Arboriculture & Urban Forestry · 1993 · 30 citations · 0 references
Natural ResourcesForestryMechanical EngineeringAcousticsCondition AssessmentForest BiometricsAcoustic LoggingStand MeasurementTree MeasurementVibration MonitoringWood DecayWood Decay AssessmentDecay Progression MonitoringDecay RatesDecay Time AnalysisSound Speed EstimationSpeed Of SoundStem Decay AssessmentStress Wave AnalysisStress Wave Propagation
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.