Title :
Electronic scanning in ultrasonic imaging using a wedge transducer
Author :
Germain, L. ; Cheeke, J. David N
Author_Institution :
Dept. de Phys., Sherbrooke Univ., Que., Canada
fDate :
3/1/1993 12:00:00 AM
Abstract :
The position-dependent resonant frequency of a wedge transducer is used to obtain electronic scanning of an ultrasonic beam by varying the frequency. A theoretical calculation of the resolution using the staircase model is in good agreement with the experiment. The principle has been applied to ultrasonic imaging both by combining the wedge transducer with a cylindrical lens and by direct emission into water. A higher resolution is obtained in the latter case, in agreement with the theory. Such a system is proposed as a rapid real-time imaging system for applications not requiring high resolution.<>
Keywords :
acoustic imaging; acoustic resonators; ultrasonic applications; ultrasonic materials testing; ultrasonic transducers; B-scan acoustic imaging; acoustic resonator theory; cylindrical lens; direct emission into water; edge detection; electronic scanning; insertion loss; position-dependent resonant frequency; rapid real-time imaging system; resolution; staircase model; step detection; ultrasonic imaging; wedge transducer; Acoustic imaging; High-resolution imaging; Image resolution; Lenses; Piezoelectric transducers; Real time systems; Resonance; Resonant frequency; Ultrasonic imaging; Ultrasonic transducers;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
