METHOD AND APPARATUSES FOR FOURIER TRANSFORM SPECTROMETRY

Disclosed is a Fourier-transform spectrometer comprising a beamsplitting arrangement operable to define a first radiation source and a second radiation source from a common radiation source, and at least one detector operable to detect interferogram data as a function of detection position in at least a first detection plane direction of a detection plane, the interferogram data resulting from interference of a first diverging beam emitted from said first radiation source and a second diverging beam emitted from said second radiation source. A processor is operable to:perform a linearization correction to said interferogram data to obtain linearized interferogram data; and Fourier transform the linearized interferogram data to obtain spectral characteristic data relating to the common radiation source.