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From: BHB3@PSUVM.BITNET
Newsgroups: rec.autos,sci.electronics,misc.consumers
Subject: Re: the laser speed measuring device
Message-ID: <89331.143759BHB3@PSUVM.BITNET>
Date: 27 Nov 89 19:37:59 GMT
References: <89325.164006BHB3@PSUVM.BITNET> <807@uc.msc.umn.edu>
Organization: Penn State University
Lines: 14

The critical facts needed are the output power and the frequency of the
device.  The reflectance off of a car surface is going to be pretty week, so
the thing has to have a quite sensitive detector for that frequency.  It is
probably possible to overwhelm the detector with light of the same frequency.
IR light is of couse invisible to the human eye, so even if you had a bright
IR strobe, it would be too obvious.  It is going to be extremely obvious
to the cop that you are jamming it with high intensity light, since the
device is scope aimed(i.e. He knows who you are right away).  An effective
jammer is going to have to cause it to register the correct speed.  Since the
device works on succesive distance measurements, you would have to know the
pulse rate it puts out.  I would say a police scanner would be the best real
countermeasure.

                                              Brent H. Besler


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