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: <365@egrunix.UUCP>
Date: 19 Jan 90 18:35:12 GMT
References: <7263@lindy.Stanford.EDU> <349@egrunix.UUCP> <4236@rsmas.miami.edu> <353@egrunix.UUCP> <4264@rsmas.miami.edu>
Reply-To: besler@unix.secs.oakland.edu.UUCP (Brent Besler)
Distribution: na,global
Organization: Oakland University, Rochester, MI
Lines: 13

I looked into the reflectance of near IR as much as I could.  I borrowed a book
on IR devices from a physics friend.  There were some charts on specular IR
reflectance.  Near IR reflectance from paint behaves very much like read light.
Red will reflect most of it and so will white paint.  Black reflects the least.
It is probably possible to build a jammer out of the same variety of IR laser, 
but the problem is knowing the right pulsing rate. If the device is built well
jamming may be pretty hard and the cop will know who jamming him much more
than with radar since the device is aimed at a specific car.   A scanner
may be much more effective at spotting a laser speed trap.  A small auxiliary
radar could be mounted on a cop car to determine its speed.  It should be 
pretty low power to avoid detection by radar detectors.  

					      Brent H. Besler