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The influence of stem thickness and artificially made defects (drill holes and cracks of different sizes) was tested in spruce for sound velocity using two different instruments;an Impulshammer with 300 Hz and a BP 5 with 50 kHz). Comparative drilling resistance was measured with a Resistograph 1410, and we were able to identify very small defects.

schweizerische zeitschrift für forstwesen/schweizerische zeitschrift f[ü]r forstwesen

Die Eignung von Schallgeschwindigkeit und Bohrwiderstand zur Beurteilung von simulierten Defekten in Fichtenholz | Use of sound velocity and drilling resistance to evaluate simulated defects in Norway spruce