AGITATOR OF A LIQUID SAMPLE

摘要

An agitator by vibrations includes an annular resonator to which is applied a vibratory stress by piezoelectric transducers. A preferred stress shape is a bending of the ring perpendicularly to its plane to excite inherent modes at relatively low frequencies. Use of a solid annular transmitter enables the vibrations to be satisfactorily controlled to maintain satisfactory transmission to the sample to be agitated, and to focus them on it. Excitation frequencies are frequencies inherent to the ring or to the tank.