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Photographing Exploding Edibles 252

Posted by michael from the nailed dept.
Isaac Skibinski writes "Remember gawking at photos of bullets going through apples (and the pretty fruit gibbage)? We've recently built an apparatus to capture similar results, using a BASIC controller stamp, a disposable camera flash, an air compressor, an electronic sprinkler valve and some pipe. Considering the cost of the device, it has allowed us to take suprisingly crisp photos of high-velocity objects."
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Photographing Exploding Edibles More

Photographing Exploding Edibles

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  • Once again (Score:2, Funny)

    by CGP314 ( 672613 )
    Considering the cost of the device, it has allowed us to take suprisingly crisp photos of high-velocity objects.

    Funding for this research was provided by porn co.


    --
    In London? Need a Physics Tutor? [colingregorypalmer.net]

    American Weblog in London [colingregorypalmer.net]

  • And I wonder... (Score:5, Funny)

    by Lobsang ( 255003 ) on Thursday January 22, 2004 @09:24AM (#8054345) Homepage
    How many times he heard his mom screaming "STOP PLAYING WITH THE FOOD!"

  • Bandwidth to spare? (Score:3, Funny)

    by kidgenius ( 704962 ) on Thursday January 22, 2004 @09:24AM (#8054346)
    If you want any of these pictures in a larger format, take a look here You really are just begging and pleading for a ./ing aren't you?

  • "Images in science" (Score:5, Informative)

    by MrSpiff ( 515611 ) on Thursday January 22, 2004 @09:26AM (#8054368) Homepage
    there are similar highspeed captures and a lot more fantastic photography and articles in this book from the swedish Karolinska Institute (http://www.imagesinscience.com) sadly only available from http://kup.ki.se/publications/images_sciences_en.h tml

    • Re:"Images in science" (Score:5, Informative)

      by aheath ( 628369 ) <adam@heath.comcast@net> on Thursday January 22, 2004 @09:58AM (#8054682)
      The photograph of the apple and the bullet [stanford.edu] is the work of Harold E. "Doc" Edgerton. [mit.edu] "By synchronizing strobe flashes with the motion being examined (for example, the spinning of engine rotors), then taking a series of photos through an open shutter at the rate of many flashes per second, Edgerton invented ultra-high-speed and stop-action photography (1931)." See Exploring the Art and Science of Stopping Time [mit.edu] for more information on Harold Edgerton's life and work.
      • I found it a bit ironic that neither the page nor the slashdot article mentions that they're at MIT (or, at least, the page is, and I'd guess the people are, too), which is where Doc Edgerton (whose first name was only discovered after his death) worked. Furthermore, Doc's photo isn't even hosted at MIT, but rather at Stanford.

      • Re:"Images in science" (Score:4, Interesting)

        by rpi1995 ( 595968 ) on Thursday January 22, 2004 @12:17PM (#8056408)
        I once went to a fabulous exhibit of his work, and it really covered an amazing range of subjects. People kicking footballs (interesting deformations), hitting golf balls, bursting balloons, and of course, shooting fruit and playing cards.

        One of the most interesting things was research into nighttime arial photography of germany during the war. He was an expert on high power flashes, and that was part of the project. Didn't work because it wound up lighting up the whole sky, and giving it all away.

        The best quote was when someone came into his lab to ask if they had a deck of playing cards to lend out. His answer was "Nope, shot 'em all up."
      • Invented?

        Can you say - Mueybridge? Like, 100 years ago?

    • Re:"Images in science" (Score:5, Interesting)

      by Cyclotron_Boy ( 708254 ) on Thursday January 22, 2004 @10:58AM (#8055289) Homepage
      I also took a lot of pictures of Exploding Apples. [umich.edu] However, where this kid used a pneumatic gun and a flash camera, we used large pulses of current. In peak shots, we exceeded 2GW through the apples. Needless to say, they didn't make it. [umich.edu]
      The biggest difference between our methods, though, is the flash. Nails hitting the apples didn't produce any light, so he wouldn't get an image. We sat with the shutter open in a dark room as well, but all of our shots were simply lit by the light from the explosion. Note how the apples seem to be lit from within... Spooky. Here's a gallery [umich.edu] of the various experiments in our HV lab.
      -F

  • Man.... (Score:5, Funny)

    by Em Emalb ( 452530 ) * <ememalbNO@SPAMgmail.com> on Thursday January 22, 2004 @09:27AM (#8054374) Homepage Journal
    A button is hit, telling the micro-controller to open the valve, thus releasing the pressure and sending the waiting bolt hurdling forth at around 150 m/sec

    His ping times suck!

