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producing ultrasound

Discussion in 'Electronic Basics' started by [email protected], Feb 11, 2006.

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  1. Guest

    Is there any way of producing ultrasound without applying a current
    through a crystal (such as a mechanical method). For example, if you
    move an old door it can creak due to the vibrations produced, but could
    a mechanical movement such as this produce an ultrasound?
     
  2. Phil Allison

    Phil Allison Guest

    <

    ** A supersonoic dog whistle creates an inaudible ultrasound tone.

    Did you want the sound to be inaudible?




    .......... Phil
     
  3. Don't you know what ultrasonic means?
     
  4. Yes. So will clapping your hands.
     
  5. Phil Allison

    Phil Allison Guest

    "Anthony Fremont"



    ** Go root a dead donkey - you PITA autistic, moron.





    ........ Phil
     
  6. Speaking of autistic behavior, why don't you just answer the question
    asked instead of the giving an answer to an unasked question?
     
  7. Guest

    why dont you both stop the childish arguments, as they are largely
    uneducational and unresolving and just add to the mass of online
    bullshit.
     
  8. And exactly what are you doing now? I gave you the answer to your
    question and now you take a slap at me? You might also wish to learn
    how to make a post that contains some context.
     
  9. steamer

    steamer Guest

    --Hmm. I guess you could look around for an old ultrasonic cleaner.
    I'm remembering rule #1 with these units: don't run them empty. I'm thinking
    whatever you wind up with, you should make sure it's only in use when
    there's a load on it, else it blow up or something..
     
  10. Rich Grise

    Rich Grise Guest

    Sure - a little tuning fork with a resonant freq. of 40 KHz. The earliest
    TV remotes did this - there was a little hammer that whacked the tuning
    fork. The TV, of course, had a regular receiving transducer.

    Or, look at some music boxes and figure out how long of a prong it would
    take to vibrate at the target frequency.

    Or, take something like a cricket wing, and stroke it very, very fast.

    Good Luck!
    Rich
     
  11. Phil Allison

    Phil Allison Guest

    "Anthony Fremont"



    ** Go root a dead donkey - you PITA autistic, moron.





    ........ Phil
     
  12. Bob Masta

    Bob Masta Guest

    Absolutely! In fact, ultrasonic "sniffers" are one way of
    detecting leaks in high-pressure steam systems.
    In the natural world, most cricket-type insect sounds
    are made by scraping two structures together, and
    these sounds have very high ultrasonic content.

    I suspect if you build a detector you will find all
    kinds of ultrasound around the home, and
    definitely around any mechanical shop.

    Best regards,


    Bob Masta
    dqatechATdaqartaDOTcom

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Home of DaqGen, the FREEWARE signal generator
     
  13. Stef Mientki

    Stef Mientki Guest

    An electronic ignition, based on piezo xtals,
    will produce a point source very sharp US pulse
    (very good for accurate distance measurements),
    but I guess, whil the source is mechanical,
    there is still a current ;-)

    Stef
     
  14. Don Foreman

    Don Foreman Guest

    Galton and Hartmann whistles can produce very intense ultrasound from
    compressed air. These are easy to make if you have a lathe.

    Sirens

    Impact a metal bar, like a chime, that is resonant at an ultrasonic
    frequency. Ultrasonic chimes are usually solid bars. Some early
    TV remotes (Raytheon) worked this way. No batteries!

    Google on ultrasonic whistle. You'll find other possibilities.
     
  15. Charles Jean

    Charles Jean Guest

    And if you don't have a lathe handy, you can go to a pet shop and buy
    an ultrasonic dog whistle for under $10. Hook up a can of compressed
    air(as used for dusting off electronic stuff) and you'll have an
    on-off switch. Most of these dog whistles can also be tuned slightly.

    Cheers!
    Charlie
     
  16. Sure, many animals (bats, rodents, insects) produce ultrasound for
    communication and echolot. Gas leaks can be located by the ultrasound
    they produce, much safer than with a lighted match. Wind noise contains
    ultrasound. And many high frequency speakers can also be used for the
    production of ultrasound, at least in the 20-30 kHz range.
     
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