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Linear Variable Filters (LVF) bandpass filters provide a gradient in passband wavelength along one axis and constant center wavelength along the orthogonal axis. Infrared LVF filters used to discriminate wavelength provide a hyperspectral capability to the infrared imager which is light weight and rugged. By exploiting filter harmonics, dual band LVF filters have been demonstrated for the mid and far infrared spectral regions.
Thomas D. Rahmlow Jr.,Terrance L. Finnell Jr.,Timothy Olsen, andRobert L. Johnson
"Single and dual band linear variable filters (LVF) for the mid and far infrared", Proc. SPIE PC12103, Advanced Optics for Imaging Applications: UV through LWIR VII, PC1210304 (13 June 2022); https://doi.org/10.1117/12.2618975
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Thomas D. Rahmlow Jr., Terrance L. Finnell Jr., Timothy Olsen, Robert L. Johnson, "Single and dual band linear variable filters (LVF) for the mid and far infrared," Proc. SPIE PC12103, Advanced Optics for Imaging Applications: UV through LWIR VII, PC1210304 (13 June 2022); https://doi.org/10.1117/12.2618975