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Thread: Sonar Quiz #17

  1. 09-24-2014, 03:33 PM #1
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    Default Sonar Quiz #17


    Piezo elements are designed to purposely incorporate 3 major criteria of the piezo element's characteristics....

    1. What criteria determines the "shape" of a piezo element's sonar beam ...??

    2. What criteria determines the "size" (beam angle) of a piezo element's sonar beam ...??

    3. What criteria determines the "Resonate Frequency(s)" of a piezo element's sonar beam ...??

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  2. 09-24-2014, 06:17 PM #2
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    Rickie, you've moved on to the advanced course, while most of us haven't completed the basic class yet.
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  3. 09-25-2014, 07:36 AM #3
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    Google is amazing ...

    Rickie
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  4. 09-25-2014, 11:05 AM #4
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    I could answer those questions but I just don't want to right now.
    Get the net!
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  5. 09-25-2014, 04:10 PM #5
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    The dog ate my homework.
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  6. 09-29-2014, 04:46 PM #6
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    I know but I don't want to make you guys look dumb. BHAWAWAWA



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  7. 09-30-2014, 07:46 PM #7
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    a thicker element has a lower resonance frequency than a thinner element of the same shape.
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  8. 10-01-2014, 03:02 PM #8
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    1. The shape of the transducer crystal determines the shape of the beam.

    2. The size of the transducer crystal determines the beam angle. A very small transducer transmits in almost all directions. As it gets larger, the beam becomes more focused, so a narrow cone angle transducer is larger than a wide angle transducer.

    3. The crystal vibrates best when the thickness of the crystal is equal to half of the wavelength of the signal driving it. So like Kosmo said, since a lower frequency has a longer wavelength, a thicker element has a lower resonant frequency.
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  9. 10-01-2014, 05:37 PM #9
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    Quote Originally Posted by CatFan View Post
    1. The shape of the transducer crystal determines the shape of the beam.

    2. The size of the transducer crystal determines the beam angle. A very small transducer transmits in almost all directions. As it gets larger, the beam becomes more focused, so a narrow cone angle transducer is larger than a wide angle transducer.

    3. The crystal vibrates best when the thickness of the crystal is equal to half of the wavelength of the signal driving it. So like Kosmo said, since a lower frequency has a longer wavelength, a thicker element has a lower resonant frequency.
    I knew someone would come thru here...

    Thanks John ...



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