Accession Number : ADD011114

Title :   Varying Bandpass of Optical Spatial Filter by Rotating Mirrors Having Changing Reflectivity.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Evans,D W

Report Date : 15 May 1984

Pagination or Media Count : 7

Abstract : In a system of real-time coherent optical filtering of visual imagery having a Fabry-Perot interferometer for use as a variable bandpass spatial filter, the improvement relates to the pair of mirrors of the interferometer mounted in spaced parallel relationship to one another for rotation about a common axis. The mirrors each have a reflectivity value which changes as a function of rotation. Thus, the bandwidth of the interferometer in acting as a filter can be adjusted by merely rotating one or both of the mirrors. (Author)

Descriptors :   *Patents, *Optical filters, *Fabry perot interferometers, *Mirrors, Reflectivity, Rotation, Bandpass filters, Real time, Coherence, Spatial filtering, Light sources

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE