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Registered Member #54278
Joined: Sat Jan 17 2015, 04:42AM
Location: Amite, La.
Posts: 367
800V sounds a bit low...
Assuming Ko=22.55 ohm-amp^.5 then: 1) for Xenon gas the pressure is 838 Torr 2) for Krypton gas the pressure is 1500 Torr ...do these values seem high to you? (not to sure about the Kr). What do the inside tips of the flashlamp electrodes look like?
If a 'Xe' fill of 450 Torr is assumed for your lamp, this gives a dynamic impedance: Ko=19.99 ohm-amp^.5
Registered Member #2989
Joined: Sun Jul 11 2010, 12:01AM
Location: UK
Posts: 94
There will be some extra polycarbonate around the thing + I will be in another room
I like the idea of working back to find the gas pressure (I never though of that) but it seems a slight error in length or bore size will lead to large differences in pressure. For the two lamps I have, both tested at 400A (assuming arc length=140 & d=9) V&I figures from lamp box 451v would give Ko=22.55 838Torr 454v would give Ko=22.7 866Torr It measures more like 142mm between electrodes but I can't tell the inside diameter, so I would think it's more likely to be 450Torr Xenon (I hope) . From the PerkinElmer flashlamp catalog under fill pressure it says usually pressures greater than 760torr are only found in small lamps 3-5mm bore. When I get round to it I could apply a high voltage and see where it starts to conduct, there must be a bit of difference between 450&838torr the electrodes look fat and rounded but this is just from memory
As for the 800v I intend to use a simmer and square wave drive to power them.
Registered Member #54278
Joined: Sat Jan 17 2015, 04:42AM
Location: Amite, La.
Posts: 367
Actually, this energy level is relatively small for a this size lamp (but keep the safety measure!) I have driven a 6" x 3/8" ruby with 5kJ, but the energy levels ARE scary--I think something like 50j or less is considered lethal.
If it was me, I think I would assume it was Xe at 450 Torr, especially with rounded electrodes. Most krypton flashlamps I have seen have one sharp pointed conical electrode...and xenon flashlamps drive ruby rods just fine. Yes, I have found that a small change in some of these variables have a large impact on others.
Don't forget the inductor (I consider this by far the most important circuit component). I like to use a coil of the "Brooks" configuration. A winding that maximizes inductance for a given length of wire.
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Flash lamp