Spectral Shift Correction for Fabry-Perot Based Spectral Cameras

Spectral cameras with monolithically integrated thin-film interference filters are very compact and thus well-suited for use in remote sensing applications. For remote sensing applications that require lightweight optics, non-telecentric lenses are a cost-effective option. The challenge with non-telecentricity however is that interference filters are sensitive to the angle of incidence. This can cause undesired spectral shifts of the measured spectra. In this article we provide an overview of all steps required to correct spectral shifts in measured data cubes. The correction requires a one-time calibration and can then be applied in post-processing. An effective spectral shift correction will thus allow the use of compact, lightweight and fast commercial-off-the-shelf lenses without sacrificing spectral accuracy.