Title :
An Annular Transducer with a Non Electronically Achieved Depth of Focus Ranging from 20 mm to 140 mm
Author :
Fink, M. ; Negreira, C.
Keywords :
Acoustic diffraction; Acoustic pulses; Acoustic transducers; Amplitude modulation; Apertures; Delay; Filters; Geometry; Modulation coding; Speckle;
Conference_Titel :
1982 Ultrasonics Symposium
Conference_Location :
San Diego, CA, USA
DOI :
10.1109/ULTSYM.1982.197949
