Mr. Stephan Schachner Profile

Stephan Schachner

at Technische Univ Wien

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Proceedings Article | 29 August 2022 Poster + Paper

Feed-forward vibration compensation for small telescopes

Andreas Sinn, Stephan Schachner, Thomas Riel, Christian Schwaer, Georg Schitter

Proceedings Volume 12188, 121883H (2022) https://doi.org/10.1117/12.2626965

KEYWORDS: Telescopes, Linear filtering, Sensors, Control systems, Mirrors, Visible radiation

Read Abstract +

This publication investigates the applicability of feed-forward vibration compensation for small telescope systems in one axis, based on commercial-off-the-shelf accelerometers and a fast-steering mirror (FSM). The vibrations are measured with multiple accelerometers and their influence onto the optical path is reconstructed using a highpass filtered double integrator. Consequently, the reconstructed deviations are compensated in a feed-forward control manner by the FSM. A quad-photo-diode and an artificial star are used for verification of the performance of the system. Exemplary disturbance spectra are acquired on a roof-top using a small telescope system. They are applied to the developed system in a laboratory environment, successfully demonstrating the applicability of the proposed compensation concept by reducing the RMS tip-tilt error of the azimuth axis by a factor of 2.2 in the relevant frequency range.

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