2003-(II)-Ultrasonic techniques - The Resonator

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Ultrasonic instruments: 

The ultrasonic cell consists of two piezoelectric transducers arranged parallel to each other. One of these disc-shaped transducers acts as the transmitter, the other one as receiver. The surfaces of  the  used  transducers  are  coaxially  plated  with  electrodes  (chrom/gold). The soundwave is induced by the inverse piezoelectric effect.

In principle two kinds of ultrasonics techniques  were  used  in  present  project;  the  resonator  method  and  the pulse transmission method. The principle of the resonator method is based on folding the acoustic path via multiple reflections in order to obtain a resolvable amplitude decay at lower frequencies. With the help of pulse methods it is possible to make measurements of the exponential amplitude decay versus distance of propagating waves, which propagate through the liquid. Standing and the traveling wave methods overlap in a wide range and can be used to check the consistency of measured ultrasonic spectra. 

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