Accession Number : ADD009471

Title :   Method and Apparatus for Detecting Small Angular Beam Deviations.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Peterson,Phillip R ; Gavrielides,Athanasios ; Erkkila,John H

Report Date : 07 Mar 1980

Pagination or Media Count : 9

Abstract : A method and apparatus for detecting small angular deviations of an input beam which utilizes a pair of diffraction gratings in series, both of which are operating in the Wood's anomaly region. As a result, the output intensity of the doubly diffracted input beam is at a maximum. Any deviation from the Wood's anomaly region by the input beam will substantially reduce the intensity of the output. The intensity variance is detected and utilized as an indication of a small angular deviation of the input beam. (Author)

Descriptors :   *Patents, *Laser beams, Angles, Diffraction, Input, Output, Detection

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE