Calibration of a helium-cooled infrared spatial radiometer and grating spectrometer

Larry E. Jacobsen; Steven D. Sargent; Clair L. Wyatt; Allan J. Steed

doi:10.1117/12.23048

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1 November 1990 Calibration of a helium-cooled infrared spatial radiometer and grating spectrometer

Larry E. Jacobsen, Steven D. Sargent, Clair L. Wyatt, Allan J. Steed

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Proceedings Volume 1340, Cryogenic Optical Systems and Instruments IV; (1990) https://doi.org/10.1117/12.23048
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

Abstract

Methods used by the Space Dynamics Laboratory of Utah State University (SDL/USU) to calibrate infrared sensors are described, using the Infrared Background Signature Survey (IBSS) spatial radiometer and grating spectrometer as examples. A calibration equation and a radiometric model are given for each sensor to describe their responsivity in terms of individual radiometric parameters. The calibration equation terms include dark offset, linearity, absolute responsivity, and measurement uncertainty, and the radiometric model domains include spatial, spectral, and temporal domains. A portable calibration facility, designed and fabricated by SDL/USU, provided collimated, extended, diffuse scatter, and Jones sources in a single cryogenic dewar. This multi-function calibrator allowed calibration personnel to complete a full calibration of the IBSS infrared radiometer and spectrometer in two 15-day periods. A calibration data system was developed to control and monitor the calibration facility, and to record and analyze sensor data.

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Larry E. Jacobsen, Steven D. Sargent, Clair L. Wyatt, and Allan J. Steed "Calibration of a helium-cooled infrared spatial radiometer and grating spectrometer", Proc. SPIE 1340, Cryogenic Optical Systems and Instruments IV, (1 November 1990); https://doi.org/10.1117/12.23048

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