Radar Scrambling

[Walters Chris]

>> Has anyone figured out what kind of plastic the sheet is that goes
>> in front of your license plate to attenuate the laser reflection?
>> And a (cheap) source?
>
>It's called a tarp, and you can get them at Home Depot.  :-)
>
>You're looking for a material that disperses/absorbs infrared, yet
>doesn't obstruct visible light?  Sounds like the kind of thing you'd
>find in a JC Whitney catalog.

Not at all. Edmund's Scientific catalog lists plenty of glass and plastic 
sheets with various coatings to reflect/absorb light in just about every 
part of the spectrum you could want.
To defeat laser you can 1)disperse it,  2) absorb it,  or  3) change the 
frequency of the reflected beam so it's no longer "visible" to the laser 
receiver/detector diode.

The reason to put this stuff over the license plate is to make sure the 
laser gets a good reflection -- as cars get more aerodynamic they get 
stealthier, fewer flat panels normal to the road. A laser would have no 
problem getting a reflection from the front of my 74 LTD

To defeat photo-radar you need a different kind of plastic, one with a high 
refractive index. Typically three sheets are laminated together with the 
resulting index being so high that you can only see the license from 
straight on/behind. Photo radar cameras have to be mounted at some offset so 
now they can't see your plate.


Snake (Mr. Electronic Counter Measures)
TWO pretty cool Fords, one very cool Dodge