Abstract
The correlation between the input and output signals of an ultrasonic ransmitter–receiver system with two quartz transducers was used for the simultaneous measurement of sound speed and sound absorption in liquids. With a correlator built from a semiconductor heterodyne detector (active mixer) followed by a low-pass filter, the space-dependent cross-correlation function of the signals, which depicts the sound field in the liquid, was recorded on a x-t recorder by continuous variation of the transmitter–receiver distance. First tests with the apparatus yielded a reproducibility of the sound velocity of ±0.1%, that of the sound attenuation was within ±3%.
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