Accession Number : ADA302276

Title :   Wavelet Transform Signal Processing Applied to Ultrasonics.

Descriptive Note : Final rept.,

Corporate Author : ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS

Personal Author(s) : Abbate, A.

PDF Url : ADA302276

Report Date : MAY 1995

Pagination or Media Count : 29

Abstract : THE WAVELET TRANSFORM IS APPLIED TO THE ANALYSIS OF ULTRASONIC WAVES FOR IMPROVED SIGNAL DETECTION AND ANALYSIS OF THE SIGNALS. In instances where the mother wavelet is well defined, the wavelet transform has relative insensitivity to noise and does not need windowing. Peak detection of ultrasonic pulses using the wavelet transform is described and results show good detection even when large white noise was added. The use of the wavelet transform to extract the frequency dispersion relation of the IAmb wave velocity is also described. The two-dimensional wavelet transform allows for both time and frequency analysis, thus making it particularly suitable for dispersion studies. Experimental and numerical results show the superior performance of the wavelet transform signal processor. (AN)

Descriptors :   *SIGNAL PROCESSING, *ULTRASONICS, MATHEMATICAL MODELS, COMPUTERIZED SIMULATION, FOURIER TRANSFORMATION, TIME DEPENDENCE, SIGNAL TO NOISE RATIO, ANGLE OF ARRIVAL, WHITE NOISE, ACOUSTIC DETECTION, GROUP VELOCITY, CORRELATION, ECHOES, WAVE PROPAGATION, ACOUSTIC SIGNALS, NOISE REDUCTION, SOUND WAVES, MATCHED FILTERS, ACOUSTIC VELOCITY, BANDPASS FILTERS, DISPERSION RELATIONS, FREQUENCY SHIFT.

Subject Categories : Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE