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In-Flight Results of the Sciamachy Optical Assembly Active Thermal Control System
Technical Paper
2004-01-2357
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Sciamachy is a Dutch/German Earth Observation Instrument on the European Envisat satellite, which was successfully launched on March 1st, 2002. The goal of the instrument is to observe concentrations of trace gases in the atmosphere.
Due to the required optical accuracy of the instrument special thermal control methods have been incorporated in the instrument design. Amongst these are the active thermal control loops for the optical bench module.
The optical bench module is therefore provided with three feedback-controlled heater loops.
During the commissioning phase, the active thermal control systems in the instrument have been characterised in order to optimise their use during the operational phase of the instrument.
The paper will focus on the thermal design of the optical bench, the control algorithm of the active control system, in-orbit thermal observations of the last 2 years in space, the correlation with the thermal predictions, the fine-tuning of the (temperature) setpoints of the Active Thermal Control system and the lessons learned in this process.
The results show that all OBM control loops show a stability in line with predictions and well within requirements. Also the seasonal variation is in line with predictions. Only the average total power level demanded by the OBM controllers is slightly lower than predicted. However after 2 years in orbit the degradation found is significantly lower that predicted. Therefore, nominal and stable operation of the OBM will be possible for its entire lifetime.
Authors
Citation
Lemmen, M., Kouwen, J., Koorevaar, F., and Pennings, N., "In-Flight Results of the Sciamachy Optical Assembly Active Thermal Control System," SAE Technical Paper 2004-01-2357, 2004, https://doi.org/10.4271/2004-01-2357.Also In
References
- Reijneker P. Deutz A. Sciamachy optical assembly thermal design 24 th ICES and 5th European Symposium on Space Environmental Control Systems Friedrichshafen, Germany June 20-23 1994
- Wigbers I. The Design Development and Qualification of the Sciamachy Radiant Cooler 9 th Cryocooler Conference Waterville Valley, New Hampshire, USA June 25-27 1996
- Coesel Rinus Cruijssen Henk Wigbers Ino The development of the Sciamachy Radiant Cooler 6th European Symposium on Space Environmental Control Systems 1 169 173 Noordwijk, The Netherlands 20-22 May 1997
- Lemmen M.H.J. Coesel M.J.N. Thermal balance test results of Sciamachy Thermal Bus Unit 6th European Symposium on Space Environmental Control Systems 1 233 237 Noordwijk, The Netherlands 20-22 May 1997
- Active Thermal Control System of the Sciamachy Optical assembly Boslooper E.C. Kouwen J. Barbosa H. Fokker Space, Leiden Proceedings of the 6 th European Symposium on Space Environmental Control Systems Noordwijk 20-22 may 1997 August 1997
- Thermal qualification of the Sciamachy passive cryogenic cooler Lemmen M.H.J. Boslooper E.C. Coesel M.J.N. International Conference on Environmental Systems (SAE) Denver, CO, USA July 1999
- Sciamachy, Ready for Launch Kamp A. Dobber M. van der Linden R. Acta Astronautica 47 2-9 289 296 2000
- Optimization of thermal control systems during Sciamachy commissioning phase Pennings N.H. 32nd International Conference on Environmental Systems (ICES) San Antonio, TX, USA July 2002
- In-Orbit Experience with Sciamachy Active Thermal Control Systems Lemmen Martin Koorevaar Fred Pennings Nico International Conference on Environmental Systems (ICES) Vancouver, BC, Canada July 2003
- One Year Operations of the MITA Mini-Satellite Validation of the Thermal Design from On-Orbit Data Molina M. Lupi T. Annoni G. Latini V. International Conference on Environmental Systems (ICES) Orlando, Florida, USA July 2001