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Physics Quiz 3.2

TermDefinition
Aperture transducer size, foot print size
curved element as the element is curved more, the focus moves closer to the transducer and becomes tighter
side lobes some intensities are not contained within the sound sound beam and they escape out of the sides and cause artifacts
diffraction from a small point source (transducer), sound goes out in all directions
Huygens principle each small portion of the surface of a transducer may be considered as a separate source
beam diameter -as the sound travels through the near zone, the diameter decreases, as the sound travels through the far zone the diameter increases -depends on: wavelength(frequency), element diameter and distance from element
far zone region that lies beyond a distance of one near zone length, beam diverges
near zone region that extends from the element out to a distance of one near zone length, beam converges
near zone length depends on size and frequency of the element increases with increasing frequency and diameter squared
focal zone the distance between equal beam widths (focus), the zone between the near zone and far zone, the beam is the narrowest, the best resolution occurs in this zone
focal length distance from the transducer to the center of the focal region (short, medium, long)
beam formation combining the sound coming from all point sources
sound beams with a disc element the beam widths within the scan plane and perpendicular to it are equal to the beam diameter
focusing curved transducer element (internal focusing) curved reflector lens phased array can only be accomplished in the near zone
Created by: Sierd98765
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