I think this would looks cool on my evo http://forums.evolutionm.net/evo-show-shine/475498-polished-hood.html
Technically you'd want as matte a finish as possible to absorb/scatter the laser. OP: I bet you love the chrome Hayabusas too, eh? :vomit:
The easiest way to jam radar/laser is to find out what freq. they pulse, then find the wavelength. Then I believe to attenuate, you'd want 1/2 wavelength bits of aluminum foil. Make yourself a little baby mobile that hangs from the rear view mirror with a bunch of them hanging from it.
Good lord that looks like a pain to keep clean. reminds me of: http://www.autoblog.com/2009/09/14/bugatti-galibier-leaks-out-after-private-unveiling-in-molsheim/
That hood is probably the chrome paint that has been buffed, and maybe sanded. The finish is definitely not aluminum. I've read that officers usually aim at your license plate when they zap you with the laser. I wonder how large the beam is though. If I didn't care what my car looked like, I would paint it in Krylon 12 min flat black. That paint seems to absorb radio signals a little bit. If you painted everything that was visible to radar (anything behind plastic or rubber) the radar cross section of a car could be reduced enough to keep radar from getting a signal until much closer.
As someone that used to work in tracking radar systems, weapons guidance, and radar/EM coutermeasures, your post is full of wrong. Flat black paint isn't going to do anything for radar. Just because they painted the stealth fighter and such flat black colors, doesn't mean it had anything to do with radar. Black paint doesn't absorb radar any more than red paint, or grey paint. The entire upper structure of a war ship is covered in 1/2" thick EM countermeasure paneling. They come in tiles. This stuff doesn't absorb enough radar to be stealth. Again, if you want to absorb electromagnetic waves, you need to "catch" them in something that will attenuate them. Radar doesn't work like a mirror, you don't need to be shiny or dull to affect it. Think about it this way. Take a red laser. Any red laser. Now, shine it on an object. Can you see the dot? If you can see the dot, it's reflecting. If you paint your car flat black, it isn't going to affect the laser's ability to detect you. Because EM radiation is still being reflected, the return beam is still "seen". To eliminate the ability for laser detection to work, you need to absorb almost all of the incoming radiation. And a couple mil layer of paint isn't going to do that for you.
Also, EM countermeasures simply affect signature or size of the target in the process. Making yourself smaller is how it works, but at <1mile, you are still going to have a signature big as ****. Even a stealth fighter at < 1mile is going to have a radar signature. It all has to do with the size of the beam, and your return signature, distance to the receive antenna, and all sorts of other factors. The best way you are going to have of blocking radar and laser is to pop chaff and hope for the best, but that's a defensive counter measure, you can't apply that in front of your car all that well. If you want to really be a super dick, and hero to everyone that travels the road ways here, you would get a couple canisters of chaff in the wavelength range of the police radar guns, and then pop them on 494 between the 35E and HWY 52. You'd have a huge radar dead zone for a very very long time.
I'm just asking questions here, but why does range matter so much if the wavelength is the same? My understanding of deflection is that the wave will bounce off or not in an applicable direction. Range is less of an issue if you diffract the wave.
If you want an explaination, you'll have to come over to the house. I can't really define the reasoning in proper english, I'd have to draw diagrams to explain it.
Evolution have aluminum hood so it not chrome paint and If you would have went to the link he says he polished the aluminum hood.
There have been some seriously mean comments left here, and perhaps we've alienated another newcomer. Perhaps we all need to look at ourselves in a mirrored hood and ask, "Why?" :laugh:
Polished hoods are big in the Miata scene as well. I say: boo. Polished aluminum looked good on the Audi Avus, (anybody else old enough to remember that?), it looks good on nothing else.
i love physics!! :woot: :+1: As far as absorbing radar goes, i'm not even sure that mexico city smog would be enough to block radar. perhaps a lightning storm or other really intense weather may mess with the electronics enough to make detecting things harder, but i doubt it. i'll let readymix weigh in on that. However if any one were dumb enough to speed in thick fog at least police would not see you, except for the shiny hood :laugh:
We have two options here.... 1) I can spend a few weeks putting together a bunch of crap to post on here to explain radar fundamentals... or 2) If Russ allows it, you can come over to his place after the moderator meeting and I can do a 4 hour presentation on the basics of radar principles. alternatively, I could put together a video and post it on t3hw00t...maybe. I hate video of myself, and I hate video blogs, and this skirts dangerously close to that line...
Ok, out of the goodness of my heart, I'm doing a very basic thing on my MNSubaru blog. You can read it there. Lesson one on basic geometry is there for now. I'll get more in depth as I find time to write about it.
I was going off the color of the hood, which doesn't strike me as aluminum. If it is, fair enough. The hue just seemed off for raw aluminum, and it seemed to have a peel. I wasn't referring to flat black paint at all. Some people painted their cars flat black with that particular product and it ruined their radio reception on an STi. That told me that it absorbing some radio waves, but I;ve done a little homework since two days ago. It seems that paint can be used to absorb radio waves, as long as it is the proper frequency. Radar seems to be in the 33-35 GHz range, so that is a bit tough to come by. But it can be done. The military apparently uses a paint with Carbonyl Iron in it, which apparently will absorb some of that frequency of radio waves. That powder can be had through the proper channels, through China. Nobody in the US sells it. Imagine that... I'm not saying anyone could make their car immune to police radar, by any means. I'm just trying to say that it is possible to reduce the RCS of a car where it might allow some more time to slow down before a signature is available. As far as the range, I just don't see how 100 yd or 10,000 yd make that much of a difference. My optics knowledge might have some holes in it, but I'm open to details. Again, I'm talking about RADAR, not laser. They are two different animals.
Distance affects the amount of pulse vectors that will make contact with the surface. Like I said, bring a 6'er over and I'll give you a nice long, booze induced run down of how radar works.
And the other problem with the radar absorbing paint theory is this, police radar isn't a sweeping array, it's a single beam, focused array. There is a single panel beam that fires out in a very narrow cone. It doesn't care about object size or signature. All it sees is "object is here...ok, now object is there...how long did it take to get from point A to point B, and what was the distance travelled...ok, now what is that number in miles per hour." Radar signature, or basically, how strong and the overall size of an object don't matter to it, it isn't trying to determine if the car is a steel buoy or a battleship. So reducing the size isn't really going to matter because any reflected signal in the PRF/wavelength of the emitted pulse is going to be picked up, the doppler analyzed and the speed deduced.
It has to be on a weekend, because I'm in Green Bay during the week. But yeah, there's so much to cover that I can't type all of it here. And the visuals require the use of the dry erase board.
I promise it wont be boring. I'll keep it relevant. Plus it's me, you know when I speak I keep it funny.
