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Patent Searching and Data


Title:
SPECULAR ARRAY FOR RADIOMETRIC CALIBRATION AND METHOD
Document Type and Number:
WIPO Patent Application WO/2008/100693
Kind Code:
A3
Abstract:
Provided is a specular array for radiometric calibration (SPARC). The array 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.

Inventors:
SCHILLER, Stephen J. (15422 Loretta Drive, La Mirada, California, 90638, US)
Application Number:
US2008/052083
Publication Date:
June 30, 2011
Filing Date:
January 25, 2008
Export Citation:
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Assignee:
RAYTHEON COMPANY (870 Winter Street, Waltham, Massachusetts, 02451-1449, US)
SCHILLER, Stephen J. (15422 Loretta Drive, La Mirada, California, 90638, US)
International Classes:
G01D18/00; G02B27/14; H01J40/14
Foreign References:
US5835267A1998-11-10
US5371358A1994-12-06
US7132648B22006-11-07
Attorney, Agent or Firm:
LENZEN, Glenn, H. et al. (Shughart Thomson & Kilroy P.C, 1050 Seventeenth Street Suite 230, Denver CO, 80265-2080, US)
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