High-speed Videos
tesla500, Fri Mar 07 2008, 07:29AMI just recently completed building a high speed camera (well, got it to a working state so far), see the thread over on the projects board. The camera can record 640x480 @ 250fps, and lower resolutions at higher frame rates, eg 320x240 @ 940fps. Record time is limited to about 0.9sec by the 64MB of ram on the FPGA development board the camera is based on, but that is sufficient for recording most events.
I don't have too much electrical stuff set up to record at the moment, I do have a compressed air gun set up, so most of the videos I have now involve that. I did record a Jacob's ladder though.
To frame through these videos precisely, I recommend playing them in VitrualDub.
Jacob's ladder (3.8MB, XviD)
Record mode: 150x480 1040fps, probably 1ms exposure time, playback rate 20fps
Lighting: Room lights only
Simple Jacob's ladder made with a 15kV 60mA NST. 14AWG wires about 20cm tall. Note the difference in brightness between the two ends of the arc, and how it changes each half-cycle.
This next set of videos involves shooting various things with a compressed air gun. The gun consists of a ~1.5l fire extinguisher tank pressurized to 400PSI with an air conditioner compressor. The air is discharged through a fast opening 3/4" ball valve into a 3/4" dia. 3m long barrel. It fires a 91g projectile at 150m/s (550km/h).
Compressed air gun valve opening (700kB, XviD)
Record mode: 320x240 940fps, playback rate 15fps
Lighting: 500W halogen
The valve opens in about 10mS, and the projectile is in the barrel for about 30ms after the valve starts opening.
Shooting bottles full of water (800kB, XviD)
Record mode: 320x240 940fps, exposure time ~200uS, playback rate 10fps
Lighting: 4 x 500W halogen
If you frame through the video, one frame shows the left bottle bulging out from the pressure created by the projectile pushing the water. This is seen more clearly in the next video.
Shooting 2l bottle very high speed (137kB, XviD)
Record mode: 132x60 7645fps, exposure time 41uS, playback rate 10fps
Lighting: 4 x 500W halogen about 30cm from the target
Similar to the above shot, but with a 2l bottle, and at a much lower resolution to get a higher frame rate. I notice some flashes at the bottom of the bottle just after the bullet goes by. It might be some sort of sonoluminescence, but it's probably just the lights reflecting the off the crinkling bottle. What do you guys think?
Shooting PS, CD, Floppy drive (1MB, XviD)
Record mode: 256x120 2273fps, exposure time 191uS, playback rate 15fps
Lighting: 2 x 500W halogen
Shooting old broken computer components, a power supply, CDROM and floppy drive. I was surprised that the projectile made it all the way through.
Shooting PS board (1MB, XviD)
Record mode: 120x48 10101fps, exposure time 89uS, playback rate 10fps
Lighting: 4 x 500W halogen as close as I dared put them
Shooting a blown "400W" (Yeah, right, that thing would barely handle 150W) power supply board. Very high rate, over 10,000fps.
Popping water balloon (3MB, XviD)
Record mode: 160x320 1404fps, exposure time 260uS, playback rate 30fps
Lighting: 500W halogen about 30cm away
Interesting mushroom cloud effect in this one, only the top section of the balloon popped, squirting water out upwards.
Popping air and water filled balloon (2.5MB, XviD)
Record mode: 160x240 1812fps, exposure time 200uS, playback rate 30fps
Lighting: 500W halogen about 30cm away
Breaking a Record (4.3MB, XviD)
Record mode: 320x240 940fps, exposure time ~200uS, playback rate 10fps
Lighting: 2 x 500W halogen
A record mounted on a angle grinder, shot with the compressed air gun at low pressure to cause it to shatter.
Propane filled balloon (8MB, XviD)
Record mode: 640x480 247fps, exposure time ~4mS, playback rate 15fps, lens iris closed somewhat
Lighting: Room lighting
A balloon filled half with propane, half with air, lit by a Jacob's ladder.
Strobe Light (300kB, uncompressed)
Record mode: 120x80 6257fps, exposure time ~140uS, playback rate 5fps
Lighting: Room lighting
---------------------------------------- -------------
New - March 26th
Shooting block of ice (3.5MB, XviD)
Record mode: 240x160 1812fps, playback rate 30fps
Not too spectacular, the gun barrel exploded shortly after the valve opened. The projectile came out at only 30m/s instead of 150m/s.
