas
• Published: Regional Information Center for Science and Technology (RICeST) 2018-03-01
• Series: تحقیقات علوم چوب و کاغذ ایران
• Subjects: Defect; Tomography; Tree; Sound Velocity; Collar; WOOD
• Online Access: http://ijwpr.areeo.ac.ir/article_115142_4f1a12db25b96c621694774fab849d06.pdf

Reaching to the technology of acoustical Tomography and imaging, this project was ordered for facilitating the work for green space researchers and managers in urban standing trees. Comparing the sensors and micro-second timers with those of a certified European device in radial to tangential and longitudinal directions showed a good agreement for the Iranian made device. So, a new horizon was opened for the researchers of this approach supported by the local scientific knowledge and technology. Holding this technology, the selected trees concerning the collar defect symptoms were firstly inspected visually, then the visual accuracy was monitored by sonic tomography. Some trees were extremely defected internally, while the visual inspection showed their intactness (9 from 23). Meanwhile some trees holding visually defect signs were proved to be intact after carrying the tomography images (up to 10 from 53). It is concluded that the visual tree defect inspection is not satisfactory for saving or omitting the individual and these kinds of decision makings must be supported by the methods showing the hidden discontinuities.