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Additional resources for Techniques and Mechanisms in Electrochemistry
As we will see below most ultrasonic sources do not produce the single frequency specified by the manufacturer. This will effect the accuracy of the method since harmonics of the ultrasonic frequency used will have different absorption coefficients. 10 Methods Based on Particle Velocity Direct measurement of the velocity or the amplitude of displacement of an imaginary particle submitted to an ultrasonic field is not easy. Filipczynski  suggested the use of a capacitance probe method in which the vibrations in the medium are picked up by a diaphragm.
J. MASON was determined at various frequencies. 81 mm diameter spherical bead of varnish it was observed that this ratio dramatically decreases when the thermistor radius equalled half of the wavelength. The preceding studies were mainly carried out under free field conditions at high frequencies. 5 kHz) under restricted field conditions. Their experimental device, similar to that used by Timmerhaus and Fogler , is illustrated in Figure 13. The emitter is a magnetostrictive transducer with base area 16 cm 2 attached by epoxy to the bottom of a 600 cm 3 beaker filled with water as coupling fluid.
This is almost never exactly true, but this assumption can lead to a reasonable estimate of the dissipated ultrasonic power. High pressures generated by the oscillations of the bubbles and (or) their collapse cannot be directly measured, but an indication can be obtained by using very small microphones as probes [59-61]. Although these acoustical probes can be made very small they will always slightly disturb the ultrasonic field. Just as in the case of coated thermal probes, the response signal depends on the nature and size of the probe, thus it is important that the microphones are carefully calibrated.
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