Ultrasonic tomographic imaging of an encased, highly attenuating solid medium
UNSPECIFIED. (2001) Ultrasonic tomographic imaging of an encased, highly attenuating solid medium. RESEARCH IN NONDESTRUCTIVE EVALUATION, 13 (3). pp. 131-152. ISSN 0934-9847Full text not available from this repository.
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|
|Official Date:||September 2001|
|Number of Pages:||22|
|Page Range:||pp. 131-152|
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