Visual Circular Variable Filters

Dennis Kitchens

doi:10.1117/12.954112

1 March 1974 Visual Circular Variable Filters

Dennis Kitchens

Proceedings Volume 0050, Optical Coatings: Applications and Utilization I; (1974) https://doi.org/10.1117/12.954112
Event: Acquisition and Analysis of Pictorial Data, 1974, San Diego, United States

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.

Citation Download Citation

Dennis Kitchens "Visual Circular Variable Filters", Proc. SPIE 0050, Optical Coatings: Applications and Utilization I, (1 March 1974); https://doi.org/10.1117/12.954112

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