With the gun out of commission for now, I set up an old 300V 8000uF cap bank and took some shots with that.
Magnetic coil squish (500kB, XviD)
Record mode: 160x120 ~3300fps, playback rate 5fps
A 26AWG wire coil being squished by the magnetic field generated by the current flowing through the coil.
Wire flip (500kB, XviD)
Record mode: 256x256 ~1025fps, playback rate 10fps
A 18AWG wire being flipped from pointing down to pointing up by magnetic forces.
Water discharge 1 (2.5MB, XviD)
Record mode: 100x240 ~3000fps, playback rate 15fps
A jam jar filled with water, with two 18AWG wires connected to the cap bank touching lightly underwater. The mechanical shock breaks the glass bottle and sends water flying up to the ceiling.
Water discharge 2 (4MB, XviD)
Record mode: 320x240 940fps, playback rate 15fps
Same as above, but different resolution and with a plastic bottle. Notice the cavitation generated just after firing (view frame by frame).
Water discharge 3 (1.8MB, XviD)
Record mode: 180x320 ~1500fps, playback rate 15fps
Wires touching under a small amount of salt water. Water flies up very fast, maybe 200km/h.
Watch for more videos later.
David
Re: High-speed Videos
Wolfram, Fri Mar 07 2008, 09:53AM
Brilliant videos. I am impressed at how good the image quality is, even at 7645FPS. I am certainly looking forward to more videos.
Wolfram, Fri Mar 07 2008, 09:53AM
Brilliant videos. I am impressed at how good the image quality is, even at 7645FPS. I am certainly looking forward to more videos.
Re: High-speed Videos
..., Fri Mar 07 2008, 03:28PM
I love that jacobs ladder video
I would never have thought to point a high speed camera at one of them :p
..., Fri Mar 07 2008, 03:28PM
I love that jacobs ladder video
I would never have thought to point a high speed camera at one of them :p
Re: High-speed Videos
Avi, Fri Mar 07 2008, 03:37PM
why does the "spot" on the JL electrode depend on the polarity.
good videos anyway.
Avi, Fri Mar 07 2008, 03:37PM
why does the "spot" on the JL electrode depend on the polarity.
good videos anyway.
Re: High-speed Videos
Nik, Fri Mar 07 2008, 04:26PM
That spot is visible in a lot of JL pics as along as they have a lot of current going through them. I think it has to do with the positive end of a very hot arc emitting positive ions (copper from pipe or iron from steel wire). So it is a cloud of ionized metal from the JL rails. (See below)
Nik, Fri Mar 07 2008, 04:26PM
That spot is visible in a lot of JL pics as along as they have a lot of current going through them. I think it has to do with the positive end of a very hot arc emitting positive ions (copper from pipe or iron from steel wire). So it is a cloud of ionized metal from the JL rails. (See below)
Re: High-speed Videos
CompWiz, Fri Mar 07 2008, 05:09PM
The JL video was awesome,
you record a tesla coil to see streamer growth.
CompWiz, Fri Mar 07 2008, 05:09PM
The JL video was awesome,
you record a tesla coil to see streamer growth.
Re: High-speed Videos
Bauerb2, Fri Mar 07 2008, 05:47PM
i've always wanted someone to do a jacob's ladder. imagine a tesla coil in slow motion!
excellent job, can't wait to see more.
Bauerb2, Fri Mar 07 2008, 05:47PM
i've always wanted someone to do a jacob's ladder. imagine a tesla coil in slow motion!
excellent job, can't wait to see more.
Re: High-speed Videos
rp181, Fri Mar 07 2008, 11:09PM
Very nice.
You should consider making more in a little box, and sell for alot cheaper than normal ones :)
rp181, Fri Mar 07 2008, 11:09PM
Very nice.
You should consider making more in a little box, and sell for alot cheaper than normal ones :)
Re: High-speed Videos
Mates, Fri Mar 07 2008, 11:16PM
Hi David,
your job you have done is excellent. Please try to think about a possibility to sell your camera either as a "do it yourself kit" or as a completed product (with or without optics and casing). I have a serious interest and maybe more people would be interested too.
