Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!umich!wsu-cs!egrunix!besler
From: besler@egrunix.UUCP (Brent Besler)
Newsgroups: sci.electronics
Subject: Re: Bad News- Lasers replace Radar guns
Message-ID: <353@egrunix.UUCP>
Date: 18 Jan 90 18:07:54 GMT
References: <7263@lindy.Stanford.EDU> <349@egrunix.UUCP> <4236@rsmas.miami.edu>
Reply-To: besler@unix.secs.oakland.edu.UUCP (Brent Besler)
Distribution: na,global
Organization: Oakland University, Rochester, MI
Lines: 23

>I thought that the units were tied into the car spedometer to adjust for police
>car speed.  Shouldn't that work?

In general the speedometer in the cop car may be off a couple of MPH, and that
can make big a big difference with regard to fines, etc.  Radar gun aren't 
wired into a cops speedometer.  They use a separate radar beam to determine
the speed of the cop car relative to the ground.
>
>Besides, with the narrow angle, more precise aim would indicate that stationary
>use would be better anyway.

Yes, but it would be conveient to have moving use capability.

>Now, since it's optical, it should be possible to use irregular matte finishes
>and honeycomb materials to inhibit proper returns.  The Stealth mobile lives!

A black car is going to reflect the leat light in the near IR.  I am sure
the IR detector in the device has to be very sensitive, as I am sure the
desigeners too it into account.  The only device being made yet is made by
International Measurement and Control.  The probably have a patent since there
is a very large potential market for this device.

							    Brent H. Besler