![]() ![]() Results for J1 and J2 filters are presented. Coating and process development demonstrated performance on test samples followed by production of filters for J1 and J2. Total transmission and scatter measurements at a wavelength within the pass band can successfully characterize filter performance prior to dicing and assembling filters into butcher block assemblies. This paper presents results of characterization, specification, and coating process improvements that enabled production of filters with significantly reduced out of band light for Joint Polar Satellite System (JPSS) J1 and subsequent sensors. Out-of-band optical cross-talk results in spectral and spatial ‘impurities’ in the signal and consequent errors in the calculated environmental parameters such as ocean color that rely on combinations of signals from more than one band. Optical cross-talk is in-band or out-of-band light incident on an adjacent filter or adjacent region of the same filter reaching the detector. Out-of-band signal and out-of-band optical cross-talk was observed for bands in the 0.4 to 1 μm range in testing of VIIRS for S-NPP. Interference filters assembled in ‘butcher-block’ arrays mounted adjacent to focal plane arrays provide spectral definition. VIIRS collects radiometric and imagery data of the Earth’s atmosphere, oceans, and land surfaces in 22 spectral bands spanning the visible and infrared spectrum from 0.4 to 12.5 μm. The Visible/Infrared Imaging Radiometer Suite (VIIRS) is a key sensor on Suomi National Polar-orbiting Partnership (S-NPP) satellite launched on Octointo a polar orbit of 824 km nominal altitude and the JPSS sensors currently being built and integrated.
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