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 1.

Effect of frequency on P wave velocity on increment cores measured at 80 kHz and 2 MHz [4].

		P wave velocity on
Statistical parameters	Units	increment cores (m/s)
		V_LL	V_RR	V_TT
Average	80 kHz	4150	1949	1462
	2 MHz	4685	1949	931

Difference	%	11	9	36

Coefficient of variation	80 kHz	0.0682	0.0518	0.0395
	2 MHz	0.0765	0.0498	0.0618

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