چکیده مقاله
A signal processing technique is presented for significantly sharpening the resolution of ultrasonic B scan images, similar to those acquired in the nondestructive evaluation of girth welds in oil/gas pipelines This enhancement allows a much improved estimate of the exact size of any detected anomaly in the weld, such that fracture mechanics can be used to gauge the probability of weld failure The algorithm is based on the synthetic aperture focusing technique SAFT , combined with a variation of Weiner filtering and autoregressive spectral extrapolation An analytical model of the transducer is used to construct an appropriate reference spectrum for the deconvolution operation, and accounts for the dependence of a beam’s frequency spectrum on the position of a flaw relative to the transmitter Simple experimental results are used to provide an estimate of the improvement in flaw sizing accuracy
کلیدواژهها
نویسندگان
A.N Sinclair
Professor and chair, Mechanical and Industrial Engineering, University of Toronto
J.G Fortin
Master’s student, Mechanical and Industrial Engineering, University of Toronto
F Honarvar
Associate Professor, Mechanical Engineering, K N Toosi University of Technology, Tehran
M Jastrzebski
Master’s student, Mechanical and Industrial Engineering, University of Toronto
شیوه ارجاع
Sinclair, A.N and Fortin, J.G and Honarvar, F and Jastrzebski, M,1384,Enhancement of Ultrasonic Bscan Images for Sizing of Defects by Time-of-Flight Diffraction,01st Tehran International Congress on Manufacturing Engineering (TICME2005),Tehran
ارائهشده در
مجموعه مقالات اولین کنفرانس بین المللی و هفتمین کنفرانس ملی مهندسی ساخت و تولید1 فروردین 1384 · تهران