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1998
Acoustic emission (AE) monitoring for the nondestructive detection of termite attack in wood was applied to a house of wooden panel construction attacked by Coptotermes hormosanus Shiraki. AE monitoring was applied to the floor- or the wall-panel around the bathroom and the entrance porch. AE sensors with resonant frequency of 150kHz were attached directly to the surface of floor joints, which were the construction members of floor flame and were made of dimensional numbers whose cross section was 37mm by 87mm in square. For the measurement of AEs generated in the studs of the wall panel, the AE sensor was attached using a needle-type sensor holder, which plays a role of a waveguide penetrating through the wall covering made of plaster board and wall paper. Significant numbers more than 10 of AEs were detected from the floor- and wall-panels around the bathroom and the entrance porch. By boring and disassembling near the AE detection points apart, galleries or termites were found and the positions where significant number of AEs were detected almost corresponded to the positions where termites were attacking.
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