Ultrasonic absorption measurements by means of a megahertz - range measuring set

Abstract
The aim of this work is a detailed description of measuring sets that were designed and constructed in our laboratory. These apparatus are based on the standard pulse technique where the amplitude of the first transmitted pulse is measured as a function of distance. The advantage of the method applied is achieving of a relative wide frequency range together with relatively high accuracy and precision of measurements. Moreover, this method enables absolute measurements of the attenuation coefficient. However, the quality of all measurements depends strictly on some elements that are not commercially available, such as the measuring cell with transmitting and receiving transducers, and the electronic parts of the measuring set. In order to illustrate the quality of our measuring sets, a few results for pure liquids as well as for some mixtures are presented.