Slotted Cylindrical Rotors for Photometric Calibration

Abstract
Hollow cylindrical rotors with slotted walls can be used as substitutes for sector disks for some photometric applications. Designs are given of rotors which can replace a logarithmic sector, fixed sector disk, step sector, and variable sector disk. Some of these rotors may be used with non‐parallel light. A rotor corresponding to a variable sector disk has been built with a variable slot which can be adjusted to several different openings while inside a vacuum system.

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