Patent ID: 8507843

Claim:
A system for spectral calibration of a remote sensing sensor, comprising: a plurality of reflective mirrors configured and arranged to reflect radiation from a source of radiation onto a remotely located radiation sensor, wherein a first mirror in the plurality of mirrors is configured to reflect a first portion of the radiation in a first wavelength toward the remotely located radiation sensor and a second mirror in the plurality of mirrors is configured to reflect a second portion of the radiation in a second wavelength different from the first wavelength toward the remotely located radiation sensor, wherein the first portion of the radiation and the second portion of the radiation are selected to calibrate the remotely located radiation sensor so as to provide a quantitative spectral relationship between the radiation detected at the remotely located sensor and the radiation reflected by the plurality of mirrors, and wherein a cone angle or field-of-regard of the radiation reflected by the plurality of mirrors and measured by the sensor is maintained constant when a radius of curvature of one or more mirrors in the plurality of mirrors is increased and a size of the one or more mirrors in the plurality of mirrors is increased.