Feuchtigkeit, Sorption, Quellung und Kapillarkondensation von Holz

Kollmann, Franz

doi:10.1007/978-3-642-49758-2_16

Cited by 1 publication

(1 citation statement)

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“…Furthermore, small differences between the two results could result from differing moisture contents at which the two measurements were performed. According to the literature the moisture content affects dielectric properties (Kollmann 1982;Khalid et al 1999) as weIl as X-ray results (Schweinguber et al 1978).…”

Section: Resultsmentioning

confidence: 99%

High-Frequency Densitometry-A New Method for the Rapid Evaluation of Wood Density Variations

Schinker¹,

Hansen²,

Spiecker³

2003

IAWA J

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A new method called HF-densitometry is introduced, which measures relative density variations along wood surfaces utilizing the dielectric properties ofwood. The method is based on the propagation of continuous electromagnetic waves in a high-frequency (HF) transmitter-receiver link of an extremely small electrode system, which is in direct contact with the wood surface investigated. The electromagnetic field emitted by the transmitting electrode propagates through a small volume of the wood sampie to the receiving electrode, located very close to the transmitting electrode. The received signal strength is directly influenced by the dielectric properties of the material along the propagation path. The variation of the relative dielectric constant in different wood structures is correlated with the density variations in a way the received signal strength increases with increasing wood density. The dielectric measuring device, developed on the basis of the new method, allows non-destructive, extremely fast measurements of wood density variations . The new HF-densitometry method was compared to X-ray densitometry by performing measurements on an identical spruce sampie.

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Section: Resultsmentioning

confidence: 99%