Correct exposure times for recording spectral lines
Physikfan, Tue Feb 06 2018, 11:20AM
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.
Re: Correct exposure times for recording spectral lines
2Spoons, Wed Feb 07 2018, 01:25AM
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.
Re: Correct exposure times for recording spectral lines
Physikfan, Wed Feb 07 2018, 11:55AM
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.
Regards
Physikfan