Landsat-9, the next in the series of Landsat satellites, will have the same complement of two sensors as Landsat-8: The Operational Land Imager (OLI) that covers the reflective solar part of the spectrum in 9 spectral bands and the Thermal Infrared Sensor (TIRS) with two bands in the thermal infrared region. The main changes to the sensors for Landsat-9 will be to increase redundancy in the TIRS instrument, called TIRS-2, to bring it up to a five year design lifetime and fixes for anomalies observed on-orbit on Landsat-8 TIRS: Stray light and scene select mechanism encoder degradation. This work reports on the multi-pronged approach that will be used to ensure that stray light is reduced to required levels and properly characterized. Baffles to reduce stray light were designed and tested at several stages of sensor development. In parallel, optical modeling by NASA and independent teams was used to predict performance of the design changes to hold against test results as well as Landsat 8 TIRS on-orbit performance for model validation. A new subsystem-level test allows a large angular range to be tested to characterize out-of-field stray light that was not available during the first TIRS build. Combined, characterization results from modeling and ambient-, component-, subsystem-, and instrument-level testing will fully characterize TIRS-2 performance.
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