Ultrasound and Wood Science at the Forestry Research Centre in Nancy, France, for a period of twenty years, between 1979 and 1999

Topical Issue - Development of European Acoustics in 20th Century

Open Access

Table 21.

Acoustic invariants and the fungi attack in each anisotropic plane of wood [61].

Wood species	Treatment	Acoustic invariants
Wood species	Treatment	I₁₂	I₁₃	I₂₃	I average axis 1	I ratio
Beech	Initial	2933	2807	1492	2876	0.52
	After 5 months white rot	2634	2551	1133	2582	0.44
	Difference (%)	10	9	24	9	16

Pine	Initial	3262	3160	1480	3211	0.46
	After 5 months brown rot	2106	2034	726	2070	0.33
	Difference (%)	35	37	51	35	24

Notes.I average is calculated for I₁₂ and I₁₃ containing the axis 1 or axis L of wood.

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