Landsat 9 Thermal Infrared Sensor 2 Preliminary Stray Light Assessment

Montanar, Matthew ; McCorkel, Joel ; Tveekrem, June ; Stauder, John ; Lunsford, Allen ; Mentzell, Eric ; Hair, Jason ; Reuter, Dennis

关键词: INFRARED DETECTORS;    THERMAL LENSING;    LANDSAT SATELLITES;    CHARACTERIZATION;    OPTICAL EQUIPMENT;    PRELAUNCH SUMMARIES;    SCATTERING;    ILLUMINATING;   

RP-ID  :  GSFC-E-DAA-TN65767-1

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Although the Thermal Infrared Sensor 2 (TIRS-2) is a nearidentical copy of the Landsat 8/TIRS-1 instrument, an important design change to the optical system was designed to mitigate the stray light issue that plagued the TIRS-1 instrument [1, 2, 3]. This change involved the addition of several baffles strategically placed within the optical telescope to block the stray light paths that were present in the TIRS- 1 design. The specific optical changes were determined by first characterizing the TIRS-1 stray light paths on-orbit and then deriving a detailed optical model that was used to determine the locations and shapes of the mitigating baffles. The stray light design changes to the TIRS-2 instrument were confirmed through the initial thermal-vacuum characterization tests. Preliminary assessments of TIRS-2 indicate that the total stray light magnitude has been drastically reduced to a total magnitude of approximately 1% or less.