lecture10b ultrasonic transducers printable[1]
TRANSCRIPT
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8/13/2019 Lecture10b Ultrasonic Transducers Printable[1]
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,
.
/
,
()
:
()
,
,
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8/13/2019 Lecture10b Ultrasonic Transducers Printable[1]
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, (, )3,
(3)
(26)
(3)
()
, ()
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8/13/2019 Lecture10b Ultrasonic Transducers Printable[1]
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, ()
( , )
( )
cf
= 0
2
cf
t=0 2t =
() ( )
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8/13/2019 Lecture10b Ultrasonic Transducers Printable[1]
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()
( )
:
0
bandwidth
fQ =
()
matching element tssueZ Z Z=
1
4matching
t
=
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8/13/2019 Lecture10b Ultrasonic Transducers Printable[1]
5/8
80 %
20
( ) ( )
64 128
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8/13/2019 Lecture10b Ultrasonic Transducers Printable[1]
6/8
( )
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8/13/2019 Lecture10b Ultrasonic Transducers Printable[1]
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2 2
Near field length4
d r
= =
sin 1.22d
=
,
()
3 :
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8/13/2019 Lecture10b Ultrasonic Transducers Printable[1]
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(, , )
( )
,
,
,
!