10 November 2003 Mirror emissivity measurements for the NASA AURA HIRDLS instrument
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Proceedings Volume 5152, Infrared Spaceborne Remote Sensing XI; (2003); doi: 10.1117/12.514591
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States
Abstract
The High Resolution Dynamics Limb Sounder (HIRDLS) instrument is scheduled for launch on the NASA AURA satellite in January 2004; it is a joint project between the UK and USA. HIRDLS is a mid-infrared limb emission sounder which will measure the concentration of trace species and aerosol, and temperature and pressure variations in the Earth's atmosphere between about 8 and 100 km altitude on a finer spatial scale than been achieved before. HIRDLS has particularly stringent radiometric calibration accuracy requirements. A warm (280-300K) 'In-Flight Calibrator' (IFC) black cavity within the instrument plus a view to cold space are used to perform radiometric calibration. The cavity has an entrance aperture which is much smaller than the full beam size, and it is viewed through a focusing mirror. The cavity and focusing mirror are ideally maintained at the same temperature but differences of up to 1 C may exist, in which case a correction utilising the mirror emissivity can usefully be made. That emissivity has been measured at instrument level during pre-launch calibration by viewing an external target at the same temperature as the IFC while varying the calibration mirror temperature.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John J. Barnett, Karim Djotni, Christopher L. Hepplewhite, Olusoji O. Oduleye, Christopher W. P. Palmer, Daniel M. Peters, Trevor W. Walton, Robert E. J. Watkins, John G. Whitney, John C Gille, Philip I. Arter, Bruno Nardi, "Mirror emissivity measurements for the NASA AURA HIRDLS instrument", Proc. SPIE 5152, Infrared Spaceborne Remote Sensing XI, (10 November 2003); doi: 10.1117/12.514591; https://doi.org/10.1117/12.514591
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KEYWORDS
Mirrors

Calibration

Temperature metrology

Aerosols

Earth's atmosphere

Infrared radiation

Infrared sensors

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