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