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Modified treatment of ultrasonic pulse-echo immersion technique

✍ Scribed by M.H. Youssef; N.K. Gobran

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
96 KB
Volume
39
Category
Article
ISSN
0041-624X

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✦ Synopsis

A modified treatment of ultrasonic pulse-echo immersion technique is formulated to permit experimental determination of the amplitude reflection coefficient and the ultrasonic attenuation coefficient a especially when the acoustic impedance of the measured specimen is far from that of the immersion liquid. The modified treatment is tested experimentally on blends of styrene-butadiene rubber (SBR 1502) and natural rubber (SMR 20) containing different concentrations of high abrasion furnace black. The effect of changing the immersion liquid on the obtained values of a is studied by using distilled water and ethyl alcohol as immersion liquids. The effect of changing the specimen thickness is also investigated. It is found that neither the immersion liquid nor the specimen thickness has any effect of the obtained values of a if the present modification is adopted.

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