Re: Inexpensive infrared edge/cutoff filters

[Clive Warren <Clive.Warren@xxxxxxxxxxxxx>]

>> Can anyone think of an inexpensive way to flood a small room with
>> 2 bands of IR?
>
>> What I would then do is put a filter over two cameras so each camera
>> sees a different band.
>
>Could you explain more clearly? Why not just flood the room with broad band IR
>and then selectively pick out the two areas of interest to you using "notch"
>filters? Or, alternately, why not flood the room with IR emitted by two
>different kinds of IR "LEDs"  (or IRLED's!). These have fairly narrow emission
>bands and are available for several IR wavelengths.
>
>andy
>
>Andrew  o o  0 0 o . o  Davidhazy, Imaging and Photo Tech


Yep, that was going to be my suggestion - just by chance was looking at the
characteristics of two different types of IR LED emitters this morning.
Those centred around 850nm are fairly inexpensive - those centred around
1000nm are are bit more pricey.


All the best,

             Clive   http://www.cocam.co.uk
                     Photographic Services, Filters and Equipment, Infrared FAQ
                            http://clive.bel-epa.com
                            Adventures in Cyberspace - Digital Art and Photos


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