Development of an electrical impedance spectrometer for the analysis of wood transverse moisture gradient

M. Tiitta, T. Savolainen, Timo Lappalainen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    A low-cost impedance spectrometer prototype was developed for the analysis of wood transverse moisture gradient.The measurement of electrical impedance spectrum is based on a sine wave analysis using frequencies below 5 MHz.The equipment consists of a portable PC with an accumulator and electronics connected to a hand-held probe with coaxial and power cables.The equipment can be transferred easily in a small case.Because of the accumulators, no external electricity is needed, and hence, field measurements can be performed.In the measurement, parallel flat electrodes are pressed against the wood specimen.The method is based on modelling the electrical impedance of wood at and below the surface and on using model parameters to estimate the moisture gradient.The equipment and the method have been tested with many types of uniform, desorption and adsorption gradients.Lumber, pulpwood and log specimens of spruce, pine and birch have been used in the tests.
    Original languageEnglish
    Title of host publicationProceedings of 12th International Symposium on Nondestructive Testing of Wood
    Place of PublicationSopron
    Pages307 - 316
    Publication statusPublished - 2000
    MoE publication typeA4 Article in a conference publication
    Event12th International Symposium on Nondestructive Testing of Wood - Sopron, Hungary
    Duration: 13 Sep 200015 Sep 2000

    Conference

    Conference12th International Symposium on Nondestructive Testing of Wood
    Country/TerritoryHungary
    CitySopron
    Period13/09/0015/09/00

    Keywords

    • wood
    • timber
    • testing
    • analysis
    • properties
    • moisture
    • gradients
    • spectrometers
    • impedance
    • modelling
    • absorption
    • desorption

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