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Non Destructive Detection of Decay in Living Trees

Författare:
Publiceringsår: 2002
Språk: Engelska
Sidor:
Publikation/Tidskrift/Serie: Technical Report LUTEDX/(TEAT-7111)/1-15/(2002)
Volym: TEAT-7111
Dokumenttyp: Rapport
Förlag: [Publisher information missing]

Sammanfattning

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.

Nyckelord

  • Electrical Engineering, Electronic Engineering, Information Engineering

Övriga

Published
  • Electromagnetic theory-lup-obsolete

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