Title :
Optimisation of time reversal processing in titanium inspections
Author :
Miette, Véronique ; Sandrin, Laurent ; Wu, François ; Fink, Mathias
Author_Institution :
Lab. Ondes et Acoust., Paris VII Univ., France
Abstract :
Over the past two years, advances in using the time reversal technique for titanium inspection have been made. Several improvements were developed for the detection of small defects located in the center of large titanium billets. We have conceived a very efficient refocusing process in the receive mode that combines the signals of the first and second time-reversed iterations. We will also show how an optimal choice of the first illumination beam can greatly improve the detection of small defects in deep zones
Keywords :
acoustic signal processing; flaw detection; inspection; iterative methods; matched filters; titanium; ultrasonic focusing; ultrasonic materials testing; ultrasonic transducer arrays; Ti; Ti inspection; deep zones; first illumination beam; iterative coherent summation; iterative matched filter technique; large titanium billets; receive mode; refocusing process; signal combination; small defect detection; time reversal processing optimisation; transducer array; Billets; Frequency; Geometry; Inspection; Lighting; Matched filters; Prototypes; Signal processing; Titanium; Ultrasonic transducer arrays;
Conference_Titel :
Ultrasonics Symposium, 1996. Proceedings., 1996 IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-3615-1
DOI :
10.1109/ULTSYM.1996.584058