  • Easy to do using a sound-trigger (Score:5, Informative)

    by vijayiyer ( 728590 ) on Thursday January 22, 2004 @09:27AM (#8054376)
    There is a lot of information on building a sound-triggered system at http://www.hiviz.com/ [hiviz.com], along with some photos.

  • Exploding Fruit (Score:5, Funny)

    by sboyko ( 537649 ) on Thursday January 22, 2004 @09:27AM (#8054377) Homepage
    There's got to be a research project in here somewhere... "Citrus Fruits and Their Implosion Properties". Maybe Apple would sponsor it.

  • Not so bad (Score:5, Interesting)

    by CGP314 ( 672613 ) <CGP@NOSpAM.ColinGregoryPalmer.net> on Thursday January 22, 2004 @09:27AM (#8054379) Homepage
    don't sit too close to the end of the barrel, like Isaac did.

    That's not so bad. The real Isaac stuck a knife in his eye [physicsforums.com] just to see what would happen.


    --
    In London? Need a Physics Tutor? [colingregorypalmer.net]

    American Weblog in London [colingregorypalmer.net]

  • Sounds like (Score:5, Funny)

    by Orion442 ( 739483 ) on Thursday January 22, 2004 @09:27AM (#8054384)
    using a BASIC controller stamp, a disposable camera flash, an air compressor, an electronic sprinkler valve and some pipe

    MacGyver got a new hobby....but where's the duct tape???
  • Comment removed based on user account deletion

  • Bless you! (Score:2, Funny)

    by Bish.dk ( 547663 )
    Gesundheit! [mit.edu]

  • Great. (Score:2, Insightful)

    by benlinkknilneb ( 708649 )
    Just in case I ever wanted to know how to take a picture of exploding fruit... just the kind of thing I've always wondered how to do.

    Seriously, it IS pretty cool though.

  • Nail Gun (Score:4, Insightful)

    by DRUNK_BEAR ( 645868 ) on Thursday January 22, 2004 @09:31AM (#8054435)

    They are using a nail gun in what seems to be a garage or a basement... I wonder if they ever considered what would happen if the shot would miss the carpet they put behind.. to put it in their own words, the bolt could "go across the room, bounce off of various objects, and become swiftly lodged into our soft brains".

    For better security, I would suggest automating the whole process a bit further, get out of the room and see the results when done... but may be I'm just paranoid...

    • ...to put it in their own words, the bolt could "go across the room, bounce off of various objects, and become swiftly lodged into our soft brains".

      Sure, but they'd have a perfect photo of it!

    • but may be I'm just paranoid...

      Probably. Remember, whatever doesn't kill you makes you stranger.

    • For better security, I would suggest automating the whole process a bit further, get out of the room and see the results when done... but may be I'm just paranoid...

      Pffft, and you're the kind that never played with fireworks, right? "Safe" is relative and if you're careful you can push the boundaries.

      Getting in your car and riding around is more dangerous since you're trusting other morons not to kill you.
  • I'm sure it has lot of uses, apart from taking pictures of exploding food. Maybe the military could use it to confirm kills? When somebody is exploded, they could automatically take photo to make sure the enemy is dead.

    Or if camera in public places could take photos automatically when people shoot guns, so that they can get pictures of murderers faces? Kind of like a speed camera, but for shooting.
    • Yeah and we'll just make sure they let us know they're gonna shoot someone so we can setup the BASIC switch and put the piece of cardboard in front of their guns so when they fire the guns it sets off the camera.
  • Honestly, If you're going to build a homemade weapon, build a railgun.

  • bringing extreme sports to the kitchen (Score:5, Funny)

    by Arathrael ( 742381 ) on Thursday January 22, 2004 @09:37AM (#8054514)
    This has potential - kebab-making for the extreme sports enthusiast.

  • Flash Speed (Score:5, Informative)

    by Detritus ( 11846 ) on Thursday January 22, 2004 @09:40AM (#8054533) Homepage
    I thought that one of the advantages of the Edgerton setup was that he used a fast strobe, something on the order of 1/200,000 of a second. This produced much better detail than a generic camera flash unit.

