Deployable Space Telescope
Redesign of the secondary mirror support structure
Ilja Akkerhuis (TU Delft - Aerospace Engineering)
J. Bouwmeester – Mentor (TU Delft - Space Systems Egineering)
E.K.A. Gill – Graduation committee member (TU Delft - Space Engineering)
J.M. Kuiper – Mentor (TU Delft - Space Systems Egineering)
S.J. de Vet – Mentor (TU Delft - Astrodynamics & Space Missions)
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Abstract
The need for higher spatio-temporal resolution Earth observation increases rapidly. To fill this need, the Deployable Space Telescope (DST) project aims to make a light-weight, low-volume deployable telescope. In doing so, the achievable ground resolution is high while the cost per telescope stays low. This allows for the DST to be used in constellations, thus effectively achieving a high spatio-temporal resolution. One of the issues of this design are the relative translation and rotation of the secondary mirror due to temperature fluctuations. This thesis work focused on first finding these movements by identifying the temperature variations of the secondary mirror support structure using ESATAN TMS simulations, and subsequently designing a system to keep these movements within the allowed budgets. The end-result is a novel design in which all displacements are measured by means of 4 Displacement Measuring Interferometers and corrected by means of 4 linear piezo actuators.