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20 August 2008 Vacuum compatible large uniform-radiance source for ground calibration of satellite cameras inside a thermal vacuum environment
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Abstract
A vacuum compatible integrating sphere was built to operate inside a thermal vacuum chamber. This paper presents the design and test results for a 1.65 meter diameter vacuum compatible integrating sphere with a 1.0 meter diameter exit port and approximately 10kW of internal tungsten lamps. Liquid nitrogen is used as cooling medium to remove the heat generated by these lamps. There are no moving parts inside the vacuum chamber. The radiance is monitored with two filter-wheel detectors, one TE-cooled silicon and one TE-cooled germanium, as well as a TE-cooled silicon array spectrometer. All three detectors are located outside the thermal vacuum chamber and view the sphere radiance through fiber optic cables. The system was tested inside a thermal vacuum chamber at NASA Goddard Space Flight Center before commissioning in the 5.5 meter thermal vacuum chamber at Space Applications Centre in Ahmedabad, India. Results of tests of radiance uniformity, radiance levels, and radiance stability are presented. Comparisons of the filter radiometers with the array spectrometer are also presented.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Angelo V. Arecchi, Samir Pal, Joseph W. Jablonski, Marc Gervais, Mark Gugliotta, Harish Seth, Arun Bhardwaj, and Hari Sankar Sahoo "Vacuum compatible large uniform-radiance source for ground calibration of satellite cameras inside a thermal vacuum environment", Proc. SPIE 7081, Earth Observing Systems XIII, 708103 (20 August 2008); https://doi.org/10.1117/12.794819
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