Modeling transmittance of MODIS solar diffuser stability monitor sun view screen

Tung-Chang Liu; Xiaoxiong Xiong; Xi Shao

doi:10.1117/12.2528207

9 September 2019 Modeling transmittance of MODIS solar diffuser stability monitor sun view screen

Tung-Chang Liu, Xiaoxiong Xiong, Xi Shao

Proceedings Volume 11127, Earth Observing Systems XXIV; 1112727 (2019) https://doi.org/10.1117/12.2528207
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

Earlier work by Sun et al. [2005] modeled the Sun view screen transmittance of the solar diffuser stability monitor (SDSM) on Moderate Resolution Imaging Spectroradiometer (MODIS) which explains the oscillatory pattern in the Terra/Aqua MODIS SDSM Sun view response collected during the post-launch yaw maneuvers. The SDSM screen consists of small size pinholes which limit the screen transmittance. The SDSM Sun view transmittance pattern is affected by the size and distribution of pinholes, screen thickness, and orientation between the aperture stop and the Sun view screen. Planning of post-launch yaw maneuver test often requires comprehensive angular coverage to resolve the angular variation of the screen transmittance. This paper developed a Gauss-Kronrod quadrature method-based model to simulate the SDSM Sun view transmittance. This method performs iterative integration of the interception area between pinhole and aperture stop which is critical in the screen transmittance calculation. Parametric dependences of the MODIS SDSM Sun view transmittance on various geometric factors such as the pinhole size or spacing and misalignment between the SDSM Sun view screen and aperture stop are studied. The implications for the post-launch yaw maneuver planning to resolve the angular variation of the SDSM Sun view transmittance due to the SDSM Sun view screen misalignment are discussed.

Citation Download Citation

Tung-Chang Liu, Xiaoxiong Xiong, and Xi Shao "Modeling transmittance of MODIS solar diffuser stability monitor sun view screen", Proc. SPIE 11127, Earth Observing Systems XXIV, 1112727 (9 September 2019); https://doi.org/10.1117/12.2528207

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KEYWORDS

Sun

Transmittance

MODIS

Calibration

Sensors

Computer simulations

Mirrors

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