Multi-Frequency Electrical Impedance Measurement on a Wooden Disc Sample

Non-invasive measurement techniques are widely used for the investigation of living tree and wood material. Principles and methods from other fields of science form the basis of these techniques. Electrical impedance measurement, which is adopted mainly from applied geophysics, plays an important ro...

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Published inActa silvatica & lignaria Hungarica Vol. 11; no. 2; pp. 153 - 162
Main Authors Vizvár, Zoltán, Kiss, Tibor, Máthé, Kálmán, Odry, Péter, Vér, Csaba, Divós, Ferenc
Format Journal Article
LanguageEnglish
Published De Gruyter Open 01.12.2015
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Summary:Non-invasive measurement techniques are widely used for the investigation of living tree and wood material. Principles and methods from other fields of science form the basis of these techniques. Electrical impedance measurement, which is adopted mainly from applied geophysics, plays an important role in the investigation of living trees and wood material. Unlike other measurement techniques that provide mainly physical information, electrical impedance measurement is able to gather either physical or chemical information. There are several published accounts of the use of Electrical Impedance Tomography mainly for examining internal decay, estimation of sapwood, and heartwood width. The advantages of the method are its low costs and rapid execution; however, low spatial resolution is still one of the most glaring limits of the method. Use of a new, self-developed, high resolution measurement system provides new opportunities to gain better insights into the characterisation of wood material. As well as high accuracy and resolution, the measurement system is able to operate in a wide frequency range. This expands the examined parameters making it possible to extend the gained information and develop new methods for the investigation of living trees and wood material. The aim of our publication is to introduce some experimental results in the investigation of spatial resolution our system measured on a wooden disc. Fakorongok multi-frekvenciás elektromos impedancia mérése. Az előfak es faanyagok vizsgalatahoz kulonboző merestechnikai eljarasokat alkalmaznak. Ezek alapjat elsősorban mas tudomanyteruletekről hozott elvek es modszerek kepezik. Az elektromos ellenallas (impedancia) meres, melyet a geofizikai gyakorlatbol adoptaltak, ezek kozott nem kevesbe fontos szerepet tolt be, ugyanis mig a meresi modszerek tobbsege szerkezeti, fizikai informaciot szolgaltat, addig az elektromos modszerek a fizikai mellett kemiai informacioszerzesre is alkalmasak. Az Elektromos Impedancia Tomografiat tobb izben publikaltak előfak eseteben uregek, illetve szijacs es geszt vastagsag becslesre. Bar a meresi eljaras előnyei koze sorolhato a relativ alacsony koltsegigeny es gyorsasag, osszevetve azonban mas kepalkoto eljarasokkal, a kisebb terbeli felbontas szab hatart az egyes alkalmazasok elterjedesenek. Egy uj, sajat fejlesztesű nagy felbontokepessegű merőeszkoz alkalmazasa uj lehetősegeket nyujthat a felbontas javitasaban es a faanyag jellemzeseben. A merőeszkozre jellemző, hogy a nagy pontossagu es felbontokepessegű mereseket igen szeles frekvencia-tartomanyban kepes kivitelezni. Ez egy uj dimenziot nyit meg az előfa es faanyag vizsgalat modszertanaban, mely egy uj meresi eljaras fejleszteset alapozhatja meg. Jelenlegi publikacionk celja merőeszkozunk terbeli felbontasanak kiserleti ellenőrzese faanyagon.
ISSN:1787-064X
1787-064X
DOI:10.1515/aslh-2015-0012