    If I remember correctly, he used a camera with an open shutter in a darkened room, triggering the strobe with the sound of the muzzle blast and an electronic delay.

    • Harold Edgarton also has book published about his work called "Stopping Time". The photos are amazing. He did so much more than shooting bullets through cards and apples. My favorite is the pictures in the back of the book from an atomic bomb test. He was able to capture images of the explosion from several miles away as the fireball grew from a small ball engulfing the top of the metal tower on which the bomb sat to a ball that then englufed the tower and began reaching the ground.

      Simply amazing photos in
    • In this experiment flash speed doesn't matter much. Their cannon is a low velosity device. Just how much does the air slow down going from a 3/8ths air compressor hose into a 1 inch pipe. They have no local surge tank behind the sprinkler valve so their hose orface size is a big speed limiter. Therefore they can get by with using a photosresistor sensor (very slow rise time) instead of photodiode or break wire, a microprocessor (more delays) a mechanical relay (need I say more?) and they still need to p
  • I built one of those slave flash thingies somewhere in the mid '80s ... combined it with a microphone and a old Praktica reflex camera...
    (total kit was about $80 worth of cam and electronics...)

    I had about the same results, only then using black and white photo's.

    I think I am going to start one of those sites too. I am just as much a nerd as these guys!

    • I am just as much a nerd as these guys!

      In the mid '80s I was around 5 years old - Please share your nerd exploits with the younger generation so we can bask in your geekiness and strive for perfection.

      No, seriously, please do put a site up. Just let me know before it gets posted on /. (Unless you have some Uber-MIT-bandwith).

  • So very cool (Score:2, Interesting)

    by 6.023e23 ( 738640 )
    The most amazing thing is the low cost. While it's not as hi-tech as some hi-speed photography (such as with bullets), it's simple, easy, and can allow for live demos of the concept. Not to mention it allows geeks on a budget to make very cool toys.

    My thoughts start heading toward what other fun (AND educational ;-) ) things can be done with the strobe photography rig besides blowing up fruit...

    (I think I see $40 leaving my wallet in the very near future)

  • This immediately brings to mind the time at the end of a college party we ended up placing bets on how long it would take an egg to explode in a microwave.

    I know it's dumb, but I sometimes I wish I could go back to those days of having such little responsibilities and being entertained so easily ...

  • How to REALLY defend yourself against an attacker bearing fresh fruit!! Using a bolt gun is cool, but I wonder if they could rework the system to be used with a cannon...

  • WOOHOO!! (Score:2, Funny)

    by MongooseCN ( 139203 )
    I just viewed ALL the photos on the site BEFORE it got slasdotted! Where's my award?!

    • Re:WOOHOO!! (Score:3, Informative)

      by Giant Killer ( 33130 )
      well, this is hosted on the mit.edu web server. i would hope that of all web servers on earth, mit's could survive a slashdotting.
  • Maybe tidy up the "lab" a little next time? You are being /.'d after all.

  • I feel dirty... (Score:3, Funny)

    by IceAgeComing ( 636874 ) on Thursday January 22, 2004 @09:53AM (#8054634)

    Watching an exploding lemon, caught endlessly in the throes of passionate destruction, well...it feels a little pornographic, doesn't it?

  • Ob. link to the Doc (Score:5, Insightful)

    by cmcguffin ( 156798 ) on Thursday January 22, 2004 @09:53AM (#8054635)
    This kind of high-speed stroboscopic photography was pioneered by Harold "Doc" Edgerton [mit.edu]. You've undoubtedly seen some of his images [ucr.edu].

    He was a MIT professor, prolific inventor, artist [edgerton.org] and by all acounts an incredibly nice person [mit.edu].

    He's also responsible for one of my favorite quotes:

    Work like hell
    Tell everyone everything you know
    Close a dread with a handshake
    Have fun

    • >Close a dread with a handshake

      That's what I get for cutting-and-pasting.

      Obviously, that should be, "Close a deal with a handshake."

    • Re:Ob. link to the Doc (Score:2, Interesting)

      by gkuz ( 706134 )
      incredibly nice person

      Not just nice, but a great teacher as well. I took the strobe photography lab, and even though he was semi-retired he always hung around and would offer helpful but non-judgemental advice to anyone.

