Detection of Acoustic Emission(AE) from Waterlogged Wood Treatment
AE monitoring was applied to detect the generation of the defects in the wood
Detection of AEs from air dryingwaterlogged
AE wave generated from the air-drying small
specimen is detected by the needle(wave guide)
and transmitted to the sensor. AEs are generated
by the pressure fluctuation by the transportation
of water between cells or by the friction
betwewn the needle and the tissues in shrinkage.
Detection of AE from small waterlogged specimen
in PEG treatment
AE wave generated from the specimen was detected
by the sensor attached to the bin surface
or by the sensor attached to the clamping
attachment of stainless steel.
Time change of AE event rate during PEG treatment
The weight and the length decreased by the
dehydration just after the increase of PEG
concentration, then increased by the absorption.
Larger number of AE events were detected
after the increase of PEG concentration.
AE monitoring in vacuum freeze drying of
AE was detected by the wave-guide of steel
wire(1mm in diameter and 200mm in length)
pierced into the specimen .
Temperature of the specimen was measured
by the thermocouples at the surface, 1cm
depth and in the middle, respectively.
Time change of AE event rate and temperature
in vacuum freeze drying of waterlogged wood
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