Method for calibrating interpixel gains of an interferometer
AssigneeCentre National D'Etudes Spatiales
InventorsElodie Cansot, Alain Rosak
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Abstract
A method is provided to calibrate a detection array used for acquiring an image of an interferogram at an instrument. A first interferogram and at least two shifted interferograms are elaborated at the instrument by creating a number of optical path differences, so at least three samples are on a sine wave portion for each optical path difference. A function coinciding with the sine wave portion is determined by interpolation. A calibration coefficient is determined from the function for each optical path difference.
Claims12
A method for calibrating a detection array used for acquiring an image of an interferogram at an instrument, where the instrument having an input spectrum, comprising the steps according to which:
- elaborating a first interferogram by creating a finite number of optical path differences, and elaborating at least two shifted interferograms by shifting each of the optical path differences of the first interferogram, where each optical path difference having at least three samples positioned on a sine wave portion;
- determining, for each sine wave portion, a function coinciding with the sine wave portion by interpolation;
- determining a calibration coefficient for each optical path difference from the function coinciding with the sine wave portion corresponding to this optical path difference.
Dependencies are inferred from the claim text.