      But what I thought was far cooler than the bullet-through-object photos, which were so easy you did them in the first few weeks, was the pictures of an exploding firecracker. Since it generates its own light, you can't use the darkened-room-with-fast-flash approach, but have to use far m

    • At least he made the resulting photos pleasing to look at before having them shown to the masses... having plain backgrounds, nice lighting etc.

      The ones in this article look quite frankly shite, with bits of apparatus hanging around etc.

      Sure, your test shots can have that kind of junk around, but if you want to impress people put up a damn sheet or something people!
  • Just what college students need. A cheap, easy assemble setup that allows them to take pictures of things being destroyed at high speeds.

    I give it a month before somebody kills themselves with it at a party whilst trying to perform some trick involving the device, a keg, and someone doing a kegstand atop it.

  • Needs One Thing (Score:2, Insightful)

    by Beardydog ( 716221 )
    Stereo images. Splatter in 2D is nice, but splatter in 3D is heavenly.

  • Cool idea, bad subjects (Score:2, Interesting)

    by vlauria ( 14396 )
    These guys went through all that trouble and are only shooting a nail through a cracker? Come on, there are so many cooler things then that.

    - Nail into water ballon
    - Nail through fragile glass
    - Nail into steel (watch nail bend)
    - Nail into neighbors cat (okay, maybe not such a good idea)

    We could even make it a /. poll.

  • Some more photos (Score:5, Informative)

    by leoaugust ( 665240 ) <leoaugust AT gmail DOT com> on Thursday January 22, 2004 @10:04AM (#8054723) Journal
    Here are some more frozen-time photos
    • Has anyone ever seen slow time imagery of a popcorn kernel popping? I've been looking for that for years.

      • Re:Some more photos (Score:3, Informative)

        by Lars T. ( 470328 )
        The German TV show for kids "Sendung mit der Maus" once filmed popcorn with a high-speed camera. Maybe you can find that on P2P (search for either "Sendung..." or "Sachgeschichten"). You could buy it on this tape [wdrladen.de], but that's Euro 15.90 and in PAL.
  • I *SO* hope my son ends up doing stuff like this when he gets older. At least this project produced some cool arguably scientific evidence. We only ended up with messes or trying to figure out good alibis.
  • This a good example of modern times: "digital is better" and it reminds me of those Nikon, Canon, etc. ads in the early eighties about their lenses being designed "with computers". So then they should be better, yeah.....

    If you need a 5 ms delay, why not simply use an RC circuit (for the new kids on the block: that's a resistor and capacitor) and if you really want to "go digital", a simple 50 cents 78xx or 40xx counter chip would have done the trick. Mmm, but if you're grown up only knowing that you need

    • Re:Going digital .... (Score:3, Insightful)

      by HeghmoH ( 13204 )
      So you need a five ms electronic delay. Do you:

      1) Write a short program using a microcontroller you already have.

      2) Go out and buy some electronics and build a little delay circuit.

      Would you really forego the simpler solution just because it's 'overkill'?

  • Reminds me... (Score:5, Interesting)

    by JediTrainer ( 314273 ) on Thursday January 22, 2004 @10:13AM (#8054804)
    I have an uncle who assists police with forensics work (he's a dentist during the day, but the town he lives in is small and they need all the help they can get).

    One thing that stumped the police was a scene where a single bullet came through the windshield of a car and hit the driver.

    That in itself wasn't surprising. What was surprising is that the back of the guy's head got completely blown off - a really huge hole that they couldn't explain at first.

    So they did an experiment using high-speed film/camera in a lab, where they got a few windshields to play with and a few human skull mockups, and a gun with bullets of the same make/model as the one they've identified.

    I saw a copy of (one of the) pictures they took, which was quite amazing (yet horrifying if you think what happened) - a giant cone of glass shards projecting outwards from where the bullet entered the windshield. The cone was small near the front of the driver's head, but while passing through the skull it continued on its outward path and blew a massive hole in the back.

    Scary stuff.

    • One of Penn & Teller's books had a demonstration like this. They wanted to debunk the conspiracy theorists that don't believe that a shooter from the schoolbook depository building was responsible for killing President Kennedy, on grounds that his head snapped backwards -- towards the building -- and his face was more damaged than the back of his head.

