Wood and other article destroying insects, when feeding, induce vibrations in the article being destroyed which is monitored and amplified to an audible level. The vibratory sounds are then analyzed as by comparison with other records of known destructive insects to determine the probable species of...http://www.google.com.hk/patents/US4895025?utm_source=gb-gplus-share專利 US4895025 - Destructive insect induced vibration detector
