ultrasonic wave


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ultrasonic wave

A sound wave of greater frequency than 20 kHz. These waves do not produce sound audible to the human ear.
See also: wave
References in periodicals archive ?
The time of flight of ultrasonic waves along different paths in the sample was calculated.
When subjected to such large deformations, the specimen experiences a significant plastic deformation and necking in its central cross section, and so nonlinear ultrasonic wave response at each position is various for one loading condition.
It was found out that the amplitude of the ultrasonic wave decreases in tension face and increases in compression face [22].
When the position and amplitude of ultrasonic signals are changed, the following gate should be used to track the region of interest; then, the character of defects can be evaluated if each discrete point has assigned an ultrasonic wave received by the A/D acquisition card.
In the experiments, we mainly studied the relationship between the mechanical structures of the coal samples and the ultrasonic wave parameters.
Ultrasonic wave not only can degrade pollutants through oxidation and pyrolysis processes in soil, but also move the pollutant to the other sources such as water through soil washing which is much easier to decontaminate it [12- 15].The effect of ultrasonic power (0, 200W, 500W, 1000W) on the degradation of hydrocarbon in contaminated soil with 0.4g/Lof nZVI particles, 40degC and 30mM H2O2 is shown in Figure5.
To evaluate the ultrasonic nonlinear characteristics, a single-frequency ultrasonic wave is launched into the specimen, and the signal of the ultrasonic wave transmitted through the material is received.
Where, f is the frequency of the ultrasonic wave propagated.
In this respect, the vector displacement [??] is the sum of the vector displacements of a longitudinal [u.sub.l] and of a transverse ultrasonic wave [u.sub.t]:
In recent years, the use of ultrasonic waves to remedy the contaminated soils has received considerable attention.
It works using an intermittent electromagnetic signal and ultrasonic wave noise to drive pests away.
The temperature increase of the oscillation part of the ultrasonic wave ([DELTA]T) is shown as Eq.

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