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Use of Tunable Liquid Crystal Filters to Link Radiometric and Photometric Standards

A Lyot filter has been developed which uses precision liquid crystal waveplates to achieve tuning of the filter pass band over hundreds of nanometres. Tuning is rapid and non-mechanical, and produces a neglible shift in the transmitted image. Transmission is high (50%), and can be characterized using the methods developed for fixed-wavelength interference filters. Such a filter, coupled with a silicon photodiode trap detector whose radiometric response is well known, offers a direct method for linking detector-based radiometry and photometry.