evaluation of thermal distortion of simbiosys stereo camera for the bepicolombo mission
- Paper number
IAC-08.A3.6.7
- Author
Dr. Mirco Zaccariotto, CISAS G. Colombo Center of Studies and Activities for Space, University of Padova, Italy
- Coauthor
Prof. Stefano Debei, CISAS G. Colombo Center of Studies and Activities for Space, University of Padova, Italy
- Coauthor
Mr. Carlo Bettanini, CISAS G. Colombo Center of Studies and Activities for Space, University of Padova, Italy
- Coauthor
Dr. Paolo Ramous, CISAS G. Colombo Center of Studies and Activities for Space, University of Padova, Italy
- Coauthor
Prof. Gabriele Cremonese, INAF - Osservatorio astronomico di Padova, Italy
- Coauthor
Dr. Enrico Flamini, Italian Space Agency (ASI), Italy
- Year
2008
- Abstract
The BepiColombo mission is the ESA cornerstone mission to Mercury designed in cooperation with Japan to be launched in 2013,which main scientific objectives are the study of Mercury’s surface, interior structure and exosphere and the verification of general relativity and alternative theories of gravity. In order to optimize resources and achieve an optimal coordination between imaging and spectrometry channels, an instrument concept has been proposed in which all the imaging and spectroscopy tasks in the visual and near infrared band are achieved by a highly integrated suite, named SIMBIO-SYS (Spectrometers and Imagers for MPO BepiColombo - Integrated Observatory SYStem). This is intended to be the most effective to achieve an excellent scientific return, minimising the overall resource allocation. SIMBIO-SYS is composed by a High Resolution Imaging Channel (HRIC), a STereo imaging Channel (STC) and a VIsual and Infrared Hyperspectral Imager (VIHI) channel, sharing a common main electronics and power supply. The STC optical configuration has been designed to satisfy the scientific requirements to provide stereo and color images of the entire surface of Mercury with spatial resolution of 50 m/px from 400 km altitude. The selected detector is an APS 2048×2048 array with 10 ?m square pixel, which allows the coverage of the required 5° (cross track) field of view. The STC is composed by two identical cameras placed in the “along track” plane: the foreword and the backward channels are tilted at +20° and –20°, respectively, with respect to nadir, to allow stereo reconstruction of the images. This paper presents the results of the thermo-elastic analysis taking into account the operative temperature range and evaluating thermal distortions for critical optical elements focusing on displacement and rotation. These effects have been evaluated considering different configurations for the STC involving different mechanical structure layout and mirror and lenses mounting geometries. A sensitivity study is also presented for the effect of temperature gradient on mechanical distortion on STC components in the view of the definition of an optimized cost and mass saving configuration.
- Abstract document
- Manuscript document
(absent)