UNSPECIFIED (2001) Ultrasonic tomographic imaging of an encased, highly attenuating solid medium. RESEARCH IN NONDESTRUCTIVE EVALUATION, 13 (3). pp. 131-152. ISSN 0934-9847

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Abstract

Ultrasonic tomographic imaging has been performed on a highly attenuating, filled, hydroxyl-terminated polybutadiene, cast into a steel case. The detection of defects and the characterization of solid rocket propellant were thus possible. Extremely low signal levels due to the attenuation and scattering properties of the polymer were present. In addition, a nonideal tomographic reconstruction geometry was present, because of a cylindrical air-filled cavity in the center of the polymer. Complications also arose from high-amplitude guided waves within the steel case, which tended to mask directly transmitted signals through the propellant. These problems were solved using specially designed transducers and pulse-compression signal processing techniques. Modifications to the filtered back-projection reconstruction procedure were made to account for the discontinuity caused by the hole. Images are presented showing the detection of an artificial defect to demonstrate the technique.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Journal or Publication Title:	RESEARCH IN NONDESTRUCTIVE EVALUATION
Publisher:	SPRINGER-VERLAG
ISSN:	0934-9847
Date:	September 2001
Volume:	13
Number:	3
Number of Pages:	22
Page Range:	pp. 131-152
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/11522

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