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:
May. 16, 1995
Filed:
Oct. 01, 1993
Wallace W Chen, La Palma, CA (US);
I-Fu Shih, Los Alamitos, CA (US);
Hughes Aircraft Company, Los Angeles, CA (US);
Abstract
An improved wide-spectrum test target assembly, with visual and near IR (infrared) targets integrated with a long wavelength emissivity target. A single relatively thick optical fiber (78) is used to receive target signals emitting from several thinner fibers (72, 74, 76), each carrying a signal of different wavelength. The integrated signal is then relayed to an aperture (108) of an emissivity target through a gradient index lens (88) to further combine with the long wavelength target signal emitted from the emissivity target assembly (100). By selecting appropriate numerical apertures and diameters of the fibers, relatively high power output is achieved. A light collimator (200) is also disclosed for collimating light generated by the test target assembly to simulate targets at infinity. The collimator includes a primary mirror (220) which is an off-axis section of a paraboloidal mirror, a secondary mirror (230) which is an off-axis section of a hyperboloidal mirror, and a support structure/baffle (210) which supports the mirrors in proper relation and also includes an integrated light baffle surface to prevent light from the test target assembly from passing directly to an image plane.