Acoustic Imaging: Cameras, Microscopes, Phased Arrays, and by Byron B. Brenden (auth.), Glen Wade (eds.)

By Byron B. Brenden (auth.), Glen Wade (eds.)

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Additional resources for Acoustic Imaging: Cameras, Microscopes, Phased Arrays, and Holographic Systems

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Eq. 49» II = 21 c (1. 80) is exerted on the surface. If the beam is several hundred wavelengths in diameter and if the liquid surface extends well beyond this diameter, the effect of this pressure is to raise the surface a disance h. The radiation pressure is opposed chiefly by gravitational forces for which the corresponding pressure is II g = pgh (1. 81) g being the acceleration of gravity. 82) It is instructive to compare the magnitude of surface displacement as given by Eq. 82) with the amplitude of particle displacement, wo ' which, in accordance with Eq.

The more practical system, with the readout 3cheme previously described, was first proposed by Adler, Korpel, and Desmares in 1968 [16]. Much effective work has gone into the development of this system, and it will be the subject of further detailed description and analysis in Chapter 10. V. BRAGG-DIFFRACTION SYSTEMS A third acoustic imaging system using laser-beam readout makes use of the principle of Bragg-diffraction of coherent light from ultrasonic wave fronts in water. Although somewhat similar to the Sokolov system illustrated in Fig.

If the beam is several hundred wavelengths in diameter and if the liquid surface extends well beyond this diameter, the effect of this pressure is to raise the surface a disance h. The radiation pressure is opposed chiefly by gravitational forces for which the corresponding pressure is II g = pgh (1. 81) g being the acceleration of gravity. 82) It is instructive to compare the magnitude of surface displacement as given by Eq. 82) with the amplitude of particle displacement, wo ' which, in accordance with Eq.

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