Abstract：
:In ultrasonic non-destructive testing of materials with a coarse-grained structure the scattering from the grains causes backscattering noise, which masks flaw echoes in the measured signal. Several filtering methods have been proposed for improving the signal-to-noise ratio. In this paper we present a comparative study of methods based on the wavelet transform. Experiments with stationary, discrete and wavelet packet de-noising are evaluated by means of signal-to-noise ratio enhancement. Measured and simulated ultrasonic signals are used to verify the proposed de-noising methods. For comparison, we use signal-to-noise ratio enhancement related to fault echo amplitudes and filtering efficiency specific for ultrasonic signals. The best results in our setup were achieved with the wavelet packet de-noising method.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Matz V,Smid R,Starman S,Kreidl Mdoi
10.1016/j.ultras.2009.05.010subject
Has Abstractpub_date
2009-12-01 00:00:00pages
752-9issue
8eissn
0041-624Xissn
1874-9968pii
S0041-624X(09)00069-9journal_volume
49pub_type
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