Detection of termite attack in wood using acoustic emission
Y Fujii, M Noguchi, Y Imamura, M Tokoro
Acoustic emission (AE) is the elastic wave produced by the strain energy released in the process of fracture of a material and propagates through it. The object of this report is to detect AEs produced by the termite activities and to evaluate the possibility of using an AE monitoring test to nondestructively detect the termite attack in wood. It was revealed that AEs were detected from the specimens under termite-attack and the rate of AE events increased according to the number of the inhabiting termites. As no AE was detected from the specimens with soldiers only, it was assumed that workers should generate AEs through feeding activities. It was also revealed that the distribution of AE sources corresponded to that of the region attacked by termites in the specimen.
Keywords: ACOUSTIC EMISSION; DISTRIBUTION OF AE SOURCES; TERMITE ATTACK; COPTOTERMES; DETECTION; MICRO-FRACTURE; NON-DESTRUCTIVE TESTING; TERMITES