Subject:
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Re: detecting goal objects at a distance
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 1 Jan 2000 10:05:37 GMT
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Viewed:
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1452 times
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Ben Jackson wrote:
>
> You can get these (as well as so-called Hot Mirror filters to block IR) at any
> camera store.
>
> --Ben
Well, I knew that camera stores sell IR blocking filters but IR transmission
filters? Are you sure? (What would be the purpose for normal photography?)
Uwe
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Message has 1 Reply:
 | | Re: detecting goal objects at a distance
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| (...) IR Photography, of course. Lookup Kodak HIE, for example. The filters you are looking for are Wratten #87 and 87C. If you look at them they appear to be black because they pass no visible light. I believe the difference between the two is (...) (25 years ago, 1-Jan-00, to lugnet.robotics)
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Message is in Reply To:
| | Re: detecting goal objects at a distance
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| (...) Well, I do now! I bought three last night. I got a GaAs IR LED that was clearly made for a remote control application. The good news is that when it is pointed at the LEGO light sensor it pegs at 100%! Unfortunately it's higly directional (it (...) (25 years ago, 31-Dec-99, to lugnet.robotics)
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