Public Lab Wiki documentation

Ultraviolet spectrometry

This is a revision from September 18, 2012 21:44. View all revisions
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This page will sum-up as much information as possible on the subject of ultraviolet or UV/visible spectrometry. It will concentrate on the task of improving the methods to collect data in the 350 - 400nm and possibly below 350nm wavelengths, cameras and gratings permitting

CMOS camera sensors

some data shows that rear- or back-illuminated CMOS sensors are sensitive down past 200nm in the ultraviolet. Presumably glass lenses will cut off anything below 350nm, so to take full advantage of this we might consider using a pinhole instead of a glass lens. Luckily webcam lenses just unscrew. Please post here if you try this!

CMOS graph

UV light tests

Recent tests have shown that 360nm and higher is possible, by calibrating a spectrometer and then pointing it at an ultraviolet light. The spectrometer was near-IR capable (had been modified). These tests were based on this work from Feb 2012 and were done with glass optics still in place.