Re: quattro-digest V3 #1010

[Psycho Bob <honge@creighton.edu>]

> > (aka "lasers") speaking. The laser beam is highly focused and
> > coherent, which means it does not scatter. At a distance of 1 km it

If I puff and blow a sandstorm in laser beam's path, would it "scatter" to
have laser detector detect it? It's different on theory and reality side
of these techo thingmawhatthehells.

> > 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.

> 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 
> triggered.

Exactly. But the thing is that the laser detector has to be very
sensitive. I don't think any current laser detector on the market has
sensitive enough thing to detect "laser scatter." I think most mag tests
involve direct shining of laser beam on those detectors. I don't recall
any "offset" tests to see if these bunch can detect scattered laser.

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

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

So is radar. But what do you say your probability of detecting one
yourself but yet being undetected by the enemy? In the early days, they
said radar detector is useless because once the detector goes off, you
have been clocked...

> > 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.

>From what the magazine tests said, it seems high-beams can dratically cut
down the radar speed detector's sweep range (same idea as radar jammers
-- interferance). Go to your nearst photo dealer and buy some red gel
filters (something that will pass wavelength of 650nm or whatever
offucir Bubb is using). And head out and buy some auxilary headlights (not
amber, but just plain transparent). Cover the aux headlights with the gel
filter so people won't complain about "your fog lights are on" -- at the
same time, it should kill the laser speed detector's range.

I wonder, do these laser speed detectors use real laser diode, or just
plain red LED diode?

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