Spectral calibration of the space-borne infrared imaging Fourier transform spectrometer

Liu, Peng; Wang, Zhanhu; Peigang, Wang; Hua, Jianwen

doi:10.1117/12.835035

Cited by 2 publications

(1 citation statement)

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“…The ILS represents the contribution of instrumental finite resolution and all other contributors such as instrument misalignments and shear [7]. In other words, the ILS can be thought of as the response of the monochromatic light to the instrument and is affected by such things as the truncation, finite field of view, off-axis, and diffraction effects of the Fourier transform spectrometer [30,31].…”

Section: The Off-axis Effects Of the Flat Array Detectormentioning

confidence: 99%

Intensity Simulation of a Fourier Transform Infrared Spectrometer

et al. 2020

Sensors

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This paper introduces an intensity simulation for the Fourier transform infrared spectrometer whose core element is the Michelson interferometer to provide support for the on-orbit monitoring of the instrument and to improve the data processing and application of the Fourier transform spectrometer. The Geostationary Interferometric Infrared Imager (GIIRS) aboard on Fengyun-4B (FY-4B) satellite, which will be launched in 2020, aims to provide hyperspectral infrared observations. An intensity simulation of the Michelson interferometer based on the GIIRS’s instrument parameters is systematically analyzed in this paper. Off-axis effects and non-linearity response are two important factors to be considered in this simulation. Off-axis effects mainly cause the wavenumber shift to induce a large brightness temperature error compared with the input spectrum, and the non-linearity response reduces the energy received by the detector. Then, off-axis effects and a non-linearity response are added to the input spectrum successively to obtain the final spectrum. Off-axis correction and non-linearity correction are also developed to give a full simulation process. Comparing the corrected spectrum with the input spectrum, we can see that the brightness temperature errors have a magnitude of 10−3 K, and this fully proves the reliability and rationality of the whole simulation process.

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Section: The Off-axis Effects Of the Flat Array Detectormentioning

confidence: 99%