Accession Number : ADA307795

Title :   Ferroelectric Nylon-7, -11 Ultrasonic Transducer Performance.

Descriptive Note : Technical rept.,

Corporate Author : RUTGERS - THE STATE UNIV NEW BRUNSWICK NJ DEPT OF CHEMICAL AND BIOCHEMICAL E NGINEERING

Personal Author(s) : Brown, L. F. ; Mason, J. L. ; Khataniar, D. ; Scheinbeim, J. I. ; Newman, B. A.

PDF Url : ADA307795

Report Date : APR 1996

Pagination or Media Count : 6

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.

Descriptors :   *ULTRASONICS, *ELECTROACOUSTIC TRANSDUCERS, COMPUTERIZED SIMULATION, NONDESTRUCTIVE TESTING, PERFORMANCE(ENGINEERING), NYLON, DIELECTRIC PROPERTIES, RESONANT FREQUENCY, ECHOES, BROADBAND, INSERTION LOSS, FERROELECTRIC MATERIALS, ACOUSTIC PROPERTIES, CURVE FITTING.

Subject Categories : Acoustic Detection and Detectors
      Medical Facilities, Equipment and Supplies

Distribution Statement : APPROVED FOR PUBLIC RELEASE