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The recording of sound waves in a two-dimensional pattern (the hologram) and the use of the hologram to reconstruct the entire sound field throughout...


= Encyclopedia Article; = Research Update
Figure 1.Underwater hologram measurement system for the study of vibration, radiation, and scattering from air-filled steel shells. Diagram shows vibrating source and array of points marking measurement locations in the hologram. Hydrophone and axial scanner are not shown.
From Encyclopedia article 'Acoustical holography'
Figure 2.Reconstruction, by means of nearfield acoustical holography, of the pressure field at four instants in time during the scattering of a wave pulse (traveling from right to left). Red represents positive pressure, green represents negative pressure, and blue represents ambient pressure. (a) 50 µs. (b) 350 µs. (c) 650 µs. (d) 950 µs.
From Encyclopedia article 'Acoustical holography'
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