gary wrote:Yes, that's what I had had in mind Harry.
Yes sorry Gary reading bits on the jeffree cell it is complex in what it can do just looking into it out of interest if it can go any where or any thing i can try .
Building a Jeffree Cell is something I have always wanted to have a crack at but had never found a source for the quartz crystal.
One or 2 on the forum also have looked into it in the past... i know Chris long is interested i may have a chat with him on it when he comes back from NZ.
Trying to cut one if you can get the Quartz looking at that video i think i would have no hope ,i suppose stuck with experimenting on what we have handy these days ..i am pleased your interested do experiment if you can if you can get hold of something ..may be you could do it with the cnc ! if you could get a crystal least you know how its done to get a ruff cut to work ..
Something i have read twice in the stuff i have posted up is (the light stop) used in a version of it , which i think it means the lens that focuses the light to the cell hits a black spot on the cell far side a circle of ink indian ink its mentioned in one , so no light passed the cell until there's an ultrasonic signal and the light now due to diffraction passes the light stop ...?
I am also seeing another type where as this is not used in this case of a tube with the line of the scan showiing up as light dark bands in the cell pretty and used as the line scan and just focused to the frame scanning mirror i think ..i was not expecting the different ideas on the same idea
I would think a polarized lens glass would do the same thing for the light stop idea...again i think but have not read of it used on a jeffree cell
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Although you have an older, and therefore larger, version there I am not sure if it would be large enough (although I have always thought that a miniature version would be possible), at least to produce something like that detailed on the bluehaze site.
I agree looking at what just a normal transducer does in my past experiment i don't think even it would have the energy to move that liquid enough if it could do a few MHZ....
But may be as you mentioned if its done smaller perhaps a smaller crystal would be in range to do the same thing ..with the size mentioned on chris longs site and looking at the size posted up in the articles on the liquid NBTV transmitting topic i think you do need a bigger crystal unless these things can be vibrated at a high intensity than trying to do it with 5 volts in a solid state circuit ..may i need to look how they did it with the valve circuit voltages and such .
Also since it could be tried for NBTV the crystal could be 5 times less wasn't is 2 mhz band width needed ? and the used a 10 hz crystal used so something around 100khz for nbtv ? so vibrating a crystal with the same circuit would give a more intense vibration at this lower frequency ...i am thinking a bit like the effect you see needed when using higher or lower line rates trying to deflect a crt beam in for line scan deflection its harder to get the deflection line size across the CRT face higher you go in line rate frequency .
Chris long thought a older crystal could do the job i see there are different versions off older crystals i think we would have better luck with that WW2 type i don't think they got any bigger than than or a touch looking at these ....i would of used these if i had them...theres a site that sell the older type interesting in the link below via a link on its page the old army type might be worth trying .
http://www.af4k.com/crystal_holders.htmI will be watching your progress with great interest.
I would if it gos any where use a laser instead of the lens focusing idea ...not being able so far to contact the liquid with out the crystal stopping is a problem ..i have to do the experiment again on the other side of the crystal where the side i used was the side where the frequency of the crystal comes out may be that's a no no ........to test the other side i have to wire it out of the socket again cant to it up side down ...
It would effect the crystals frequency but some sort of water proofing on the Crystal side of the liquid would contact...could be a crystal killer so last resort .
Also seeing perhaps a tight membrane between the liquid and the crystal the crystal would work and perhaps transfer the oscillations via the membrane ...thinking out aloud here so who knows which way it go's
PS. Thanks for that link on quartz crystal making - very interesting indeed.
I would not like their jobs some very dangerous ! i found it very interesting too...
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.