One of the major limitations to the use of infrared focal plane arrays (IRFPAs) in stationary Fourier transform spectrometers (FTSs) comes from the spatial inhomogeneities of the pixel responses, where the inhomogeneities of the cut-off wavenumbers of the pixels can prevail. The hypothesis commonly assumed for FTSs that all the pixels are equivalent is thus inaccurate and results in a degradation of the estimated spectrum, even far from the cut-off wavenumbers. However, if the individual spectral responses of the pixels are measured beforehand, this a priori information can be used in the inversion process to produce reliable spectra. Thus, spatial inhomogeneities are not an obstacle for the use of infrared stationary FTS. This result is illustrated in this paper by numerical simulations, based on a realistic description of an IRFPA.
© 2012 Optical Society of America
Original Manuscript: September 7, 2011
Manuscript Accepted: October 19, 2011
Published: April 4, 2012
Céline Benoît-Pasanau, Frédéric Gillard, Yann Ferrec, Sidonie Lefebvre, Sylvain Rommeluère, Nicolas Guérineau, and Jérôme Primot, "Relevance of an inverse problem approach to overcome cut-off wavenumbers disparities in infrared stationary Fourier transform spectrometers," Appl. Opt. 51, 1660-1670 (2012)