Title :
Ferroelectric nylon-7,-11 ultrasonic transducer performance
Author :
Brown, L.F. ; Mason, J.L. ; Khataniar, D. ; Scheinbeim, J.I. ; Newman, B.A.
Author_Institution :
South Dakota State Univ., Brookings, SD, USA
Abstract :
Measurements of the high frequency electrical and acoustic properties of ferroelectric nylon 7 and 11 are reported for frequency and temperature ranges of interest for ultrasonic transducer applications in medicine and nondestructive testing. The dielectric properties of the samples were measured over a broadband frequency range (typically 1-100 MHz), including the fundamental half-wave resonance frequency for the sample, and the properties of interest for ultrasound transducer design were determined using a curve-fitting resonance technique. These properties were then used in a computer simulation program to assess the acoustic performance of nylon-based ultrasonic transducers and compare them with PVDF and P(VDF-TrFE) copolymer designs. Comparisons were carried out on the pulse-echo acoustic performance including pulse width, sensitivity, insertion loss, and bandwidth. Finally, a nylon ultrasound transducer was fabricated for pulse-echo acoustic performance measurements and comparison with PVDF. Tests verified the broadband acoustic performance of nylon 7
Keywords :
biomedical equipment; biomedical ultrasonics; ferroelectric devices; ultrasonic materials testing; ultrasonic transducers; 1 to 100 MHz; acoustic properties; bandwidth; broadband acoustic performance; computer simulation program; curve-fitting resonance technique; high frequency electrical properties; insertion loss; medical instrumentation; nylon 11; nylon 7; pulse width; pulse-echo acoustic performance; Acoustic measurements; Acoustic pulses; Acoustic transducers; Dielectric measurements; Ferroelectric materials; Frequency measurement; Resonance; Ultrasonic imaging; Ultrasonic transducers; Ultrasonic variables measurement;
Conference_Titel :
Ultrasonics Symposium, 1995. Proceedings., 1995 IEEE
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-2940-6
DOI :
10.1109/ULTSYM.1995.495785