Ronald J Armstrong

US Patent:

49282948, May 22, 1990

Filed:

Mar 24, 1989

Appl. No.:

7/330348

Inventors:

Warren T. Beard - Upper Marlboro MD
Ronald W. Armstrong - Edgewater MD

Assignee:

U.S. Government as represented by the Director, National Security Agency - Fort George G. Meade MD

International Classification:

G01N 2320

US Classification:

378 74

Abstract:

An improved asymmetric crystal topography x-ray imaging system employing a ine focus horizontal line source of x-rays and a crystal monochromator used in a compression mode. Relatively large horizontal and vertical dimensions of the monochromating crystal allow imaging of larger areas of imperfect crystals than previously possible, without adversely affecting image resolution. The high resolution two-dimensional images are a direct consequence of our method of controlling the probe beam divergences. An appreciably enhanced and useful intensity of monochromatic x-rays is obtained over that available with prior asymmetric crystal topography systems.