Maker Pro
Maker Pro

producing ultrasound

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?
 
P

Phil Allison

Jan 1, 1970
0
<[email protected]
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?


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

Did you want the sound to be inaudible?




.......... Phil
 
A

Anthony Fremont

Jan 1, 1970
0
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?

Yes. So will clapping your hands.
 
P

Phil Allison

Jan 1, 1970
0
"Anthony Fremont"



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





........ Phil
 
A

Anthony Fremont

Jan 1, 1970
0
Phil Allison said:
** Go root a dead donkey - you PITA autistic, moron.

Speaking of autistic behavior, why don't you just answer the question
asked instead of the giving an answer to an unasked question?
 
why dont you both stop the childish arguments, as they are largely
uneducational and unresolving and just add to the mass of online
bullshit.
 
A

Anthony Fremont

Jan 1, 1970
0
why dont you both stop the childish arguments, as they are largely
uneducational and unresolving and just add to the mass of online
bullshit.

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.
 
S

steamer

Jan 1, 1970
0
--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..
 
R

Rich Grise

Jan 1, 1970
0
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?

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
 
P

Phil Allison

Jan 1, 1970
0
"Anthony Fremont"



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





........ Phil
 
B

Bob Masta

Jan 1, 1970
0
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?

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
 
S

Stef Mientki

Jan 1, 1970
0
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?
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
 
D

Don Foreman

Jan 1, 1970
0
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?

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.
 
C

Charles Jean

Jan 1, 1970
0
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
 
D

Dr Engelbert Buxbaum

Jan 1, 1970
0
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?

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.
 
Top