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Re: quattro-digest V3 #1010

On Tue, 10 Sep 1996, Igor Kessel wrote:

> (aka "lasers") speaking. The laser beam is highly focused and coherent, which 
> means it does not scatter. At a distance of 1 km it may very well yield a spot 
> of a few cm in dia. So, virtually no chance of getting a stray signal bounced 
> off some letargic Roadmaster fearlessly doing 67 in a 65 mile zone in the fast 
> lane in front of you.

Donning Nomex here, but Helmet is only Snell85

I have to disagree with a lot of this Igor...I studied lasers a lot as 
well as working at Litton Laser w/ laser radar (military side).  They 
dont use high quality YAG's on these things, but the diffusion rate is 
high, a lot of speckle. Laser detectors dont require a direct hit to be 

> Also the light travels at 300000km/sec. What is your best reaction time?

About the same as radar...whats the difference?

> your car is black,
> your headlights are completely taped black,
> your windshield is completely taped black and 
> you don't have a front plate 

Thats like saying you can avoid radar if you rid your car of all metal, 
everything radar reflective, and use anti radar paint.



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