Subject:
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Re: IR sensitivity of CCD cameras
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 25 Feb 2000 17:18:05 GMT
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Original-From:
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Robb Greathouse <rob@opengrid.(ihatespam)net>
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Viewed:
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2704 times
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I understand that is a wide variation to IR sensitivity in CCD and CMOS
cameras. Does anyone know of a list rating either sensitivity or what to
look for in the camera specifications.
Robb,
----- Original Message -----
From: John Barnes <barnes@sensors.com>
To: <lego-robotics@crynwr.com>
Sent: Thursday, February 24, 2000 6:39 AM
Subject: IR sensitivity of CCD cameras
> As has been noted, a lot of CCD cameras are very sensitive to
> IR. You can take advantage of this by building IR illuminators
> out of half a dozen or so higher power IR LEDs. I think radio
> shack sells them. String them in series, add the appropriate
> resistor for the voltage you are using for the camera and bingo,
> it sees in the dark! (Silicon's peak sensitivity is actually in
> the IR, which is why quite a lot of camera's employ an IR filter!)
>
> Now your RCX can go wheeling around in the dark, unseen by mere
> humans. Let's hope they're not groping around in the dark for
> the light switch wearing heavy boots!
>
> JB
>
>
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Message is in Reply To:
 | | IR sensitivity of CCD cameras
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| As has been noted, a lot of CCD cameras are very sensitive to IR. You can take advantage of this by building IR illuminators out of half a dozen or so higher power IR LEDs. I think radio shack sells them. String them in series, add the appropriate (...) (27 years ago, 24-Feb-00, to lugnet.robotics)
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