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The World Of Full Spectrum

Started Sep 16, 2017 | Discussions thread
ProfHankD
ProfHankD Veteran Member • Posts: 9,147
Re: The World Of Full Spectrum

Enginel wrote:

petrochemist wrote:

NIR to ~1000nm is fairly easy to do but the UV side is much more awkward, even if limiting your studies to 300nm+

I think one would rather make a fluorescent DOF adapter, than fiddling with the camera sensor. (there even exists a fluorescent thing which converts 1.5 micron to about 1.0 micron!! Called anti-stockes phospor IIRC)

Anti-Stokes phosphors are great stuff for NIR, and can bring communication NIR LEDs into the range where you'd be able to get a CMOS sensor to see them. The catch is that the phosphors require a double lens system (lens projects onto phosphor, lens images phosphor onto sensor) and absorb multiple photons to emit each photon, so they're dim. Add to that the fact that the NIR-blocking filter on a normal sensor takes you down another 7 stops or so and you've got a problem -- which is why removing the NIR blocking filter from in front of the sensor is so popular.

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