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Article #15083

Re: police laser radar

#15083
From: Mike Tarrant
Date: Fri, 20 Nov 1992 16:39
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In article <Bxx74o.2vo@immd4.informatik.uni-erlangen.de> orscholz@immd4.informatik.uni-erlangen.de (Oliver Scholz (Turo - Backstage)) writes:
>Ken Wilkens <wilkens%nmr@venus.ycc.yale.edu> writes:
>
>>Well I was thinking about putting laser diodes on the front of my car
>>also soon as I found what wavelength the operate at. I don't think it
>>would take much power to foul the lidar as it uses reflected power which
>>should be alot less than you would be broadcasting. As for the legal
>Exactly. That's why you don't need lasers. Remember, if you use a laser, you
>have to aim directly at the speed gun to jam it effectively. Why not use
>IR-LEDs? Their light is much more diffuse, and as you stated, the LEDs
>should be much 'brighter' than the reflection from your car.
>
That probably wouldn't be effective.  I'm pretty sure the laser is
going to be modulated to allow the receiver to discriminate between
the actual reflection, and noise in the environment.  You'd have to
modulate your LED array at the same frequency.  Things get more
complicated if the frequency changes (i.e. a chirp).
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References: <Nov16.225043.36767@yuma.ACNS.ColoState.EDU> <1992Nov18.132406.11359@news.yale.edu> <Bxx74o.2vo@immd4.informatik.uni-erlangen.de>

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From: mtarrant@snuffy.wa.atk.com (Mike Tarrant)
Subject: Re: police laser radar
Message-ID: <By0wyC.EM6@snuffy.wa.atk.com>
Organization: Alliant TechSystems Inc.
References: <Nov16.225043.36767@yuma.ACNS.ColoState.EDU> <1992Nov18.132406.11359@news.yale.edu> <Bxx74o.2vo@immd4.informatik.uni-erlangen.de>
Date: Fri, 20 Nov 1992 16:39:47 GMT
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