Title :
Frequency and temperature dependence of acoustic properties of polymers used in pulse-echo systems
Author :
Carlson, J.E. ; van Deventer, J. ; Scolan, A. ; Carlander, C.
Author_Institution :
Dept. of Comput. Sci. & Electr. Eng., Lulea Univ. of Technol., Sweden
Abstract :
In ultrasonic pulse-echo systems, polymers like PMMA (polymethylmethacrylate) and PEEK (polyetheretherketone) are often used as buffer-rods, placed between the ultrasound transducer and the unknown material (liquid, gas, or solid material). Provided the acoustic properties of the buffer-rods are known, it is possible to calculate these also for the unknown material, based on reflections between the buffer-rod and the unknown medium. However, temperature changes also affect these properties. In this paper we present a method for measuring acoustic attenuation, speed of sound and density, for buffer-rod materials. We also give experimental values for PMMA and PEEK, for temperatures between 5°C and 37°C, and for 5 MHz and 10 MHz ultrasound frequency.
Keywords :
acoustic wave absorption; polymers; 10 MHz; 5 MHz; 5 to 37 degC; PMMA; acoustic attenuation measurement; acoustic properties; buffer-rod materials; frequency dependence; polymers; temperature dependence; ultrasonic pulse-echo systems; ultrasound transducer; Acoustic materials; Acoustic pulses; Acoustic reflection; Acoustic transducers; Frequency; Polymers; Solids; Temperature dependence; Ultrasonic imaging; Ultrasonic transducers;
Conference_Titel :
Ultrasonics, 2003 IEEE Symposium on
Print_ISBN :
0-7803-7922-5
DOI :
10.1109/ULTSYM.2003.1293541
