Specular array for radiometric calibration and method
US8158929B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 7, 2009 |
| Grant date | Apr 17, 2012 |
| Priority date | — |
| Expiry date | Feb 26, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2005/0077
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A specular array for radiometric calibration (SPARC) includes 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 has 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. Based upon the radius of curvature, the transmittance value of the sun to each mirror and from each mirror to a sensor being calibrated, the intensity of calibration light provided to the input aperture of a sensor to be calibrated within the collective minimum calibratability field of regard may be determined and used as a baseline for sensor calibration. An associated method of combined spatial and radiometric calibration is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.