Accession Number : ADD011389

Title :   Reduction of Signal Modulation Caused by Polarization in Visible Optical Scanning Systems.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Comer,M R

Report Date : 16 Oct 1984

Pagination or Media Count : 7

Abstract : A method of an apparatus for minimizing the polarization modulation effect of an optical scanner system which is an earth orbit and is scanning the earth, where the optical train of the scanner includes a plurality of optically aligned, rotatable, flat folding mirrors having incident angle normals in the same plane, with the mirrors serially reflecting an image acquired by the scanning of the system in orbit. The method includes the steps of rotating the most rearwardly disposed of the mirrors around its vertical geometric axis such that the reflecting surface of the mirror is perpendicular to the impinging image beam, and then rotating the mirror around its horizontal geometric axis such that the angle of incidence of the impinging image beam is of a preselected magnitude. This change in positioned relationship results in a novel apparatus which minimizes the aforesaid polarization modulation effect. (Author)

Descriptors :   *Patents, *Optical scanning, *Scanners, *Analyzers, *Polarizers, *Mirrors, Earth orbits, Polarization, Reflection, Angle of incidence, Horizontal orientation, Vertical orientation, Visible spectra, Modulation, Reduction, Optical equipment, Geometry, Surfaces, Axes, Signals

Subject Categories : Optical Detection and Detectors
      Optics
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE