RT Journal Article
SR Electronic
T1 Detection of Decay in Trees With the Metriguard Stress Wave Timer
JF Arboriculture & Urban Forestry (AUF)
JO JOA
FD International Society of Arboriculture
SP 374
OP 378
DO 10.48044/jauf.1993.058
VO 19
IS 6
A1 Claus G. Mattheck
A1 Klaus A. Bethge
YR 1993
UL http://auf.isa-arbor.com/content/19/6/374.abstract
AB The Metriguard Stress Wave Timer measures the time needed for a stress wave to pass from a hammer blow to a sensor on the opposite side of the stem. A calculated sound speed will indicate decayed or hollow spots within the stem. A table of velocities for healthy trees is given and also some examples showing cross-sections of trees containing defects together with the measured velocities.