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12 Cards in this Set

  • Front
  • Back
Near Zone name?
Fresnel
Far Zone name?
Fraunhofer
At the end of the near zone, the beam diameter is _____ the transducer diameter.
1/2
At two near zone lengths, the beam diameter is _________ the transducer diameter.
equal to
What are the two factors that determine focal depth?
Transducer diameter and frequency of the US
Compared to beams with a shallow focus, beams with a deep focus have a __________intensity at the focue
lower
Definition of Sound Beam Divergence
The spread of the sound beam in the deep far zone
Sound beam divergence is determined by two factors. Name them.
transducer diameter and frequency of the US
larger diameter = ____________ divergence
less
smaller diameter = ___________ divergence
more
Higher frequency = __________ divergence
less
Lower frequency = _______ divergence
more