Abstract
This experiment was made to detect defects in pine timbers and to examine the effectiveness of the impact excitation method by analysing the emission of elastic waves. We used the moving average method to extract a characteristic waveform from the original waveform for defect free timber and timbers with artificially produced defects of half drilled or drilled-through holes. From the moving average waveform, graphs of the discrimination between the presence and absence of defects were made. These graphs showed a rate of discrimination of 85.2%.
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