IR absorption
Robert Schwartz
Posts: 141
Hey guys. I know that black matte surfaces absorb IR the best, but are there any other things that will affect how much a surface absorbs/reflects IR?
Comments
If you have 'rough' surfaces coming in between your beam then having a larger dot will make it more likely you'll have enough light reflect back to your detector.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
·
Steve
http://members.rogers.com/steve.brady
"Inside each and every one of us is our one, true authentic swing. Something we was born with. Something that's ours and ours alone. Something that can't be learned... something that's got to be remembered."
So, if you wanted to make it IR invisible....then you wouldn't be able to find it! haha
The best you can do is do the B2 stealth bomber thing and make all the angles sharp.
There was a russian scientist that did all his math stuff and determined that a triangle is the best geometric shape that would be least visible to radar.
Garbage trucks have a larger profile than a honda civic and not just because of the shear size....the truck has a flat profile that directs the pulse straight back, where the civic has a low profile and not as much signal is reflected.
Can you Jam him?· Jamming him would jam yourself, if you use a similar sensor.
If you've ever seen the side of a mountain that was avalanche prone...they put up large snow fences (but permanent).· These are kind of like baffles...they disrupt the force of the wave coming down the mountain.
So, if you look on the exhaust ports of the B2, you'll see similar baffles...they let radar beams in but not out.
BUT...having said all that....for you, it's not that the material is wood or metal, it's if it'll reflect light.
Flat black is a good start.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
·
Steve
http://members.rogers.com/steve.brady
"Inside each and every one of us is our one, true authentic swing. Something we was born with. Something that's ours and ours alone. Something that can't be learned... something that's got to be remembered."
Just make your robot out of one huge silicon crystal: http://acept.la.asu.edu/PiN/rdg/irnuv/irnuv.shtml·
if you want to be scientific about it you can get an ir photography filter, bunch of paints, thin card stock and a thermometer. Paint the stock, place lens, thermometer, card stock in the sun for a period of time, take the measurement, repeat each day at the same time for each paint. The one that results in the highest temperature absorbs the most IR.
If you dont want to go through the trouble, get flat black and mix in some graphite.
Or cover your surfaces with mirrors if no panel is likely to be perpendicular to your opponent (slightly leaning them inward towards the top will accomplish this). The IR beam when reflected will be too high for the sensor to pick up. The more slanted the angle the smaller the "visibility" radius arround your robot will be.
One thing you might want to consider is putting a "mirrored cone" around your robot (minus the top), kind of like a moon crater in shape. When another robot tries to sense yours with IR, the IR will be reflected up away from the sensor, and not back. The stealth uses similar technology by having flat, diamond-like surfaces (most of the radar is reflected away from the source at odd angles, not back), unlike a typical aircraft which has rounded surfaces that have portions that are always aimed directly at the radar source.
Hope that helps,
Dave
Remember when Voltron lost their shield abilities and then they went to site specific shields...where operators would turn on a small area that would deflect the·damage in that spot.· HAHA....sorry, was reaching there!
If you're bot is a big wedge....then having a 'mirror-like' surface should be good enough to give you a low reflective profile.· paint your bot with your black paint....give it 3 or 4 good coats...then wet sand it with some fine grit sand paper.· This is what car painters do to give it that mirror look...it's not just a 'clear-coat'; otherwise you get an orange peel texture look.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
·
Steve
http://members.rogers.com/steve.brady
"Inside each and every one of us is our one, true authentic swing. Something we was born with. Something that's ours and ours alone. Something that can't be learned... something that's got to be remembered."
bugg
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
I think I know what I'm doing...
...Maybe...
Post Edited (bugg) : 2/18/2005 4:25:17 PM GMT
But basically you would send out a decoy to fool the other bot.· Of course, you would have this offset to your own detector so that it wouldn't pick it up.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
·
Steve
http://members.rogers.com/steve.brady
"Inside each and every one of us is our one, true authentic swing. Something we was born with. Something that's ours and ours alone. Something that can't be learned... something that's got to be remembered."
Post Edited (Paul Baker) : 2/18/2005 9:47:24 PM GMT