View Full Version : Heat beam
07-01-2003, 04:35 PM
Would it be possible to make a machine that would emit a beam of heat energy, said beam tapering off after a set distance?
That would certainly make it easier to mow the lawn . . .
Any input at all would be appreciated!
07-01-2003, 05:11 PM
Like a light sabre, a beam that just goes out so far, then stops abruptly?
No. Not without something to stop it at the other end.
07-01-2003, 05:44 PM
Beam of heat energy = infrared laser.
07-01-2003, 06:07 PM
A high-powered heat gun is pretty effective, but only at very short range. It's basically a blowdryer that's amped up a lot. Good for peeling paint.
07-01-2003, 10:36 PM
Er... all light is "radiant heat." It doesn't have to be invisible.
Put your hand in the beam of a twenty watt CW green laser and see if you don't detect a scent akin to burning hair. Look at a light bulb filament and you'll see some heat radiation.
For cutting grass you'll want a laser frequency which isn't reflected well. Plants look fairly white in the IR bands, so maybe a blue laser would work better.
Ideally you'd want to surround your yard with mirrors. This would "recycle" the beam if it should happen to miss a grass blade on the outward trip. It would also keep birds, pets, and small children from developing char marks.
On the other hand, maybe a water-jet cutter would work better. Nikola Tesla clamed that his device was effective over huge distances. It used electrically-accelerated mercury droplets.
07-01-2003, 11:36 PM
You could use a multiple ir-laser approach to build a grass incinerating system. Make each individual beam too weak to do more than lightly warm a blade of grass, and build an elaborate guidance system to converge a couple dozen beams at a precise, variable point in space. With proper guidance software, you could trim your lawn one blade at a time. Building such a system would be enormously expensive.
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