Non Destructive Detection of Decay in Living Trees
Författare
Summary, in English
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.
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.
Publiceringsår
2002
Språk
Engelska
Publikation/Tidskrift/Serie
Technical Report LUTEDX/(TEAT-7111)/1-15/(2002)
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Dokumenttyp
Rapport
Förlag
[Publisher information missing]
Ämne
- Electrical Engineering, Electronic Engineering, Information Engineering
Status
Published
Report number
TEAT-7111
Forskningsgrupp
- Electromagnetic theory