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Sorry, I missed that link. Just looked at it now. Many thanks, that article will be a great help. Much appreciated.

Yes, they would essentially be 1D standing waves. The root of the problem I have is that I can create standing waves with a cheap low power ultrasonic transducer at about 40kHz in air without a tube (eventually this will be placed in a tube). In this case, the wire mesh grill was removed from...

The standing wave distance to the reflecting surface should be from the rigid radiating surface of the tweeter and not to the grille surface. Yes, I understand. I only mentioned the grill to point out that maybe it had an effect on waves bouncing back from the reflecting surface into the...

I should probably clarify.... Also, I have already managed to get a standing wave from a small low power ultrasonic transducer (about 40kHz) in air. In saying that I was only a few wavelengths away from the transducer. Should have said, the reflecting surface was only a few wavelengths away...

I expected to have to do this in a tube at some stage but did not expect to have to put into such a small diameter tube. Could you explain why the diameter needs to be so much smaller please (even a web link to something on the topic would be brilliant). Also, I have already managed to get a...

Apologies, you are of course right, the wavelength is 1.6cm I will try a slightly different approach and see if I can get some more results for tomorrow.

Are your pressure fluctuations on the same scale as your mean pressure? >>I'm not exactly sure what you maen by that (I'm not an acoustic engineer). At the moment, I'm doing this in open air. Not in a tube etc. This might make things a little difficult for me (i.e. making sure that the...

At the moment high is only using a 3W amplifier but I hope to bring that closer to 100W once I get it working. When you say non-linear, what do you mean?

In air at room temp at 21kHz with an expected wavelength of about 16cm. It sounds too simple not to work!

Hi there, I expected this to be very simple but I cant seem to get it working properly. Basically I would like to create a high power standing ultrasonic wave (I am using a 3W amplifier). I have tried using a tweeter but with no joy. At the moment, I'm working at 21kHz and am confident that...