The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 23, 1990
Filed:
Jul. 28, 1988
Applicant:
Inventors:
Vincent T Bly, Springfield, VA (US);
Conrad W Terrill, Lorton, VA (US);
Donna J Advena, Springfield, VA (US);
Assignee:
The United States of America as represented by the Secretary of the Army, Washington, DC (US);
Primary Examiner:
Int. Cl.
CPC ...
G01D / ;
U.S. Cl.
CPC ...
250233 ; 250330 ;
Abstract
Incident infrared radiation is focussed through a rotatable disk of germam onto a detector array. The disk has a thickness many times the wavelengths of the incident radiation and is partly covered with a pattern of germanium one-half wavelength of some preselected wavelength of the incident radiation. The pattern is a regular array of mesas, and acts as a phase grating which diffracts incident radiation. The diffracted (or blurred) image on the detector array is used as a reference level for background suppression.