Diffusing screen for on-board radiometric calibration of the stereo-spectral-imaging system ARGUS for Mars 94/96 mission.

Details Diffusing screen for on-board radiometric calibration of the stereo-spectral-imaging system ARGUS for Mars 94/96 mission. Diffusing screen for on-board radiometric calibration of the stereo-spectral-imaging system ARGUS for Mars 94/96 mission.

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996metro..32..667m&link_type=abstract

Metrologia, Vol. 32, No. 6, p. 667 - 670

Computer Science

Space Instrumentation: Mars

Scientific paper

A new stereo-spectral-imaging system, ARGUS, has been developed for the Mars 94/96 mission and consists of three videospectrometers with a wide field-of-view covering the spectral range 320 nm to 5200 nm. The on-board radiometric calibration is based on a diffusing target illuminated by the Sun's radiation. The provision for a common target for all the videospectrometers of the ARGUS system allows an intercomparison of instruments to be carried out in addition to individual calibration verification. The development and testing of the target for on-board radiometric calibration is described and techniques for preparing the target surface are given. A brief description of the setup for measurements of the spectral and angular response of the target reflectivity is presented, together with results of the spectral and angular response of the target reflectivity, for an angle of incidence of -70° (relative to the normal) and at viewing angles from 0° to +60° at 2° intervals. The bidirectional reflectance factor of the target is reported for the spectral range 320 nm to 5200 nm at an angle of incidence of -70° and at a viewing angle of +20°.

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