Today a proof that reflected UV photography is doable at UV-B using a special, up to NIR blocked, peak 313nm, FWHM 9nm narrowband filter and my special UV camera. Lens used was my UV-Nikkor 105mm quartz flourite lens. All shots were done at f4.5.
[click on image to see a larger one]
313nm FWHM 9nm Filter transmission spectra:
Reflected UV-B image at 313nm, 0.8 sec exposure:
This was just a proof of concept that reflected UV imaging can be successfully done even at such deep UV-B wavelengths (OH* 313nm) showing the stainless steel combustion emission valves of a central heating system.
In case you were wondering how a flame of a gas torch would look like in UV...
Triptych (top to bottom) Visual light, emitted UV (320-390nm, Baader-U), emitted UV-B (313nm):
Triptych (top to bottom) Visual light, emitted UV (320-390nm, Baader-U), emitted UV-B (313nm) - morph. Gradient:
Diptych (black/white, top to bottom) emitted UV (320-390nm, Baader-U) vs emitted UV-B (313nm):
This reveals, that the broadband UV image shows a much broader, but less detailed gas flame, the 313nm image however, 313nm being the emission peak wavelength of the OH radical, shows a much more detailed flame image and is useful to judge how efficient the gas combustion process is.
Stay tuned, more will follow on that fascinating subject...
Tuesday, August 4, 2015
Deep UV Ultraviolet Reflected Light Photography at UV-B 313nm
Gepostet von Dr Klaus Schmitt unter 2:39 PM
Labels: 313nm, combustion, deep UV, OH, OH* radical, reflected UV, UV-B, UV-Nikkor 105mm