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Ultrasonic Transducer signals will travel through 4mm thickness ??

fuller levi
Prodigy 140 points
Other Parts Discussed in Thread: TDC1000

Dear 

       Vishy

1. What should be transducer thickness (will 2.2mm do?) for measuring oil level inside a 4mm wall thickness steel container?
2. For acoustic insulation of recommended 2mm all around transducer, which is better hot glue or silicon?
3. What should be the correct frequency for measuring oil level when wall thickness is 4mm? will 1Mz do? Should it be more? If so what frequency?
4. Will TDC 1000 support transducer frequencies higher than 1Mz, say 3 or 4Mz?
Thanks
  • 0
    Prodigy 200 points

    Just answered what I could:

    1) Transducer thickness, in the case of 2.1mm is related to the 1MHz frequency.

    2) I haven't tried silicon but hot glue has worked fine for me. Not 100% it's actually needed but hasn't hurt my application.

    4) The TDC1000 can be used with a wide-range of transducer frequencies (31.25kHz to 4MHz) and Q-factors.

  • 0 in reply to John Sampson
    TI__Mastermind 21685 points
    1. Yes, transducer thickness is related to resonant frequency.
    2. Note the glue that is applied around the transducer circumference and backside, is for acoustic dampening (due to its flexibility) and wire strain relief. You have to check if silicon is a good acoustic dampener or not. We mostly have used the glue referred in the SNAA266 appnote.
    3. 1MHz would do. Please check
    www.ti.com/.../snaa266
    4. Agree with John

    thanks,
    Vishy