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Full spectrum photos without modified camera

Started Feb 16, 2019 | Discussions thread
petrochemist Veteran Member • Posts: 3,619
Re: Full spectrum photos without modified camera

SteveInNZ wrote:

MacM545 wrote:

The UV LED option, wouldn’t that be considered UV fluorescence?

It's fluorescence if you shine UV light on the target and it emits light at a different wavelength. You'd use a UV blocking filter on the camera and record visible light.

My suggestion is to illuminate the subject with only UV light and record the reflected light. The rational being that UV LEDs and a Woods glass filter are cheaper than an interference filter like the Baader UV.

Steve

Without a woods glass type filter on the lens, there would be a good chance of fluorescence (not all materials fluoresce so some subjects will be free of it).

It's possible to get fluorescence excited by UV & emitted in the NIR (and seen via the filters 'leakage' band) but such a large energy gap would I think be quite unusual (and not well documented as fluorescence spectrometers generally cant measure these conditions).

There are also UV only cases of fluorescence but they generally need more energetic excitation than a UV LED provides, and these probably wouldn't look that different to straight UV reflectance images anyway,

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