lecture10b ultrasonic transducers printable[1]

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  • 8/13/2019 Lecture10b Ultrasonic Transducers Printable[1]

    1/8

    ,

    .

    /

    ,

    ()

    :

    ()

    ,

    ,

  • 8/13/2019 Lecture10b Ultrasonic Transducers Printable[1]

    2/8

    , (, )3,

    (3)

    (26)

    (3)

    ()

    , ()

  • 8/13/2019 Lecture10b Ultrasonic Transducers Printable[1]

    3/8

    , ()

    ( , )

    ( )

    cf

    = 0

    2

    cf

    t=0 2t =

    () ( )

  • 8/13/2019 Lecture10b Ultrasonic Transducers Printable[1]

    4/8

    ()

    ( )

    :

    0

    bandwidth

    fQ =

    ()

    matching element tssueZ Z Z=

    1

    4matching

    t

    =

  • 8/13/2019 Lecture10b Ultrasonic Transducers Printable[1]

    5/8

    80 %

    20

    ( ) ( )

    64 128

  • 8/13/2019 Lecture10b Ultrasonic Transducers Printable[1]

    6/8

    ( )

  • 8/13/2019 Lecture10b Ultrasonic Transducers Printable[1]

    7/8

    2 2

    Near field length4

    d r

    = =

    sin 1.22d

    =

    ,

    ()

    3 :

  • 8/13/2019 Lecture10b Ultrasonic Transducers Printable[1]

    8/8

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