Japanese

2002

A Long-term Observation of Activity of Coptotermes formosanus in The Nest under The Bathroom by Continuous Acoustic Emission (AE) and Temperature Monitoring

The temperature in the environment or in termite nests affects the termite activities. In order to evaluate the effects of temperature on the activity of Coptotermes formosanus SHIRAKI, acoustic emission (AE) monitoring was applied to the nest under the bathroom. Temperatures were continuously measured for about one year using thermocouples at four points, the centre of the nest, the periphery of the nest, the environment around the nest, and the underground. AEs were detected at the centre of nest and at the wooden construction member near the nest in the wooden house. The nest was periodically stimulated by drawing and inserting the wave-guides.



Fig. 1. AE monitoring and temperature measurements of nest in the underground nest under a wooden house.




Fig. 2. Relationships between AEs and temperatures in the underground nest under a house.
Arrows show the stimulation by drawing and inserting the pole inserted from the floor of bathroom.




Fig. 3. Relationships between AEs and stimulations in the underground nest.
Arrows show the stimulation by drawing and inserting the pole inserted from the floor of bathroom.



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