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 21:23:41 GMT
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Viewed:
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1482 times
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In lugnet.robotics, Uwe Denzer writes:
> Ben Jackson wrote
> > You can get these (as well as so-called Hot Mirror filters to block IR)
> > at any camera store.
> 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?)
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 exactly which IR wavelengths they pass, but I don't remember the
technical details. I'm sure they're on the Kodak website.
--Ben
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