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Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
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Correct exposure times for recording spectral lines The spectra are Hg spectra, photographed from a Canon 10D, with increasing exposure times from top to bottom, (1/90 s, 1/30 s, 1/10 s, 1/2 s, 3 s), light source is a Hg high pressure lamp , the entrance slit is imaged on a screen with a quartz lens via a reflection grating, the left part consists of an ultraviolet luminescent screen to detect the UV lines:
In the last two spectra, the overexposure of the 546nm and 577nm lines is already clearly visible.
Further experiments with quartz prism are in preparation.
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The relative magnitude of the UV portion may not be correct if you are using a luminous pigment to down-convert to visible, as the quantum efficiency probably varies with wavelength.
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Hi 2Spoons
"The relative magnitude of the UV portion may not be correct if you are using a luminous pigment to down-convert to visible, as the quantum efficiency probably varies with wavelength."
I agree completely with your statement. But up to now I have only the possibility to detect UV-lines by recording pictures from a fluorescent screen. There exists an UV-Nikkor for exorbitant money but I am not sure if the the UV light through this lens could be detected accordingly by a very special Nikon camera body.
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Correct exposure times for recording spectral lines
