News: Tree Doctor Air in RRI Thursday, January 15, 2015

Tree Doctor Air in RRI Thursday, January 15, 2015
Posted by admin on 19 January 2015
The tragedy of the falling tree that has recently caused human deaths in Bogor Botanical
Gardens becomes a concern of many parties, including Bogor Agricultural University (IPB). “I
personally feel concerned over and express condolences for the victims,” said a researcher
of Department of Forest Products, Faculty of Forestry, Dr. Lina Karlinasari in a broadcast on
RRI Bogor, Jln Pangrango, Tuesday (13/1). The live broadcast hosted by broadcaster
Hadiyanto Lulu was also attended by the Director of Research and Innovation Prof. Dr.
Iskandar Z. Siregar.
Dr. Lina said, such a disaster could have been avoided if we had examined the tree. Checking
of a tree condition is to determine its health or damage, maintain its condition, anticipate its
potential fall or collapse, and estimate the strength properties of wood in the tree.
Check-up of a tree condition can be done in two ways: namely visually and by using
technology. The first method is the most basic, simplest, and most common activities to
determine the health, damage, and fitness of a trees. It is directed to identify and assess signs
and symptoms existing in the tree.
Visual examination is conducted on all parts of the tree starting from roots, main stems,
branches, leaves, and canopy. This also includes an evaluation of surrounding environment
where the tree is growing. However, it has limitations; among others, it can not predict the
inside condition of the tree stem.
The use of technology refers to a non-destructive testing / evaluation (NDT / NDE). The NDT
technology commonly used to detect the condition of the tree is based on the speed of sound
wave propagation (acoustic) and resistance drilling. The principle of acoustic-based
technology is that sound waves are propagated into a material, on which the sound would
travels faster through solid wood (intact) compared to rotten wood. The technology currently
developed is the acoustic tomography technology, known as sonic tomography.
Sonic Tomography is used to determine the inner condition of a tree based on the colored
image resulting from the velocity matrix of the sound waves propagating in the inside of the
wood. Resistance drilling technology is for displaying wood density changes associated with
the damage to the inside of wood. Changes in amplitude on the graph in the instrument shows
the variation of wood density due to the decays and cracks on the inside of the tree. NDT
technology is recommended to predict the internal condition of the tree which is often
undetected through the visual evaluation. (Mtd).
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