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Số người truy cập: 34,732,032

 Temperature Effects on Ultrasonic Phase Velocity
and Attenuation in Eccosorb and PMMA
Tác giả hoặc Nhóm tác giả: Hoa T. K. Tran, Tung Manh, Tonni Franke Johansen, Lars Hoff
Nơi đăng: 2016 IEEE International Ultrasonics Symposium (IUS); Số: 20161103;Từ->đến trang: 1-4;Năm: 2016
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT

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
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