      According to Newton's laws, this makes sense though: if every action causes an opposite reaction, then it would make sense for the head to bounce back i

  • once built something similar (Score:5, Informative)

    by SuperBanana ( 662181 ) on Thursday January 22, 2004 @10:14AM (#8054810)

    A friend and I once built a sprinkler-valve based widget that was quite impressive. In our first test, however, we left the barrel off, and the resulting pressure wave nearly deafened us. Those valves flow pretty well...

    You know how they tell you to shoot stuff into a hanging blanket, because it 'catches' the object? Our first 'victim', a magic marker, went THROUGH the blanket and was never seen again.

    We developed the world's fastest(and messiest) french fry maker(use your imagination- sporting goods involved)...shot a 4-foot broom handle a couple hundred feet into the air and down his yard(looked like a mini-cruise-missile)...discovered it made an excellent fire extinguisher(fill barrel with water, cork, aim, blammo- between the gust of air and the water/steam, you could do a serious number a good sized fire with just two cups of water)...etc. You could even launch cylinders of compressed snow(trick is to compress it enough that it doesn't disintegrate on launch, but doesn't hurt anyone/anything when it impacts..although ice rods looked awesome fired at a brick wall).

    The best was when my friend's parents got home. His mother walked out onto the porch first. "Oh my GOD, what are you DOING?" His father followed, saw the compressor, air tanks, etc..."Oh cool, whatcha guys doin'?" :-)

    • Yeah, similar until the cops come. (Score:5, Funny)

      by medscaper ( 238068 ) on Thursday January 22, 2004 @11:36AM (#8055844) Homepage
      I had a similar experience.

      I decided, at my 8-year-old's insistence, to build a tennis ball thrower for my 2 year old Yellow Lab. I went and found some parts - basically two 2-foot lengths of 2" PVC, some various PVC connectors, a switch box with a 9 volt battery, all wired to a sprinkler valve between the two pieces of PVC. It looked like an awkward "U" of PVC and electronics taped together.

      One of the PVC tubes had an endcap with a welding pressure guage threaded into it, along with a brass air valve. The PVC was rated at something like 400 psi. But, I figured, for my test, I would stick to something low, like around 35 or 40.

      So, I'm out in the garage, dog anxiously at my side, filling up the pressure tube to about 45 psi. I let it sit, stood back, and everything seemed to hold well for about 60 seconds, so I thought, "Yeah, this is safe. Cool!"

      I started looking around for the tennis ball I've brought with me to take it outside and try it. I turned around to pick it up off the floor, and there was this HORRENDOUS BOOM!!! followed by some crashing around and various things falling off of shelves.

      I collect my thoughts, and after making sure all my limbs and digits are still on, I look over at the garage door. There is a large, pumpkin-sized dent in the door - about 5 inches deep - with a beautiful hole about the size of the $40 pressure guage at the center of it.

      I looked around for the dog, who'd been at my side, and found nothing but a cute little urine trail off into the corner of the garage where the dog was cowering.

      Jesus. What the hell happened?!? Apparently, the glue wasn't quite dried on the PVC - it was only about an hour old, and the end of the pipe blew off, putting a huge dent in my garage door, and blowing the rest of the contraption back across the shop, knocking down canning jars and various stored things.

      So, I coaxed the dog out of the garage for a few minutes, and walked out into the sunlight to shake my head and give up on this, and hear, "Hello?!? Everyone OK?!" It was a COP!

      Apparently several people had called about the shotgun/explosion/whatever and the cop was highly concerned. Nothing like seeing a cop, gun drawn, coming aroudn the corner of your house.

      Anyway, I was told in no uncertain terms that it was illegal to play with any of this stuff (yes, even only compressed air) within city limits, and...well...I can see why.

      Poor dog. I just throw the ball, these days.

    • ...discovered it made an excellent fire extinguisher(fill barrel with water, cork, aim, blammo- between the gust of air and the water/steam, you could do a serious number a good sized fire with just two cups of water).

      This technique is now being used by firefighters to fight high-temp fires that are inaccessable by vehicles, such as in tunnels. Three or four blasts from the backpack fire extinguisher into a fire that's melting cars, and you can walk right into it. No weird chemicals needed either.
  • Hmm Im thinking that if they managed to build this for 40 dollars, adding more digital cameras in a circular array one could make some very nice 3d rotating views of the aforementioned fleshy fruits exploding.
  • I could have sworn that instead of seeing "Photographing Exploding Edibles", that the title was "Photographing Exploding Bibles".