Cheers Mates
Mates, Fri Mar 07 2008, 11:16PM
Hi David,
your job you have done is excellent. Please try to think about a possibility to sell your camera either as a "do it yourself kit" or as a completed product (with or without optics and casing). I have a serious interest and maybe more people would be interested too.
Cheers Mates
Re: High-speed Videos
Marko, Sat Mar 08 2008, 07:07PM
Tesla500,
Sir can I recommend a classic, popping a water filled balloon? I think it should look very good at 940fps..
Marko
PS. fixed, jan :p
Marko, Sat Mar 08 2008, 07:07PM
Tesla500,
Sir can I recommend a classic, popping a water filled balloon? I think it should look very good at 940fps..
Marko
PS. fixed, jan :p
Re: High-speed Videos
Dr. Dark Current, Sat Mar 08 2008, 07:54PM
tesla500, very nice videos, excellent work!
Dr. Dark Current, Sat Mar 08 2008, 07:54PM
Marko wrote ...
...pooping a water filled balloon...
I hope you meant popping...pooping a water filled balloon...
tesla500, very nice videos, excellent work!
Re: High-speed Videos
tesla500, Sat Mar 08 2008, 09:33PM
Hey guys,
Some new videos posted, more compressed air gun stuff, and water balloons.
I will eventually either get more of these boards produced, or make a board with everything on it, including extra RAM. Having only 0.9 seconds of record time is annoying.
David
tesla500, Sat Mar 08 2008, 09:33PM
Hey guys,
Some new videos posted, more compressed air gun stuff, and water balloons.
I will eventually either get more of these boards produced, or make a board with everything on it, including extra RAM. Having only 0.9 seconds of record time is annoying.
David
Re: High-speed Videos
teslaguy, Sun Mar 09 2008, 05:55AM
I will buy one.
teslaguy, Sun Mar 09 2008, 05:55AM
I will buy one.
Re: High-speed Videos
Tesladownunder, Sun Mar 09 2008, 02:35PM
Slo-mo pictures are mesmerising. The Jacobs ladder particularly so.
I don't think you will record streamer growth though. With my streak camera a resolution of 5us is needed to distinguish every half cycle of 100kHz for spark growth,
TDU
Tesladownunder, Sun Mar 09 2008, 02:35PM
Slo-mo pictures are mesmerising. The Jacobs ladder particularly so.
I don't think you will record streamer growth though. With my streak camera a resolution of 5us is needed to distinguish every half cycle of 100kHz for spark growth,
TDU
Re: High-speed Videos
CompWiz, Wed Mar 12 2008, 02:04AM
I thought of that right after I posted...
CompWiz, Wed Mar 12 2008, 02:04AM
I thought of that right after I posted...
Re: High-speed Videos
..., Wed Mar 12 2008, 02:50AM
You could cheat and use a SSTC that is running off fullwave rectified mains without a filter cap. Then you have a full 1/60sec to watch the streamers grow. It probably wouldn't be as neat as running a few millions fames/sec to watch individual streamers growing, but judging by the pictures I have got by taking ~1ms exposures it should certainly be interesting.
..., Wed Mar 12 2008, 02:50AM
You could cheat and use a SSTC that is running off fullwave rectified mains without a filter cap. Then you have a full 1/60sec to watch the streamers grow. It probably wouldn't be as neat as running a few millions fames/sec to watch individual streamers growing, but judging by the pictures I have got by taking ~1ms exposures it should certainly be interesting.
Re: High-speed Videos
tesla500, Sun Mar 16 2008, 07:20PM
New videos posted, breaking a record, a propane filled balloon, and a strobe light.
Any suggestions for other things to record?
David
tesla500, Sun Mar 16 2008, 07:20PM
New videos posted, breaking a record, a propane filled balloon, and a strobe light.
Any suggestions for other things to record?
David
Re: High-speed Videos
Dr. Dark Current, Sun Mar 16 2008, 07:25PM
Do you have a capacitor bank?
Some aluminium foil exploding should be interesting.
Dr. Dark Current, Sun Mar 16 2008, 07:25PM
Do you have a capacitor bank?
Some aluminium foil exploding should be interesting.
Re: High-speed Videos
Backyard Skunkworks, Sun Mar 16 2008, 07:35PM
Here a few you could try...
