Design of Linear Variable Optical Filter for Hyperspectral Imaging

In this paper, the design and simulation of a Linear Variable Optical Filter (LVOF) for the visible and near-infrared (VNIR) 450-900nm region is reported. The design and simulation of LVOF are made based on all-dielectric [1–4] and metal-dielectric based induced transmission filter. In the given paper, we have compared the design approach based on all-dielectric and metal-dielectric filters. The LVOF filter based on the metal-dielectric method reduces the design and fabrication complexities and is also cost-effective as it doesn’t require any band rejection filters. The minimum spectral transmission of the metal-dielectric filter reported in the paper is 70% with a FWHM of 2–3% of central maxima.

IR Spectroscopic Characterization of Plant Leaves, Endemic to Hot Regions, in Two Senescent States

We propose monitoring the state of the health and senescence of the oak leaves in narrow spectral intervals around 0.9 µm, 1.8 µm and 3.45 µm. The easiest and the most cost-effective strategy would be to implement an electro-optical remote sensing system featuring a commercial camera incorporating a traditional Si CCD detector, and a wide transmission filter, blind to the visible radiation, from about 0.82 to 0.95 µm.