Patent ID: 7436518

Claim:
A Fourier transform spectrometer (“FTS”) system comprising: a Fizeau FTS having a plurality of sub-collecting elements, adjacent ones of the plurality of sub-collecting elements separated by a gap distance, at least one of the plurality of sub-collecting elements having an adjustable optical path; a Michelson FTS with a collecting element having an adjustable optical path; and one or more processors configured to perform the steps of: selecting spectral data collected by the Fizeau FTS corresponding to a first plurality of spatial frequencies for which the Fizeau FTS has a modulation transfer function value above a first threshold level; selecting spectral data collected by the Michelson FTS corresponding to a second plurality of spatial frequencies for which the Michelson FTS has a modulation transfer function value above a second threshold level; and combining the selected spectral data collected by the Fizeau FTS with the selected spectral data collected by the Michelson FTS.