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I had a similar idea, but I was picturing a funnel-shaped mirror above a light sensor so that no matter what angle you hit it at the light is reflected down at the sensor. -----Original Message----- From: Ian Warfield [mailto:ipw47@hotmail.com] (...) (24 years ago, 8-Aug-00, to lugnet.robotics)
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| | Re: Autonomous Robot
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(...) Yes - but that wouldn't be a funnel shape - it would need to be a 'retro-reflector' that reflects all light back to it's source - no matter the direction. That's why I was babbling on about the retroreflective tape they have on kids clothes (...) (24 years ago, 9-Aug-00, to lugnet.robotics)
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| | Re: Autonomous Robot
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How exactly do the retroreflectors work? I was under the impression that you couldn't selectively reflect light unless you had a parabolic dish - and then it would all focus on one point. Do your reflectors have a convex mirror, or some other (...) (24 years ago, 9-Aug-00, to lugnet.robotics)
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| | Re: Autonomous Robot
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(...) you (...) then (...) or (...) No, there are no convex mirror, just triangular prisms, like small pyramids. Their angles are designed to reflect the light back to the direction it came from (thru' two reflections). I can provide an example in (...) (24 years ago, 9-Aug-00, to lugnet.robotics)
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| | Re: Autonomous Robot
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in article Fz036w.F10@lugnet.com, Ian Warfield at ipw47@hotmail.com wrote on 8/8/00 6:08 PM: (...) Here's a picture of a marine radar reflector. (URL) back of a bicycle reflector is a hexagonal array of little triangular right-angle pyramids packed (...) (24 years ago, 9-Aug-00, to lugnet.robotics)
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| | Re: Autonomous Robot
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(...) But they seem (in practice) to splatter reflections in all sorts of weird directions (as well as the direction you want). That might not matter in some applications. The corner reflector ought not to suffer from *that* problem - but it looks (...) (24 years ago, 10-Aug-00, to lugnet.robotics)
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