Аннотация
Pulses of shear-mode ultrasound (center frequency 10 MHz) are reflected from the surface of a series of vegetable and synthetichigh-viscosity calibration oils at a range of temperatures (5–50C). For all samples and temperatures there is a single negativecorrelation between the magnitude of the echo from the interface between the delay-line and the sample and the viscosity ofthe sample. Similar experiments with longitudinal ultrasonic waves show the amount of sound reflected decreased with increasingviscosity, but there is no single correlation for all samples.
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