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The science of sound waves having frequencies above the audible range, that is, above about 20,000 Hz. Original workers in this field adopted the...

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Figure 1.Sonicator, used to produce high-intensity ultrasound. (Misonix Inc.)

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Figure 10.Duplex display from a diagnostic ultrasound scanner. (a) B-mode image of the human carotid artery. The depth in centimeters is shown along the left side. The three white triangles mark the position of the electronic focal zones for transmit. The graphic in the center of the image indicates the location where the Doppler measurement is being made. (b) Spectral Doppler display. The abscissa (horizontal axis) is time in seconds, and the ordinate (vertical axis) is flow velocity from the angle-corrected Doppler measurement. The gray scale in the display is the relative power in the Doppler signal for the velocity and time specified by the location on the display.

From Encyclopedia article 'Ultrasonics'

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Figure 2.Graph of R/(?G8)1/2 and X/(?G8)1/2 versus the logarithm of 2pf?/G8 for a polymer consisting of chlorinated biphenyls (aroclor series), where R is the acoustic resistance, X is the acoustic reactance, ? is the density, G8 is the stiffness at infinite frequency, f is the frequency, and ? is the viscosity of the liquid. Curves give theoretical values, and data points give measured values.

From Encyclopedia article 'Ultrasonics'

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