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Registered Member #354
Joined: Thu Mar 30 2006, 10:12AM
Location:
Posts: 55
Tesladownunder wrote ...
I am having trouble understanding the 24us discharge. Could you confirm the scope readings and scale and what they represent. What are you reading the voltage of anyway. It doesn't look like an exponential decay curve. I suppose if each cap is 50nH then you have a 200nH setup. Which could explain it. Larger caps will increase this. If you had 500J at this inductance you would be able to crush cans.
Measure exact current is very difficult work: resistance and voltage changes a lot through the time
I did this in order to have an approximate idea of how much current I have: Imed*Vmed*t(vmed)=100Joule I will look for a more clear plot
There is not an usual exponential decay because resistance and inductance vary with time while the wire is exploding. Also I have never seen reverse current
Perhaphs I can see if it is a len flare or sonoluminiscense by using two cameras: if both cameras photo has the violet ball in the same position, it exist But by using Murphy law if I put both cameras the phenomena will not happens
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
I'd suggest you sheild the bright flash for one of the cameras, otherwise you'll just get a lens flare on both cameras. I would think photographing something like that, it's difficult to avoid lens flare anyway, no matter how good the lens...
Registered Member #354
Joined: Thu Mar 30 2006, 10:12AM
Location:
Posts: 55
I am thinking about current measurement by using a square loop in parallel with the wire. As long as my capacitor bank is more little than tesladownunder, it may be my duty. I will calibrate by using a resistor bank and post the data.
Of course if there is a len flare I would have on both cameras, but if the cameras are in different angles and the phenomena happens, both cameras will see it in the same position with respect the target but if it is a len flare, it would be seen in different positions because len flare position may depend on lens angle. I think a len flare is made by reflection of light between lens so I do not understand that the violet globe is well focused
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Lens flare is common if you take a pic of a bright source against a dark background.
Here is a time exposure on the moon. The second pic is a view down one of my lens's which has 10 elements many of which will have antireflective coatings. Note the different colours.
Registered Member #354
Joined: Thu Mar 30 2006, 10:12AM
Location:
Posts: 55
I have more 100 Joule discharge photos:
In the first photo reactor piece was incandescent during falling and then it blasted because I could not find it In the 3th photo great magnetic field make charged wire pieces to move erratic (left of image)
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Easy 340Vdc capacitor bank and charger
