Re: kiddie cam

[Ray DuFlon <ray@radius.com>]

>>The IR sensitivity is a function of using silicon as an imager - its

>>response peaks in the infrared.  An IR cut filter (the blue disk that's

>>behind the lens of a PXL2000, for example) is normally added to the optical

>>path to prevent saturating the imager when outdoors, and reduce the

>>shifting of apparent brightness of objects that strongly reflect or absorb

>>IR.  Lower cost filters don't cutoff as sharply, which may be why the Kid

>>Cam is especially sensitive to this region.  Surveillance cameras that are

>>designed to work with IR illumination leave this filter out altogether.

>

>so does that mean that if you remove the blue disk on the PXL, you'd have a

>camera sensitive to IR? That would be really cool.

>

>-perry

>kinopravda productions

>(owner of one dead PXL-2000)

>

>________________________________________________

>-perry

>kinopravda productions

>www.tiac.net/users/perryp

>

>"all you need to make movies is a girl and a gun"

>

>                                -jean luc godard



If you remove the filter, a PXL or any other camera or camcorder will be

much more sensitive to near infrared.  If you then add a visible cut filter

(such as the "black" looking plastic window over the end of your TV remote

control) to knock down the visible light, an image reminicent of Kodak's

35mm IR film should be possible.  Don't confuse this with the non-silicon,

cooled cameras that "see" farther out into the IR for night vision ($big

bucks$).



Ray