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
Keywords: radar laser police
Message-ID: <354@egrunix.UUCP>
Date: 18 Jan 90 18:17:36 GMT
References: <7263@lindy.Stanford.EDU> <13398@cit-vax.Caltech.Edu>
Reply-To: besler@unix.secs.oakland.edu.UUCP (Brent Besler)
Distribution: na
Organization: Oakland University, Rochester, MI
Lines: 14

The IM&C device is a Class I laser device, which means its use is basically un
regulated.  The power output is pretty low.  It uses rapid, very short duration
pulses.  Similar devices have been used for years to measure distances in the
military and construction. This device just computes speed from succesive
distance measurements.  Wether or not halogen bulb output will jam it is 
anybodies guess.  I am sure it has a filter to admit only the .9 micron 
wavelength.  The sophistication of the detction electronics would play a part 
in the effectuveness of jamming.  Good electronics will be able to filter out
background radiation of the .9 nm frequency.  The advantage of the jamming
light is that its intensity varies as the square of the distance whereas the
received intesnity of the meauring laser will vary as the fourth power of 
the distance.

						      Brent H. Besler