Out of band scatter measurements from OLI optical bandpass filters

P. D. Fuqua; C. J. Panetta; J. D. Barrie; E. Waluschka; T. A. Mooney

doi:10.1117/12.945964

15 October 2012 Out of band scatter measurements from OLI optical bandpass filters

P. D. Fuqua, C. J. Panetta, J. D. Barrie, E. Waluschka, T. A. Mooney

Proceedings Volume 8510, Earth Observing Systems XVII; 851009 (2012) https://doi.org/10.1117/12.945964
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

Multi-spectral Earth imaging sensors commonly use edge-bonded filter arrays (also known as “butcher blocks”) for spectral selection. These arrays are built from small filter “sticks” that are diced from coated wafers and then bonded together and placed in very close proximity to the detector array. Some filter designs are susceptible to excessive high angle scatter if the filters are constructed under less than ideal deposition conditions. This scatter can lead to optical crosstalk, which degrades system performance. Insufficient specifications and sub-optimum manufacturing practices lead to a phenomenon called angle resolved scatter (ARS), where light that should have been rejected by the filter is scattered into a very high-angle leak path, leading to optical crosstalk. The Landsat Data Continuity Mission’s (LDCM’s) operational land imager (OLI) instrument uses proximal filter arrays for spectral selection, so it is important to quantify the amount of transmitted, scattered light in wavelength ranges outside the pass band. This paper describes the scatter measurement techniques and Bi-Directional Transmission Distribution Function (BTDF) results for 3 OLI filters.

Citation Download Citation

P. D. Fuqua, C. J. Panetta, J. D. Barrie, E. Waluschka, and T. A. Mooney "Out of band scatter measurements from OLI optical bandpass filters", Proc. SPIE 8510, Earth Observing Systems XVII, 851009 (15 October 2012); https://doi.org/10.1117/12.945964

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