| Autor: |
Peters, Daniel M., Smith, Dave, Nightingale, Tim, Izdebski, Frauke, Pearce, Jonathan V., Veltcheva, Radka I., Adibekyan, Albert, Reiniger, Max, Monte, Christian |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2024, Vol. 3230 Issue 1, p1-9, 9p |
| Abstrakt: |
Satellite measurements in the thermal infrared are an essential tool in monitoring the Earth's climate, predicting weather and for scientific research in Earth observation. They require stable calibration source(s) in-flight to correct for instrument self-emission and allow radiometric calibration that is traceable to the SI. To date thermal infrared in-flight calibration sources use some form of electrical thermometer combined with a high emissivity surface to allow radiometric calibration using Planck's law [1]. Once launched, instrument re-calibration traceable to the SI is currently not possible. The traditional space industry launches large climate class instruments which are conservative in the application of new technologies as the cost of launch is high. To fly new technology requires significant effort to reduce risk and ensure a very low failure rate in-flight. In this paper, we outline three new technology developments that will enable high performance in-flight calibration with well characterized uncertainties which are insensitive to thermometer drift [1]. Key technology developments include new thermometer readout electronics, high emissivity coatings and ITS-90 [2] in-flight traceability. These activities have been funded by the UK Space Agency via the Center for Earth Observation Instrumentation (CEOI) during the Next Generation Infrared Target (NGenIRS) project. NGenIRS was demonstrated by comparison of the emitted radiance at the PTB Reduced Background Calibration Facility 2 with PTB reference sources [3]. Funding was part of the Far-infrared Outgoing Radiation Understanding and Monitoring (FORUM) Phase A/B development with Airbus for the ESA Earth Explorer 9 program. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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