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High Speed Streamer Pictures - Even more
Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
Hi All,
Very busy day today!!
Many questions, but not a lot of answers :o))
First the easy stuff... Peter was wondering if my Streak
Oscilloscope's bandwidth was "ok" since some of the readings looked
different than one would expect... So I gave it a check. Here it is
on top of the coil with a signal generator attached:
http://drsstc.com/~streakcam/instruments/ScopeCheck-01.JPG
I do note the small focus angle LEDs on the left are not quite
pointed to the camera and the toroid has reflections (things to do
list...). So I gave it a 100kHz 20% duty cycle square wave at +-4.7V:
http://drsstc.com/~streakcam/instruments/ScopeCheck-03.JPG
So it works "just fine"...
The picture that seems the most exciting is this one!!:
http://drsstc.com/~streakcam/pictures/32/PA090047b.JPG
It appears that the coil fired off three arcs in 30uS
intervals!! That's "33,000" BPS!!! I was thinking it just happened
to hit right during a charging cycle from the PIRANHA drive
system. But "33,000" BPS is hard to believe!! Peter thought it
might just be an overlap of three arcs. But those usually look like this:
http://drsstc.com/~streakcam/pictures/32/PA090009a.JPG
Here is a double overlap in the same mirror (top), but the
calibration markers give it away:
http://drsstc.com/~streakcam/pictures/32/PA090040b.JPG
Plus these fast multi-strikes (or close) show in 5 out of 64 of my pictures...:
http://drsstc.com/~streakcam/pictures/32/PA090022b.JPG
So this multi-strike thing seems fairly common and it is "new"... It
might be something weird just with the SISG PIRANHA coil. Maybe due
to it's long "on-time" or it's powerful charging circuit....
It should be easy to find on a plane wave antenna and a scope if one
goes looking, so I will search for it next session...
The bottom strike in this picture is cool:
http://drsstc.com/~streakcam/pictures/32/PA090063b.JPG
The strike caused a sharp positive "spike" in the scope (0.1A/LED)
when it hit. But there is a significant current build up and down
before and after the hit. It also has a bit of a positive "tail"
which is pretty normal...
http://drsstc.com/~streakcam/pictures/32/PA090059b.JPG
I put a big 13MB PDF file up on rapid share that has 26 cool pictures
in it in high-res. Printer friendly too (use "photo" print to get
the fine detail).
http://rapidshare.de/files/36173555/Hi-SpeedStreamerPhotos.pdf.html
Click on "free" in the lower right. Wait about 60 seconds while they
show you ads about pretty girls :o)... Type in the anti-bot letters
and download...
So it looks like the camera system is getting real well figured
out. I wish I had a much more light sensitive camera like
Peter. Maybe the 10,000 RPM mirror will blast out the lens soon and
give my the "opportunity" to get a better camera :o)) I did find
that at 15,000 RPM the vibration was enough to knock the camera out of focus.
So now I guess it is getting near the time of wondering deeply about
what all this "means"...
Cheers,
Terry