Subject:
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Re: General IR question
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 14 May 2002 01:13:06 GMT
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Viewed:
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718 times
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Typical remote control IRs like the RCX system are usually in the 870 - 950
nm range, just below visible red.
A standard silicon CMOS camera chip will "see" this fine unless it has an IR
cut filter (commonly installed in camcorders etc). Silicon is actually very
efficient in this range, compared to its efficiency in the visible part of
the spectrum.
Other techniques are used in "IR cameras". There are two general classes of
these, 3 - 5 um and 8 - 15 um. 3 - 5 is typical of the heat seeking missile
type sensor (looking for jet exhausts etc) and 8 - 15 finds people and heat
escaping through house windows.
You won't see much from a remote control LED on either of 3 - 5 or 8 - 15.
Hope that helps.
JB
In lugnet.robotics, dan@flashfilmworks.com writes:
> In general, what's the difference between the IR "signal" that the
> tower and RCX use to communicate and the IR energy used in thermal
> imaging? Is it just a matter of frequency? If the RCX was pointed at
> an IR camera, what what would it see?
>
> --
> Dan Novy
> Visual Effects Technical Supervisor
> Flash Film Works
> dan@flashfilmworks.com
>
> /////////////////////////////////////
>
> Windows Free by 2003!!!!!
>
> /////////////////////////////////////
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Message is in Reply To:
 | | General IR question
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| In general, what's the difference between the IR "signal" that the tower and RCX use to communicate and the IR energy used in thermal imaging? Is it just a matter of frequency? If the RCX was pointed at an IR camera, what what would it see? -- Dan (...) (23 years ago, 13-May-02, to lugnet.robotics)
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