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Mystery Photos from TDU

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Myke

Sun Jan 13 2008, 09:43AM

Registered Member #540 Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969

Your MOT in a MO surface tracking around a sheet of plastic. I don't know what type of plastic it is though.

Tesladownunder

Sun Jan 13 2008, 11:32AM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

Its an x-ray film - CT scan with an unused blank area. It is my MOT multiplier driving ignition coils via SIDACs capable of an easy 4 inch spark. The electrodes are 1 inch apart with the film in the middle and the spark extends out about 2 1/2 inches to go around the plastic.

The interesting thing was that the spark tracked back so accurately along the same path. Due to electric field effects I guess. They blur out closer to the electrodes as they are off the surface.

TDU

Mates

Sun Jan 13 2008, 12:23PM

Registered Member #1025 Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566

Tesladownunder wrote ...

Its an x-ray film - CT scan with an unused blank area. It is my MOT multiplier driving ignition coils via SIDACs capable of an easy 4 inch spark. The electrodes are 1 inch apart with the film in the middle and the spark extends out about 2 1/2 inches to go around the plastic.

The interesting thing was that the spark tracked back so accurately along the same path. Due to electric field effects I guess. They blur out closer to the electrodes as they are off the surface.

TDU

I think the sparks took the same track because the path was burned into it after the first spark occured. So it menas that the heat (and maybe the UV) made a tiny carbonized area which became to be better conductor than the rest of the sheet. You can check the tracks if put the sheet into the fridge for a while and than you breath on it...

Tesladownunder

Sun Jan 13 2008, 05:03PM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

You didn't understand what I meant. The spark travels on one side of the film then on the opposite side of the film, it very closely follows the path, so you have two nearly overlapping sparks seen through the film.
Subsequent sparks follow diffferent paths and are not burnt in to the film.
The developed vs non developed side doesn't seem to make much difference although the silver layer would be expected to be potentially more conductive.
You can see this on one with a single spark here.

TDU

1200243834 10 FT10696 Hvsparkxrayfilm82b

Sulaiman

Sun Jan 13 2008, 06:07PM

Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141

I'd guess that the arcs grew on both sides simultaneously until they reach the edge of the film and 'join-up'

Mates

Sun Jan 13 2008, 10:41PM

Registered Member #1025 Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566

Ok, any idea what it is and how it was done?

Tesladownunder

Sun Jan 13 2008, 11:15PM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

Sulaiman wrote ...

I'd guess that the arcs grew on both sides simultaneously until they reach the edge of the film and 'join-up'

I have a different take.
At time 0 prior to spark formation, there is a sort of uniform electric field that exists around the film.
A spark leader begins to form guided in part by cosmic ray ionisation trails. (look at a cloud chamber to see these - they are everywhere)
As it does so, any localised current flow will distort that field locally. A flow of charge will result in an opposite charge on the other side of the dielectric film just like a capacitor.
So if there is a flow of electrons with negative charge, then there will be a localised track of positive charge on the other side which will attract the flow of electrons when they get around there.

Mates wrote ...

Ok, any idea what it is and how it was done?

Kirlian photography. Corona on a photographic film. Nice. I've not seen anyone do that here if that is what it is.

TDU
ps Bear in mind the title of the thread.

Mates

Sun Jan 13 2008, 11:29PM

Registered Member #1025 Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566

Tesladownunder wrote ...

Kirlian photography. Corona on a photographic film. Nice. I've not seen anyone do that here if that is what it is.

TDU
ps Bear in mind the title of the thread.

Sorry TDU I know it is your thread; I could not help myself because those pictures are so close to what youâ€™ve just posted. It is also an X-ray film which was placed between two high voltage electrodes (200KV) and single discharge was performed through it. Than the film was developed and shined through with a very strong light source (otherwise is completely black). Thus I would rather call it Lichtenberg figure than a Kirlian...
BTW: No more intruding pictures - I promise

Tesladownunder

Fri Feb 29 2008, 03:48PM

Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424

Time to wake this thread again.

Mystery 83

CT2

Fri Feb 29 2008, 05:32PM

Registered Member #180 Joined: Thu Feb 16 2006, 02:12AM
Location: Ontario, Canada
Posts: 187

LED's at night, look like the ones u can attach to your waist/arm for safety when biking?

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