Wood moisture gradient analysis by electrical impedance spectroscopy

M. Tiitta, T. Savolainen, H. Olkkonen, Tapio Kanko

Research output: Contribution to journalArticleScientificpeer-review

19 Citations (Scopus)

Abstract

An electrical impedance frequency spectrum (20Hz to 1MHz) was measured in wood specimens with uniform, absorption and desorption transverse moisture content (MC) gradient. Parallel plate single sided capacitive and conductive electrodes were used. Capacitance, conductance and impedance locus analyses were included in the study, the desorption and absorption moisture gradients (MG) were estimated using frequency based analysis. This study suggests that the transverse MG can be estimated using impedance spectroscopy analysis. Both used electrode types and all the studied methods gave similar results which shows that frequency based analysis can be used. It was not possible to achieve very good accuracy when estimating MG using pure conductive or capacitance measurement method. The electrical distributed network circuit modelling was found to be the most promising method in estimation of transverse MG.
Original languageEnglish
Pages (from-to)68-76
Number of pages7
JournalHolzforschung
Volume53
Issue number1
DOIs
Publication statusPublished - 1999
MoE publication typeA1 Journal article-refereed

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Acoustic impedance
Wood
Moisture
Spectroscopy
Desorption
Electrodes
Capacitance measurement
Capacitance
Networks (circuits)

Cite this

Tiitta, M., Savolainen, T., Olkkonen, H., & Kanko, T. (1999). Wood moisture gradient analysis by electrical impedance spectroscopy. Holzforschung, 53(1), 68-76. https://doi.org/10.1515/HF.1999.012
Tiitta, M. ; Savolainen, T. ; Olkkonen, H. ; Kanko, Tapio. / Wood moisture gradient analysis by electrical impedance spectroscopy. In: Holzforschung. 1999 ; Vol. 53, No. 1. pp. 68-76.
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Tiitta, M, Savolainen, T, Olkkonen, H & Kanko, T 1999, 'Wood moisture gradient analysis by electrical impedance spectroscopy', Holzforschung, vol. 53, no. 1, pp. 68-76. https://doi.org/10.1515/HF.1999.012

Wood moisture gradient analysis by electrical impedance spectroscopy. / Tiitta, M.; Savolainen, T.; Olkkonen, H.; Kanko, Tapio.

In: Holzforschung, Vol. 53, No. 1, 1999, p. 68-76.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Tiitta, M.

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AU - Olkkonen, H.

AU - Kanko, Tapio

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AB - An electrical impedance frequency spectrum (20Hz to 1MHz) was measured in wood specimens with uniform, absorption and desorption transverse moisture content (MC) gradient. Parallel plate single sided capacitive and conductive electrodes were used. Capacitance, conductance and impedance locus analyses were included in the study, the desorption and absorption moisture gradients (MG) were estimated using frequency based analysis. This study suggests that the transverse MG can be estimated using impedance spectroscopy analysis. Both used electrode types and all the studied methods gave similar results which shows that frequency based analysis can be used. It was not possible to achieve very good accuracy when estimating MG using pure conductive or capacitance measurement method. The electrical distributed network circuit modelling was found to be the most promising method in estimation of transverse MG.

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