Shattering glass
Oxy-Hydrogen bag going BOOM
Some type of solid explosive doing its thing
Various breakables droping onto a hard surface
Big sparks from a capacitor bank shorting across aluminum foil (ohhh, beat me to it! )
Sparks underwater in de-ionized water
Backyard Skunkworks, Sun Mar 16 2008, 07:35PM
Here a few you could try...
Shattering glass
Oxy-Hydrogen bag going BOOM
Some type of solid explosive doing its thing
Various breakables droping onto a hard surface
Big sparks from a capacitor bank shorting across aluminum foil (ohhh, beat me to it!
)Sparks underwater in de-ionized water
Re: High-speed Videos
..., Sun Mar 16 2008, 08:18PM
that balloon one is amazing !amzed
I would really like to see a video of something being vaporised by a long pulse yag laser (about 1ms pulse btw) to see how the fireball grows; you wouldn't happen to have a ssy-1 laser head around would you?
..., Sun Mar 16 2008, 08:18PM
that balloon one is amazing !amzed
I would really like to see a video of something being vaporised by a long pulse yag laser (about 1ms pulse btw) to see how the fireball grows; you wouldn't happen to have a ssy-1 laser head around would you?
Re: High-speed Videos
Shaun, Mon Mar 17 2008, 03:52AM
Those are some amazing videos so far, especially the balloon ones.
I want to suggest using your air cannon to shoot a full aerosol can. I'd also like to suggest that can be a can of Easy Cheese or whipped cream. I don't know if Easy Cheese is technically an aerosol or not, but its definitely pressurized in some way.
Oh and if you feel like it you can video it, too.
The point is, I shot a 1" ball bearing through one of those with a large air cannon and it was amazing.
Shaun, Mon Mar 17 2008, 03:52AM
Those are some amazing videos so far, especially the balloon ones.
I want to suggest using your air cannon to shoot a full aerosol can. I'd also like to suggest that can be a can of Easy Cheese or whipped cream. I don't know if Easy Cheese is technically an aerosol or not, but its definitely pressurized in some way.
Oh and if you feel like it you can video it, too.
The point is, I shot a 1" ball bearing through one of those with a large air cannon and it was amazing.
Re: High-speed Videos
tesla500, Wed Mar 26 2008, 08:12PM
New videos posted. The air gun's barrel exploded a second time, so that's out of commission until I get a metal barrel. Until then, I set up an 8000uF 300V cap bank and took some shots with that. See the first post.
Once I get the gun working I'll try an aerosol can. Shaving foam or simlar should be interesting.
Unfortunately I don't have a YAG laser.
David
tesla500, Wed Mar 26 2008, 08:12PM
New videos posted. The air gun's barrel exploded a second time, so that's out of commission until I get a metal barrel. Until then, I set up an 8000uF 300V cap bank and took some shots with that. See the first post.
Once I get the gun working I'll try an aerosol can. Shaving foam or simlar should be interesting.
Unfortunately I don't have a YAG laser.
David
Re: High-speed Videos
Ken M., Wed Mar 26 2008, 09:22PM
Like the shootinf of the Ps and cd drives, especialy since its such a clean straight shot then it hits the motor assembly of the 1st cd drive then angles up and hits the 2nd drive. The wire discharge vids are also very impressive especially vid #3 since you see the initial discharge and the explosive results then you see the wires touch 2 more times after the initial explosion and they still discharge with some power. Fantastic videos.
Ken M., Wed Mar 26 2008, 09:22PM
Like the shootinf of the Ps and cd drives, especialy since its such a clean straight shot then it hits the motor assembly of the 1st cd drive then angles up and hits the 2nd drive. The wire discharge vids are also very impressive especially vid #3 since you see the initial discharge and the explosive results then you see the wires touch 2 more times after the initial explosion and they still discharge with some power. Fantastic videos.
Re: High-speed Videos
ramses, Thu Mar 27 2008, 03:22PM
beastly videos, but my computer freezes for some reason when i try to watch them with firefox or IE. AOL worked well enough, though.
ramses, Thu Mar 27 2008, 03:22PM
beastly videos, but my computer freezes for some reason when i try to watch them with firefox or IE. AOL worked well enough, though.
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