| 摘要 |
Apparatus for determining the velocity, V, or some function of V, of an impact induced vibration in a stem, log, or board is disclosed. A conveyor advances logs longitudinally to sequentially present an end of each log to an impact zone. An impact arm carrying an impact head is able to be cyclically swung into, and retrieved from, the impact zone. The impact head strikes the end of the log and a sensor detects the spectrum of the longitudinal vibration caused by the impact, and a processor can use this spectrum to determine the velocity of the vibrational response.
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