Near field synthetic aperture ultrasonic imaging: non-destructive testing

Author

Silverstein, Seth D. ; Thomas, Lewis J.

Author_Institution

GE Corporate Res. & Dev., Schenectady, NY, USA

Volume

3

fYear

1992

fDate

23-26 Mar 1992

Firstpage

33

Abstract

The results of a detailed analytical study of the effects of sensor signal processing techniques on clutter suppression and image enhancement for nondestructive testing (NDT) systems are presented. In the analysis described, a relatively simple beamforming/diffraction model is developed for near-field, wideband, synthetic aperture ultrasonic imaging in NDT systems. The physical model is used to quantitatively evaluate a variety of front-end sensor signal processing tradeoffs for enhanced detection and sizing of defects. It is shown using statistical microscopic scattering calculations that a combination of increased spatial sampling and windowing can increase the signal-to-clutter ratio by ~17 dB while maintaining crack size resolutions well below future projected specifications

Keywords

acoustic imaging; acoustic signal processing; crack detection; image processing; ultrasonic materials testing; NDT; clutter suppression; crack detection; defects; front-end sensor signal processing tradeoffs; image enhancement; near field synthetic aperture US imaging; nondestructive testing; spatial sampling; ultrasonic imaging; windowing; Array signal processing; Diffraction; Image analysis; Image enhancement; Image sensors; Nondestructive testing; Sensor systems; Signal analysis; Signal processing; Ultrasonic imaging;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1992. ICASSP-92., 1992 IEEE International Conference on

Conference_Location

San Francisco, CA

ISSN

1520-6149

Print_ISBN

0-7803-0532-9

Type

conf

DOI

10.1109/ICASSP.1992.226283

Filename

226283