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The Role of Wedge Filters in Spectroscopy
Linear Variable Filters (LVFs or "wedge filters") have found increasing applicability in spectrally selective optical instruments. The present invention relates to spectrometers and, in particular, relates to a wedge-filter spectrometer having a compact wedge-shaped spectral disperser optically coupled to an electro-optical detector and also relates to apparatus and methods of fabricating a wedge-shaped spectral disperser. This design already. actured in a gold layer deposited on a calcium fluoride substrate. They perform extremely well as "sliding. Our instruments were modified for aircraft use primarily by automating the repetitive measurements and incorporating image intensifier tubes to reduce exposure times, thereby minimising smear of photographs due to aircraft roll. Three separate instruments were flown. (I) A 35-mm camera obtained. Filters Interference Filters Consist of transparent dielectric (i.
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