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 03:01:12 GMT
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Original-From:
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Steve Baker <sjbaker1@airmail.^ihatespam^net>
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Reply-To:
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sjbaker1@AVOIDSPAMairmail.net
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Viewed:
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856 times
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Dan Novy wrote:
> 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?
IR sensors (of the type used by the military for night operations for example)
operate over some fixed range of IR frequencies - some work in the near IR
(or perhaps even somewhat into the Red end of the visible spectrum) - others
in the far infra-red where temperature is easier to sense.
I'm not sure what frequency the RCX generates - but I'm told that it's
visible even in most domestic camcorders - so it's probably in the near
IR range. That's not really in the "thermal" range (although that's a
vague term) - it's really light that's just a tiny bit too Red for your
eyes to pick up.
I've not checked the RCX - but I did try looking at the IRDA port of my
palmtop in a friend's camcorder - and it was visible as a fairly bright
dot when the room lights were dimmed just right.
----------------------------- Steve Baker -------------------------------
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Message has 1 Reply:
 | | Re: General IR question
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| Someone has a site with a video of a robot they made. In the video, you can see the two IR LED's blink. The site owner made a comment about what the blinking was caused from. Unfortunately, I don't remember the site address... I think the site had (...) (23 years ago, 14-May-02, to lugnet.robotics)
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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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