The invention provides a spectrometer setup comprising a light receiving section, a light dispersive element, and a 2D array light detector, wherein the spectrometer setup further comprises a polarization analyzer configured downstream of the light receiving section and upstream of the light dispersive element, wherein the spectrometer setup is configured to allow part of the received light as measuring beam to be intercepted by the polarization analyzer and to allow part of the received light as reference beam to be non-intercepted by the polarization analyzer, wherein the polarization analyzer is configured to modulate a spectral light distribution of only the measuring beam, wherein the spectrometer setup is configured to disperse by the light dispersive element both (i) at least part of the measuring beam downstream of the polarization analyzer and (ii); at least part of the reference beam, and to display at different parts of the 2D array light detector.
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