20th December 2005 - 08:29 PM
I am trying to vibrate a tissue with a sound source that is directed at the tissue, but not in direct contact with the tissue. I have been told that using acoustic waves will provide this type of push/pull motion. That is, they will push the tissue and actually pull it back to equilibrium, as opposed to just allowing the tissue to come back to it's equilibrium position on it's own before the next wave hits. I have also heard that ultrasound waves do not have this property. That is, they result in static displacement and will not allow the tissue to return to equilibrium unless the source is off (as is the case in pulsing ultrasound). A co-worker told me this was not true about acoustic waves. Example the front of a speaker only vibrates in and out because the membrane comes to rest on it's own before the next vibration. Can you tell me the properties of these waves (in air as well as in water) in this kind of situation and maybe a source of information?
30th January 2006 - 09:23 PM
Im not too well up on acoustic waves but ultrasound waves are made using piezoelectric crystals.
Basically ultrasound is where the wave hits the object and depending on its make-up and density, makes the wave "bounce" back at a certain time.
This would NOT cause tissue to move at all i wouldnt have thought
Interesting project you got going though, keep at it.
10th January 2012 - 02:11 AM