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Proceedings Paper

HP3-RAD: a compact radiometer design with on-site calibration for in-situ exploration
Author(s): Emanuel Kopp; Nils Mueller; Matthias Grott; Ingo Walter; Jörg Knollenberg; Frank Hanschke; Ernst Kessler; Hans-Georg Meyer
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Paper Abstract

Many processes on planetary bodies are driven by their respective surface energy balance, and while planetary climate is influenced by the dynamics of the atmospheric boundary layer, surface radiation drives the Yarkovksy and YORB effects on small airless bodies. In addition, insolation governs cometary activity and drives the dust cycle on Mars. The radiative flux received and emitted at the surface of solar system bodies is thus a fundamental quantity, which is driven by the reception of solar radiation in the visible wavelength band, while re-radiation primarily occurs in the thermal infrared. Knowledge of the relevant radiative fluxes enables studies of thermo-physical surface properties, and radiometers to measure surface brightness temperatures have been payloads on many missions. The HP3-RAD is part of the Heat Flow and Physical Properties Package (HP3) on the InSight mission to Mars. It is a light-weight thermal infrared radiometer with compact design. HP3-RAD measures radiative flux in 3 spectral bands using thermopile detectors. The 120 g device includes integrated front-end electronics as well as a deployable cover that protects the sensors from dust contamination during landing. In addition, the cover is simultaneously used as a calibration target. The instrument concept as well as its implementation will be described, and special emphasis will be put on technological challenges encountered during instrument development. Potential future improvements of the design will be discussed.

Paper Details

Date Published: 14 September 2016
PDF: 16 pages
Proc. SPIE 9973, Infrared Remote Sensing and Instrumentation XXIV, 99730T (14 September 2016); doi: 10.1117/12.2236190
Show Author Affiliations
Emanuel Kopp, DLR Institute of Optical Sensor Systems (Germany)
Nils Mueller, DLR Institute of Planetary Research (Germany)
Matthias Grott, DLR Institute of Planetary Research (Germany)
Ingo Walter, DLR Institute of Optical Sensor Systems (Germany)
Jörg Knollenberg, DLR Institute of Planetary Research (Germany)
Frank Hanschke, DLR Institute of Planetary Research (Germany)
Ernst Kessler, Institute of Photonic Technology (Germany)
Hans-Georg Meyer, Institute of Photonic Technology (Germany)

Published in SPIE Proceedings Vol. 9973:
Infrared Remote Sensing and Instrumentation XXIV
Marija Strojnik, Editor(s)

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