Xref: utzoo rec.autos:25741 sci.electronics:8789
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!mentor.cc.purdue.edu!g2i
From: g2i@mentor.cc.purdue.edu (Kyler Laird)
Newsgroups: rec.autos,sci.electronics
Subject: Re: laser speed measuring dev. more...
Message-ID: <5386@mentor.cc.purdue.edu>
Date: 28 Nov 89 00:47:15 GMT
References: <89331.173931BHB3@PSUVM.BITNET>
Reply-To: g2i@mentor.cc.purdue.edu (Kyler Laird)
Followup-To: rec.autos
Organization: Purdue University
Lines: 31

In article <89331.173931BHB3@PSUVM.BITNET> BHB3@PSUVM.BITNET writes:
>Since cars don't have IR mirrors on them, the reflected signal will
>be weak, so consequently the detection system is going to have to be pretty
>sensitive.  This should make it pretty susceptible to jamming.

>It seems doubtful that it would be used at night aimed at the
>front of the car since the headlights might jam it, plus the cop looking into
>the sight would be blinded by the headlights.  Daytime headlights probably
>will reduce the effective range and might give you time to brake when/if you
>
>                                             Brent H. Besler
>                                             Ford Motor Scientific Res. Lab

O.k. so what do we paint our cars with?  It seems that something more effective
than the ECM car bra (for radar absorption?) should be possible with laser
systems.   What about making the whole area hit light up?  I heard of a law in
CA which limits cars from using lasers to do this.  Would this foul the 
detector?

Are driving light arrays going to be good for dealing with this?  A couple
100w lights should put out some substantial IR to the front.

It sounds as though laser may be great as an undetectable technology, but it
also seems much more prone to useful jamming, etc. than radar.

I don't yet understand the theories behind laser speed detection, so much/most/
all of what I say is uneducated curiosity.

I await enlightenment...

---kyler


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