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Article #15083Re: police laser radar
From: Mike Tarrant
Date: Fri, 20 Nov 1992 16:39
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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<By0wyC.EM6@snuffy.wa.atk.com>Path:
arc1-ca.pugleaf.net!sparky!uunet!cis.ohio-state.edu!zaphod.mps.ohio-state.edu!darwin.sura.net!wupost!micro-heart-of-gold.mit.edu!uw-beaver!uw-coco!nwnexus!snuffy!mtarrantReferences:
<Nov16.225043.36767@yuma.ACNS.ColoState.EDU> <1992Nov18.132406.11359@news.yale.edu> <Bxx74o.2vo@immd4.informatik.uni-erlangen.de>Show Full Headers
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Newsgroups: sci.electronics Path: arc1-ca.pugleaf.net!sparky!uunet!cis.ohio-state.edu!zaphod.mps.ohio-state.edu!darwin.sura.net!wupost!micro-heart-of-gold.mit.edu!uw-beaver!uw-coco!nwnexus!snuffy!mtarrant 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 Lines: 19