Wavelet cycle-spinning denoising of ultrasonic traces acquired from austenitic steel

Author

Emeterio, Jose Luis San ; Pardo, Emilia ; Rodriguez, Miguel Angel

Author_Institution

Dept. Signals Syst. & Ultrasonic Technol., Consejo Super. Investig. Cientificas (CSIC), Madrid, Spain

fYear

2009

fDate

20-23 Sept. 2009

Firstpage

1992

Lastpage

1995

Abstract

Ultrasonic non-destructive evaluation of austenitic steel components or welded unions usually presents difficulty for small flaw detection, due to complex structure and wave scattering at grain boundaries. Ultrasonic signals from small flaws are masked by grain or structural noise whose frequency band partially overlaps the frequency response of the ultrasonic transducer. The main objective of this work is the application and performance analysis of a cycle-spinning undecimated wavelet transform processor for denoising ultrasonic traces acquired from a test block made of austenitic steel.

Keywords

acoustic noise; acoustic signal processing; austenitic steel; flaw detection; grain boundaries; signal denoising; ultrasonic materials testing; ultrasonic transducers; wavelet transforms; austenitic steel component; austenitic steel welded union; cycle-spinning undecimated wavelet transform processor; flaw detection; grain boundaries; grain noise; masking; structural noise; ultrasonic denoising; ultrasonic nondestructive evaluation; ultrasonic transducer; wave scattering; Frequency response; Grain boundaries; Noise reduction; Performance analysis; Scattering; Steel; Ultrasonic transducers; Wavelet analysis; Wavelet transforms; Welding; Denoising; Grain noise reduction; Ultrasonics; Wavelets;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium (IUS), 2009 IEEE International

Conference_Location

Rome

ISSN

1948-5719

Print_ISBN

978-1-4244-4389-5

Electronic_ISBN

1948-5719

Type

conf

DOI

10.1109/ULTSYM.2009.5442054

Filename

5442054