Title :
VF2/VF3 copolymer line hydrophone array for ultrasonic field characterization [of medical transducers]
Author :
Chan, H.L.W. ; Ramelan, A.H. ; Guy, I.L. ; Price, D.C.
Author_Institution :
CSIRO, Lindfield, NSW, Australia
Abstract :
Line hydrophones and a line hydrophone array for measuring the spatial and temporal characteristics of medical ultrasonic transducers have been fabricated using a polyvinylidene fluoride/trifluoroethylene (VF2/VF3) copolymer. Copolymer films are cast by melt extrusion onto fine wires (114-μm and 60-μm diameters). Fine wires are used in order to provide high spatial resolution in the ultrasonic field measurements. A saline bath is used as the ground electrode in poling the copolymer lines. The construction and performance of the line hydrophones and the 23-element line hydrophone array are reported. As the output of a line hydrophone is proportional to the line integral of the acoustic pressure, a computer-tomographic technique is used to reconstruct the pressure profiles. The beam profile of a hyperthermia transducer has been measured
Keywords :
acoustic intensity measurement; biomedical equipment; biomedical ultrasonics; hydrophones; polymer blends; polymer films; radiation therapy; ultrasonic measurement; ultrasonic transducers; beam profile; computer-tomographic technique; copolymer line hydrophone array; hyperthermia transducer; medical ultrasonic transducers; performance; polyvinylidene fluoride/trifluoroethylene; pressure profiles; spatial characteristics; temporal characteristics; ultrasonic field characterization; Acoustic beams; Acoustic measurements; Electrodes; Sonar equipment; Spatial resolution; Structural beams; Ultrasonic transducer arrays; Ultrasonic transducers; Ultrasonic variables measurement; Wires;
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
DOI :
10.1109/ULTSYM.1990.171381
