Design of onboard calibration unit of space-borne imaging spectrometer

Ming Li; Shitao Ding; Dazhou Xiao

doi:10.1117/12.2070402

18 November 2014 Design of onboard calibration unit of space-borne imaging spectrometer

Ming Li, Shitao Ding, Dazhou Xiao

Proceedings Volume 9298, International Symposium on Optoelectronic Technology and Application 2014: Imaging Spectroscopy; and Telescopes and Large Optics; 92980A (2014) https://doi.org/10.1117/12.2070402
Event: International Symposium on Optoelectronic Technology and Application 2014, 2014, Beijing, China

Abstract

The onboard calibration unit is an important part of the space-borne imaging spectrometer and used for the onboard radiometric calibration and spectral calibration of the spectrometer. An imaging spectrometer used in marine satellite is given as an example and its onboard calibration unit is introduced. The onboard calibration unit is in the front of the optical path of the spectrometer, with the sun as the light source, the space qualified PTFE diffusers are used for the onboard radiometric calibration, and the space qualified PTFE diffuser doped with rare earth elements is used for the onboard spectral calibration. The components of the calibration unit are introduced. For the main radiometric calibration diffuser and the redundant radiometric calibration diffuser, the BDRF test results in component level are introduced. Considering the effects of the assembly error and the stray light after the assembly of the spectrometer, the BDRF test method of the radiometric calibration diffuser in system level is introduced. The test results of the directional hemispherical reflectance of the radiometric calibration diffusers and the spectral calibration diffuser are given and the wavelengths of the absorption peaks of the spectral calibration diffuser are obtained. According to the measurement signal of the spectrometer while the onboard spectral calibration, the wavelengths of the absorption peaks of the spectral calibration diffuser which can be used for the onboard spectral calibration are determined. The onboard calibration unit can satisfy the onboard calibration requirements of the spectrometer.

Citation Download Citation

Ming Li, Shitao Ding, and Dazhou Xiao "Design of onboard calibration unit of space-borne imaging spectrometer", Proc. SPIE 9298, International Symposium on Optoelectronic Technology and Application 2014: Imaging Spectroscopy; and Telescopes and Large Optics, 92980A (18 November 2014); https://doi.org/10.1117/12.2070402

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KEYWORDS

Diffusers

Calibration

Spectral calibration

Spectroscopy

Bidirectional reflectance transmission function

Sun

Absorption

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