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Re: Re:High speed Tesla spark photographs - A summary of developments
Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
Hi Peter,
At 07:33 PM 10/5/2006, you wrote:
.......
Starting to work on my new "secret weapon" soon too.
:-)))))
Terry has made up his own superfast rotating mirror unit (10,000
RPM) and is also getting great results. He is planning a
voltmeter/current meter for his unit as below.
.............
Peter
It actually goes to near "50,000 RPM" with the 300A(!) stall current
motor being run at "only" 2X voltage :o)) But I only take pictures
at around 10,000 RPM. The motor is really scarry at 50,000 =:O I
ran it up there once with the mirrors and all (NOT the camera!) and
it was sort of like a jet engine!! But it held together fine!! I
may have bent the motor shaft "just a little" pressing the mirror
block on it at 4000 pounds and tapping with a hammer... Like the Egg
of Columbus thing... It just "finds" its center highest "Q" of
rotating mass...
I removed the safety Lexan shield now since it "got in the way". The
camera lens is now very close to the spinning mirror:
http://drsstc.com/~streakcam/instruments/StreakCamera2-02.JPG
(mirror "was" spinning there, but "cheap cam" is "fast" and froze the image)...
http://drsstc.com/~streakcam/instruments/StreakCamera2-01.JPG
If it blows the old camera lens out, I could get one of these ;-))
http://www.olympusamerica.com/cpg_section/product.asp?product=1268
I have not done much for a long time now..., but I did manage to
order parts and started work on the streak camera "oscilloscope"
today :-))) Here is what I have so far:
http://drsstc.com/~streakcam/instruments/BarScope-01.JPG
The "Light Bar" has 24 high brightness LEDs. Three green ones define
the top, middle, and bottom of the scale. 20 red LEDs fill in the
bare graph scale on the +-5 volts at 0.5 volt increments. There is
an extra green LED which will have the 100.0kHz calibration scale
function. The holes were drilled in 0.75 inch angle aluminium to
0.192 inches and the LEDs are "pounded" in with a bit of 1/4 inch
tubing "very tight". The LED spacing is 0.375 inch. The front was
sprayed with matt black. The assembly is 9.75 inches long.
A proto board will hold the LM319s (all of them "cost less" than just
"one" of the green LEDs!), the +-5V regulators, and the LMC555
circuit. I need to figure out how to do the voltage divider array
and the LED drop resistors. That will be easily "creative" ;-))
I have two 9V batteries for +- 9V and 4 AA batteries to drive the
LEDs. There is a block for the +-5V input and a power switch. I
will sandwich it between copper FR4 board material cut to suit for
HV/RF shielding. Running the circuit should not be any problem at
all considering what I have done before ;-))
http://hot-streamer.com/temp/DaveTest-82.jpg
http://hot-streamer.com/temp/DaveTest-83.jpg
http://hot-streamer.com/temp/DaveTest-84.jpg
It should be able to sit on top of the toroid will a little aluminum
foil field control stuff. Almost any CT can go into it. I have TI
ICs which should go to 1MHz, and if they blow, they are $0.20
each... I will sprinkle in caps and 24V TVSs as needed... Should be cool!!!
Cheers,
Terry