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Radiometric calibration device and method

  • US 5,835,267 A
  • Filed: 07/15/1997
  • Issued: 11/10/1998
  • Est. Priority Date: 07/15/1997
  • Status: Expired due to Term
First Claim
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1. Apparatus for radiometrically calibrating an imaging sensor array using the sun as a calibration light source in an optical system of the type having an accessible real conjugate of an entrance pupil, comprising:

  • a) a flux concentrator for concentrating sunlight;

    b) a flux modulator for modulating the intensity of the concentrated sunlight;

    c) a flux relay for relaying the intensity modulated sunlight to the real conjugate of the entrance pupil of the optical system; and

    d) a flux diffuser located at the real conjugate of the entrance pupil of the optical system for illuminating the imaging sensor array with diffuse intensity modulated sunlight.

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