Title :
Improved imaging with multi-SAFT
Author :
Lorenz, M. ; van der Wal, L.F. ; Berkhout, A.J.
Author_Institution :
TNO Inst. of Appl. Phys., Delft, Netherlands
Abstract :
At the end of 1988 a research project was started to develop a practical, high-resolution imaging method for ultrasonic NDT (nondestructive testing) based on the synthetic aperture focusing technique (SAFT). It is demonstrated that multiple reflecting waves, interacting with a defect via the object boundaries, have to be included in the SAFT algorithm. The improved imaging method is referred to as Multi-SAFT. A fast calculation scheme for computing indirect wavepaths in cylindrical objects is presented. The data-acquisition method is described, and a number of modeled and experimental imaging results are given, illustrating the considerable improvements of the images obtained when applying Multi-SAFT
Keywords :
flaw detection; ultrasonic materials testing; SAFT algorithm; cylindrical objects; data-acquisition method; defect; fast calculation scheme; high-resolution imaging method; indirect wavepaths; multi-SAFT; multiple reflecting waves; object boundaries; synthetic aperture focusing technique; ultrasonic nondestructive testing; Apertures; Diffraction; Focusing; High-resolution imaging; Image resolution; Physics; Reflection; Signal processing; Signal resolution; Transducers;
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
DOI :
10.1109/ULTSYM.1990.171537
