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Re: Re:High speed Tesla spark photographs - new mirror



Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi,

Nice Peter! Just mounting a single mirror close to the spinning axis is a nice way to go. My block mirror does get along "aerodynamically" better though since it is less of a flying wing. Back surface mirrors should not be too bad since we always take the pictures at a significant angle where direct reflections are not a problem. Common mirror distortions and some lens effects will be there, but I don't think we would really notice for this work. A common cheap plate glass mirror might do perfect fine!

"I" have not made any progress these last days due to other stuff going on...

Cheers,

        Terry


At 10:38 AM 10/1/2006, you wrote:
I have been a bit busy with other pursuits such as picking up some big old discarded physics equipment and attending the Tesla exhibition. A week without new developments has been a long time in the high speed Tesla photography field. I was however able to obtain a new higher quality mirror of 10 x 15 cm which although rear silvered, does not show any distortion visibly when viewed from a distance. It is well centered but moves a fearsome amount of air and has some vibration at 3000 RPM (250 VAC) but 2000 RPM (85 VAC)seems comfortable. It is a big mirror to spin fast but the aluminium supports seem to hold it firmly without adding too much weight or obstructing the view. The reduced revs should be countered by the much clearer and wider view. Still needs to be tested in use though.
http://tesladownunder.com/HighVoltage.htm#High%20speed%20Tesla%20spark%20photography
I have also done some testing on a 7 stage LED meter to get the feel for how it will work. Now have to make a reverse copy to indicate the opposite polarity then run things with the new mirror.

Peter


Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
Hi Peter,
.......
The mirror was spinning at 7500 RPM in those photos but "cheap cam" made it look "still"... I have been pushing higher RPMs now to separate the lead up leaders... If anything gives way, I get to go buy a "new" camera ;-))
......
Cheers,

        Terry