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Temperature effects on ultrasonic phase velocity and attenuation in Eccosorb and PMMA

Temperature effects on ultrasonic phase velocity and attenuation in Eccosorb and PMMA

Category
Journal publication
Abstract
Phase velocity and attenuation of compressional and shear waves in the two materials PMMA and Eccosorb MF-117 were measured as function of frequency and temperature, using a broadband through-transmission technique. Two pairs of transducers were used for the measurements, one pair with center frequency 5 MHz, covering the frequency range from 2.5 MHz to 6 MHz, and one pair with center frequency 10 MHz, covering the range from 5.5 MHz to 10.5 MHz. The measured results for PMMA showed a good agreement with published values, thus verifying the accuracy of our approach. From 2.5 MHz to 6 MHz, a negative dispersion of 2 m/s/MHz was observed for the compressional wave velocity in PMMA. The dispersion for Eccosorb MF-117 in the same frequency range was also negative, and measured to 5.5 m/s/MHz. The dispersion value did not change over the investigated temperature range, from 20°C to 37°C, although the phase velocities changed with temperature. The shear wave velocity showed a similar trend, with negative dispersion 2 m/s/MHz for PMMA and 4.5 m/s/MHz for Eccosorb MF-117. The attenuation of both compressional and shear waves in both materials increased with frequency over the investigated frequency ranges. Increasing the temperature from 20°C to 37°C caused a decrease of 3% and 5% in the phase velocity of PMMA and Eccosorb MF-117, respectively. Over the same temperature range, the attenuation increased by 35% in PMMA and by 30% in Eccosorb MF-117.
Client
  • Norges forskningsråd / 237887
Language
English
Author(s)
Affiliation
  • University of South-Eastern Norway
  • SINTEF Digital / Connectivity Technologies and Platforms
Year
2016
Published in
Proceedings - IEEE Ultrasonics Symposium
ISSN
1948-5719
Publisher
IEEE Geoscience and Remote Sensing Society
Volume
2016-November