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Underwater ultrasonic transducers

Discussion in 'Electronic Components' started by kellyruperts, Feb 14, 2005.

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  1. kellyruperts

    kellyruperts Guest

    Hello all,
    I'm considering doing a senior project to measure water velocity
    using ultrasonics and doppler measurement, and wondering if anyone
    knows a good, low cost transducer (I'll actuall need two, one to
    trasmit and one to receive). It seems the best ones to use are between
    1 - 2.4 MHz. Also, do I need an oscillator to drive the transducer, or
    can I just apply a continuous voltage? Any other help anyone can
    provide would be useful (especially relating to how to construct an
    underwater housing for the transducers).

    Best
    Kelly
     
  2. Pi

    Pi Guest

    I know a n address in Poland, but you may better check in the USA (I
    assume that is where you live).
    You can use a sine, but also pulses that make the transducer swing at
    its resonant frequency. All depends on the manufacterer.
    There are transducers for use in water.

    I did a pre-diesing of a transducer system to measure wall-thickness
    of steel pipes from inside the pipes. Feel free to ask any questions.

    Regards,
    Pieter Hoeben
    http://www.hoeben-electronics.com
     
  3. Would a marine depth sounder transducer work?
     
  4. kellyruperts

    kellyruperts Guest

    Hi Pieter,
    Thanks for the information, I will try to give you a little more
    background. My original plan was to use to transducers, 1 to transmit
    and 1 to receive, but I could also just use one and do a pulse then
    measure the frequency of the response, although this is a lot more
    complicated for timing issues. The only transducer in the appropriate
    frequency range that I have found is from Panametrics NDT:

    http://www.panametrics-ndt.com/ndt/ndt_transducers/immersion/std_case_style.html

    The problem is that they are a little too long and are very expensive
    (each one costs $270). Does your contact in Poland have anything that
    might be better? If I could keep the length of the transducer at less
    than 1 inch it would make it easier to mount at the bottom of the
    fluid. I talked to the sales staff and they said the housing is filled
    with an epoxy so the wave transmits to water, but I don't know if it is
    possible to do this in less space.

    Any other suggestions from your experience would be helpful. I plan to
    take the transducer output to an amplifier IC (to be determined)
    through an ADC to my microcontroller.

    Best
    Kelly
     
  5. mike

    mike Guest

    What's the objective?
    Ultrasonics?
    Sound velocity measurement?
    Doppler?


    Seems like there ought to be ways to use any old piezo transducer
    you can find on any motherboard. Might be able to break off pieces to
    resonate anywhere you want.

    Maybe you can fire off a flash tube under water and measure the shock wave.
    I'd give you more ideas, but it's not MY senior project;-)
    mike

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  6. kellyruperts

    kellyruperts Guest

    Hi William,
    The objective is water velocity measurement using doppler. Breaking
    existing piezo transducers might not be accurate enough, I estimate at
    least 500 MHz would be necessary and I don't think any amount of
    breaking would get it into this range.
     
  7. mike

    mike Guest

    Ok, my bad. I extrapolated to infer measure the velocity of the
    ultrasonic wave in water.

    I think that trying to make an acoustic wave at 500 MHz. will be
    very difficult. What's the thinking behind needing a frequency that high?
    What range of velocity are you trying to measure?
    What accuracy do you need?
    What are you going to do about turbulence?
    mike


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    Return address is VALID but some sites block emails
    with links. Delete this sig when replying.
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    Wanted, PCMCIA SCSI Card for HP m820 CDRW.
    FS 500MHz Tek DSOscilloscope TDS540 Make Offer
    Wanted, 12.1" LCD for Gateway Solo 5300. Samsung LT121SU-121
    Bunch of stuff For Sale and Wanted at the link below.
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