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 wood
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 waterlogged wood
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 specimen