Sunday, September 4, 2016

Deep UV Ultraviolet Reflected Light Photography at UV-B 313nm II

Today another proof that reflected UV photography is doable at UV-B using several special, up to NIR blocked, narrowband filters and a different than before UV camera. Lens used was my UV-Nikkor 105mm quartz flourite lens. All shots were done at f11. Light source was a gas torch flame.

[click on image to see a larger one]

Double hexaptych (top to bottom) of Visual light; emitted UV 320-390nm, 310-350nm, 290-340nm, 280-315nm, 304-322nm. Right side is morphological gradient filtering of left side:

This reveals, that the broadband UV image shows a much broader, but less detailed gas flame, the images shot with narrow(er) filters however, shows a much more detailed flame image and is useful to judge how efficient the gas combustion process is, 313nm being the emission peak wavelength of the OH radical.

I have previously written about that HERE.

Stay tuned, more will follow on that fascinating subject...