Gregory wrote:Thanks for the info, and from what I understand as with the televisor the camera can use the Nipkow disk or mirrors , assuming it will be used under normal light conditions, an not in the dark with a flying spot.
Theres no reason why you couldn't do a small 2 mirror drum version of your monitor for a camera if you want to go small and multi system,but would have to be in a light proof box again apart from the lens system or just lens focusing the image to it .
With the nipkow disk I believe from 32 to 64 lines, the light level will be a quarter, as the spot area will be this.
The mirror system seems more appealing, and I like the idea of the vibrating mirror for the frame scan, and at 12.5 hz it should be possible to follow a sawtooth path, with suitable mechanics.
The vibrating mirror has on flaw ..line fly back is not instant as with a rotating mirror drum so has to run twice the speed so best to make the framing mirror this idea .
Cameras are hard but you never know with these things till you try and work out the problems ,one thing i was not expecting on the nipkow side is does not matter so much how good your nipkow holes are lined up it the will be no gaps in the resulting video ,only mechanical sync is more of a problem any vibration makes the sync pulse width sightly different so the lines will line up wavy , mounting the disk mirror on some thing like a vcr head or HD drive motor where there will be none of that is the way to go !
Light levels for the nipkow will be small anyway 32 or 64 line amplification and your pick up device should be sensitive enough and just use more light all that has to be experimented with ,i used a PMT which can detect a photon ,i have only really used solar cells on flying spot pickup camera but as i recall Troy did it .
Panrock i forgot has a 3 colour PMT camera on the forum as well.
The point that worries me is how large the mirror drum will need to be. The normal view angle of a camera is around 60 degrees, so if I am not wrong this would need a 12 sided mirror. I am not sure how large the image on this needs to be to work correctly with sufficient sensitivity.
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Comes down to optics ! my nipkow PMT camera i used a old video camea lens to focus the scene on nipkow scanning raster size which i made from a cd dvd the resulting image was tiny to the nipkow but all the area was there on the scanning raster ..its your lens system construct your camera for the lens system ..small is not that much of a problem .