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Institut für Wasser- und Umweltsystemmodellierung - IWS



"Application of Fuzzy Logic to Signal Processing of Ultrasound Measurement"

In the presented paper a digital filter based on Fuzzy Logic is applied to ultrasound data from through transmission and acoustic emission measurements from timber and glued laminated timber (glulam) specimens of structural dimensions. It could be shown that the adopted filtering technique was able to reduce random noise efficiently and the level of interfering artefacts or phase shifts could be kept very low. For transmission measurements a significant reduction of repetitions has been achieved, which are necessary to reach reasonably high signal-to-noise ratios. For acoustic emission (AE) measurements the noise reduction worked most efficiently in the high frequency domain. From the preliminary AE results one can expect that the fuzzy filter can increase the ratio of events suitable for evaluation of source locations.