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Non Destructive Detection of Decay in Living Trees

Larsson, Bertil LU ; Bengtsson, Bengt A LU and Gustafsson, Mats LU (2002) In Technical Report LUTEDX/(TEAT-7111)/1-15/(2002) TEAT-7111.
Abstract
It is shown that four point resistivity measurements can be used to detect

decay in living trees. A low frequency alternating current is injected into

the trunk and the induced voltage is measured between two points along the

trunk. With additional measurement of the cross section area, the effective

resistivity of the trunk is estimated. A comparison within a group of trees

shows that trees in decay have approximately a factor of two lower effective

resistivity than sound trees. The method is tested on several different groups

of spruce (Picea abies); in total more than 300 trees are examined. The tests

show that the method can detect decay caused by Heterobasidion... (More)
It is shown that four point resistivity measurements can be used to detect

decay in living trees. A low frequency alternating current is injected into

the trunk and the induced voltage is measured between two points along the

trunk. With additional measurement of the cross section area, the effective

resistivity of the trunk is estimated. A comparison within a group of trees

shows that trees in decay have approximately a factor of two lower effective

resistivity than sound trees. The method is tested on several different groups

of spruce (Picea abies); in total more than 300 trees are examined. The tests

show that the method can detect decay caused by Heterobasidion annosum

with high accuracy. Finite element modeling and simulations are used to

validate the method. (Less)
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in
Technical Report LUTEDX/(TEAT-7111)/1-15/(2002)
volume
TEAT-7111
pages
15 pages
publisher
[Publisher information missing]
language
English
LU publication?
yes
id
c289154f-c956-4bc0-8ffe-0edbbbf398c3 (old id 530531)
date added to LUP
2007-09-12 10:06:04
date last changed
2016-04-16 10:51:40
@misc{c289154f-c956-4bc0-8ffe-0edbbbf398c3,
  abstract     = {It is shown that four point resistivity measurements can be used to detect<br/><br>
decay in living trees. A low frequency alternating current is injected into<br/><br>
the trunk and the induced voltage is measured between two points along the<br/><br>
trunk. With additional measurement of the cross section area, the effective<br/><br>
resistivity of the trunk is estimated. A comparison within a group of trees<br/><br>
shows that trees in decay have approximately a factor of two lower effective<br/><br>
resistivity than sound trees. The method is tested on several different groups<br/><br>
of spruce (Picea abies); in total more than 300 trees are examined. The tests<br/><br>
show that the method can detect decay caused by Heterobasidion annosum<br/><br>
with high accuracy. Finite element modeling and simulations are used to<br/><br>
validate the method.},
  author       = {Larsson, Bertil and Bengtsson, Bengt A and Gustafsson, Mats},
  language     = {eng},
  pages        = {15},
  publisher    = {ARRAY(0x7dba438)},
  series       = {Technical Report LUTEDX/(TEAT-7111)/1-15/(2002)},
  title        = {Non Destructive Detection of Decay in Living Trees},
  volume       = {TEAT-7111},
  year         = {2002},
}