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[Digg] The unblinking eye of our machine conquerors subjugates all! - Adventures in Engineering — LiveJournal
The wanderings of a modern ronin.

Ben Cantrick
  Date: 2006-03-25 22:50
  Subject:   [Digg] The unblinking eye of our machine conquerors subjugates all!
Public
  Mood:^o^

the UNBLINKING EYE OF PAIN


http://news.com.com/2300-1008_3-6053812-1.html?tag=ne.gall.pg

A brainwashed human slave inspects the UNBLINKING EYE OF PAIN, which will be used by our future robot masters to cast fire and agony down upon our weak, feeble flesh. Mounted on a 747, the UNBLINKING EYE OF PAIN is a chemically pumped megawatt class laser capable of melting steel in milliseconds, and a human face in much less.

All hail the new metal race! Death to the puny fleshlings! Victory to the machines!!
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osmium_ocelot
  User: osmium_ocelot
  Date: 2006-03-26 00:04 (UTC)
  Subject:   (no subject)
technicality... it actually takes more directed energy to fry a face than a piece of plate steel.
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Ben Cantrick
  User: mackys
  Date: 2006-03-26 00:57 (UTC)
  Subject:   Numbers?
It was a silly post, of course, intended as a joke. But now you've got me wondering...

http://www.kernlasers.com/metal_cutting.htm says that CO2 lasers from 100-400 watts are used to cut metal, and these lasers are also focused down to a very small area by a lens.

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11360423&dopt=Abstract says that a much more diffuse 17 J/cm2 @ 70 watts is enough to blast epidermis off for laser skin rejuvination treatments.

Metal is also laser-reflective. In fact it's difficult to cut aluminium with a laser cutter because of this. Skin is about 70% water and the rest mostly collagen, and absorbs laser energy pretty well.

Though I'm not about to try it, I suspect if I put my hand under an industrial laser cutter, it'd burn though much faster than a similiar thickness of steel.
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Alex Belits: iskra
  User: abelits
  Date: 2006-03-26 08:02 (UTC)
  Subject:   (no subject)
Keyword:iskra
The true name of that 747 would be Suicide Mission -- there is no way it will ever survive a battle because no one among the enemy would fire at anything else until it's down.
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osmium_ocelot: Priss Poster
  User: osmium_ocelot
  Date: 2006-03-26 01:59 (UTC)
  Subject:   (no subject)
Keyword:Priss Poster
CO2 lasers deliver most of their energy as pure heat and as far as I know are the work horses of industrial metal cutting. Water doesn't have nearly the same level of heat absorbtion (I forget the specific scientific term for a substances specific ability to absorb input heat energy) as say stainless steel.

I was told a story about an industrial laser technician who decided to _hold_ the polymer test block when checking the focus on a machine he'd been sent out to service (instead of following procedure and setting it up on a platform as required). The focus was dead on, the aim however, was _not_. He ended up with severe burns, but eventually recovered. No hole in his arm.

As for epidermal skin rejuvination, all they're doing is blowing off dry dead skin anyway. Not so hard when your target is dry.

It may not take as much energy, but it takes a longer exposure. So I suppose, to make my original statement correct, it should probably say "it takes more directed energy to fry a face than a piece of plate steel in the same amount of time."

I'm not pointing this out to be a butthead, or to insist that I'm right. It's just that I find it to be an interesting and odd tidbit of information that it's easier to burn a hole in a piece of metal than it is to burn a hole in a person.

And yeah, i realize it was supposed to be a silly post, and I laughed (on the inside); but as I said, I think it's interesting.

This, of course, would make Priss's railgun spikes more deadly against human targets than her laser. It may also be why Sylia uses mostly laser and melee weaponry on the hardsuits; a stray shot has less chance of causing fatal harm to an innocent bystander (though god help you if you're a firebee pilot).
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Alex Belits: iskra
  User: abelits
  Date: 2006-03-26 07:58 (UTC)
  Subject:   (no subject)
Keyword:iskra
Actually CO2 laser produces infrared light, and water absorbs it pretty well.

And this is what is used to cut my servers' cases -- when the metal shop switched from punch presses to a laser cutter I was able to change parts to a more complex shape.
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osmium_ocelot
  User: osmium_ocelot
  Date: 2006-03-26 16:51 (UTC)
  Subject:   (no subject)
okay, infrared does not equal heat. My poor use of words. However, the main effect of infrared radiation on an object is to cause it to heat up, and while water does absorb it pretty well, it doesn't absorb it nearly as well as something like steel or aluminum.
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