Patent ID: 8158929
Filing Date: 2012-04-17
Classification: G01J,G02B

Abstract:
1. A specular array for radiometric calibration, comprising: a plurality of spherical mirrors disposed upon a uniform background as at least one array of reflective points, at least two points reflecting a different intensity of directly incident sunlight, each mirror having a radius of curvature and a diameter, the radius of curvature and the diameter providing a field of regard, the collective mirrors providing a collective minimum calibratability field of regard, wherein the plurality of spherical mirrors are subgrouped into a first subgroup of mirrors arranged systematically on a cross point grid array, at least one mirror disposed at a cross point of the grid array, the remaining plurality of mirrors individually offset at a predetermined location from the cross points of the grid array; and a second subgroup of mirrors structured and arranged as an array of reflective points, at least two points reflecting a different intensity of directly incident sunlight.