SPECTROMETRY SYSTEM AND METHOD FOR DETERMINING A STRAY-LIGHT INDUCED INTENSITY OFFSET IN A SPECTRUM

摘要

The present invention relates to a spectrometry system adapted for determining astray-light induced intensity offset (205) in a spectrum. The spectrometry system comprising: a spectrometer (110) having an entrance slit arranged to receive light from a light source (150) emitting light carrying spectral information, a dispersive material arranged to disperse light entering the spectrometer (110), and an output wherein the dispersed light exits the spectrometer (110) as a spectrum, the spectrum comprising signal photons being photons travelling along an intended optical path within the spectrometer (110) and carrying spectral information pertaining to the light emitted from the light source (150) and stray-light photons being photons not travelling along the intended optical path within the spectrometer (110) and not contributing to the spectral information pertaining to the light emitted from the light source (150); and a front pattern (120) mounted between said light source (150) and said output of the spectrometer (110), wherein said front pattern (120) is arranged to partially block and partially transmit light emitted from said light source (150) giving said light from said light source (150) a predefined imprint when passing through said front pattern (120) such that the spectrum is spatially modulated comprising at least one brighter region (202) containing both signal photons and stray-light photons and at least one darker region (204) containing only stray-light photons.