Title :
VF2/VF3 copolymer hydrophone for ultrasonic power measurements
Author :
Chan, H.L.W. ; Ramelan, A.H. ; Guy, I.L. ; Price, D.C.
Author_Institution :
CSIRO, Div. of Appl. Phys., Lindfield, NSW, Australia
Abstract :
Hydrophones to be used in the characterization of medical ultrasonic transducers have been fabricated using a new polyvinylidene fluoride-trifluoroethylene (VF2-VF3) copolymer. The copolymer has an advantage over VF2 in that it does not require prestretching before poling. Thin copolymer films can be cast from solution and then poled using the corona discharge method. As there is a need for small-diameter hydrophones to provide good spatial resolution in measuring highly focused ultrasonic beams, hydrophones with diameter as small as 0.1 mm have been made. Both needle-type and line hydrophones have been tested and their performance reported. In the case of line hydrophones, the output signal is proportional to the line integral of the acoustic pressure, and a computer-tomographic technique was used to reconstruct the beam profiles
Keywords :
biomedical ultrasonics; computerised tomography; hydrophones; polymer blends; ultrasonic measurement; ultrasonic transducers; PVDF-TFE; acoustic pressure; beam profiles; computer-tomographic technique; copolymer films; copolymer hydrophone; corona discharge method; highly focused ultrasonic beams; line hydrophones; line integral; medical ultrasonic transducers; needle-type; output signal; polyvinylidene fluoride-trifluoroethylene; small-diameter hydrophones; ultrasonic power measurements; Corona; Crystallization; Electrodes; Needles; Optical fiber polarization; Power measurement; Sonar equipment; Temperature; Ultrasonic variables measurement; Wire;
Conference_Titel :
Ultrasonics Symposium, 1989. Proceedings., IEEE 1989
Conference_Location :
Montreal, Que.
DOI :
10.1109/ULTSYM.1989.67057
