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1 March 1974 Visual Circular Variable Filters
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Abstract
The visual circular variable filter (VCVF) is introduced. A typical filter is described with layer thickness that varies linearly along a circular path. Typical spectral results are presented. Bandwidths of 10 to 50 nm and peak transmittances of 15 to 50 percent are possible. Manufacturing problems are considered, and a technique is described that utilizes two rotating masks between the evaporation source and the substrate to produce layer thickness variations. Uses and advantages of VCVF's are also presented. Typical applications include instruments such as colorimeters, spectrometers, and water pollution analyzers.
© (1974) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dennis Kitchens "Visual Circular Variable Filters", Proc. SPIE 0050, Optical Coatings: Applications and Utilization I, (1 March 1974); doi: 10.1117/12.954112; https://doi.org/10.1117/12.954112
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