gary wrote:This is just my opinion Harry but I think you should persevere with this arrangement if only for the "hell of it' - in principle it should be able to produce a reasonable picture and who cares if it isn't exactly to spec? I mean there are people on this forum who are (shhhhh) experimenting with entirely "electronic" systems - yes sacrilege I know, but if it makes them happy... and, more importantly, keeps them quiet...
Oh yes there is something about a mechanical way that perhaps makes it a little harder and combines them both ,i just wanted to try the rocking mirror idea to see if it would work i expected problems on that side of things.
The optics would of been easier if the polygon was a wider mirror but would be boring if all this was easy .
If you put 6.25 Hz into your "vibrating" mirror then you should end up with 12.5 frames per second if my imagination serves me right (and heaven knows I am no Einstein or Tesla when it comes to "thought experiments").
I have to send the results from tonights test in the next post as its on the lap top i recorded them on as wav files but results were it worked at 12 hz and not at 6 hz ! i don't understand...i did some recordings as your frequency testing would be better than mine .
I tell you what - if you continue your experiments with this I will write some software to reverse every second frame and display it correctly, hows that?
That would be good if still needed but tonights test may well interest you i am double checking with you what you think .
and yes you could up the line rate to 800 Hz and go 25 fps - why not? But can your motor/polygon do 8000 RPM???
May be if i do a direct drive the pulley system at the moment looks around 3 to 1 off hand have to really check that .
BTW, what do you mean by resonance? I assume you are talking about a galvanometer type of set up?
I think it is just the oscillating magnetic field rocking the thin flat metal rod at the best point more than likely be a different position with out the large mirror but it works what ever you call it .
[/quote]I am not sure what they do in the 625 line oscillating mirror systems (I have never really been convinced they are real) but, in a CRT television system they actually require a finite fly-back period (can you image such inadequacy? tch tch) and I suppose it is possible for a very well designed galvanometer to replicate that, I am not sure.
I have seen 2 and had me wondering ! any case all that is why beyond what i could do .
I will upload the results of tonights test next post .