METHOD AND SYSTEM FOR AUTOMATIC DETERMINATION OF TIMBER QUALITY IN FROZEN OR UNFROZEN CONDITION

摘要

An automatic sawmill sorting method and system for winter logs, which may or may not be frozen, determines actual log quality/strength, avoiding falsely classifying a frozen low quality log as a high quality log by utilizing, in addition to standard acoustic resonance measurement, microwave scanning to determine the presence or absence of microwave amplitude attenuation typical of unfrozen wood. An acoustic resonance measurement in the >600 Hz range can be halved when lack of attenuation indicates a frozen state.