    For a brief moment I thought "Forget the camera, get an exorcist!"

  • Did it occur to any one that the use of the BASIC stamp was over kill. I'll agree it makes the project a little bit easier but these guys are MIT students. All you seriously need is a photo sensor, a transistor, an op-amp and a relay. Very simple. The only tricky part is that using this simple circuit would require precious placement of the photo sensor. This shouldn't be a problem if you know the velocity of the projectile which they know. You'd think some MIT nerds would have done it this way which

  • More exploding fruit & stuff (Score:5, Interesting)

    by tylernt ( 581794 ) on Thursday January 22, 2004 @10:41AM (#8055099)
    Only these guys used real guns, no some sissy PVC contraption: http://www.bitpress.com/dc/ The 7 cans is my favorite. :)

  • Just a link for your viewing pleasures (Score:4, Interesting)

    by Mika_Lindman ( 571372 ) on Thursday January 22, 2004 @10:50AM (#8055185)
    http://www.rit.edu/~andpph/exhibit-3.html [rit.edu]

    My favourite is the playing card shot half [rit.edu]

  • Coolest /. article in months (Score:3, Insightful)

    by bodland ( 522967 ) on Thursday January 22, 2004 @10:52AM (#8055216) Homepage
    Rover photos and exlploding fruit...

    After all the RIAA, Patriot Act, SCO, Microsoft, Linux legal articles it is nice to relish in why we keep coming back to /.

    Not since the highspeed CD-ROM spinning has there been something as geeky neat as this...

  • Budget solution: (Score:4, Funny)

    by JediTrainer ( 314273 ) on Thursday January 22, 2004 @10:53AM (#8055222)
    1. 8 year old male

    2. All-syrup squishee. Add caffeine to taste

    3. Hand the kid the camera.

    That should be enough for the kid's reflexes to match this elaborate setup.

  • Even better: in 3D! (Score:4, Interesting)

    by ursg ( 196096 ) on Thursday January 22, 2004 @11:29AM (#8055752)

    Using a quite similar approach, the guys from Frozen Reality [frozen-reality.de] take even more immpresive Pictures in 3D.

    Their system is built from 8 identical digital cameras set up in a half-circle around the target object, all triggered by a single flash.

    The images are processed my a morphing program and create stunning movies of exploding balloons, a metal ball crushing a stone plate etc.

  • On low output the duration of a pretty standard flash should be of the order of 1/30,000 second. The awkward part is synchronising the camera so it exposes at the right time. An infra-red beam coupled with a variable delay circuit ought to do, though you might want to use a SLR where you can lock up the mirror so as to reduce shutter latency.
  • PVC is X-ray transparent. Hard to find in your flesh.

    PVC shatters like glass, and is almost as sharp. I cut myself on a shard of broken PVC from a homemade tool a couple of weeks ago. It was so sharp I didn't notice until I saw the blood on my work, wondering where it came from.

    In case of failure, think multiple exploratory surgeries. Often people trying to make noisemakers (pipe bombs or destructive devices to the FBI) end up with bits of glass sharp PVC as permanent companions.

    Also don't forget about
  • To shorten the pulse length you need to quench the main xenon tube earlier. One way to do this might be to put a smaller flash lamp (available at radio shack?) in series with a smallish capacitor and put those in parallel to the main flash lamp. The goal is to trigger the smaller flash lamp as a turn off circuit, it will divert the current into the small capacitor which will drop the voltage across the main flash lamp causing it to stop conducting. The small capacitor will rapidly charge and hence little en
  • considered edible for these purposes? :-/
  • how fast SCO is going out of business?

    Or how fast Microsoft is going to follow?

  • Matrix-style "bullet-time" videos of exploiting fruit.

  • cucumber illumination (Score:3, Informative)

    by Frisky070802 ( 591229 ) * on Thursday January 22, 2004 @09:42PM (#8062433) Journal
    Ages ago, the Digital Western Research Lab (which became Compaq and then merged into HP Labs) had a technical note [compaq.com] and video along these lines... quite funny.

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