Laboratory demonstration of optimal identification and control of tip-tilt systems

Aditya R. Sengupta; Benjamin L. Gerard; Daren Dillon; Maaike van Kooten; Donald Gavel; Rebecca Jensen-Clem

doi:10.1117/12.2630765

29 August 2022 Laboratory demonstration of optimal identification and control of tip-tilt systems

Aditya R. Sengupta, Benjamin L. Gerard, Daren Dillon, Maaike van Kooten, Donald Gavel, Rebecca Jensen-Clem

Proceedings Volume 12185, Adaptive Optics Systems VIII; 1218578 (2022) https://doi.org/10.1117/12.2630765
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

We present the results of testing optimal linear-quadratic-Gaussian (LQG) control for tip and tilt Zernike wavefront modes on the SEAL (Santa cruz Extreme AO Lab) testbed. The controller employs a physics model conditioned by the expected tip/tilt power spectrum and vibration peaks. The model builds on similar implementations, such as that of the Gemini Planet Imager, by considering the effects of loop delays and the response of the control hardware. Tests are being performed on SEAL using the Fast Atmospheric Self-coherent camera Technique (FAST), and being executed using a custom Python library to align optics, generate interaction matrices, and perform real-time control by combining controllers with simulated disturbance signals to be corrected. We have carried out open-loop data collection, characterizing the natural bench dynamics, and have shown a reduction in RMS wavefront error due to integrator control and LQG control.

Citation Download Citation

Aditya R. Sengupta, Benjamin L. Gerard, Daren Dillon, Maaike van Kooten, Donald Gavel, and Rebecca Jensen-Clem "Laboratory demonstration of optimal identification and control of tip-tilt systems", Proc. SPIE 12185, Adaptive Optics Systems VIII, 1218578 (29 August 2022); https://doi.org/10.1117/12.2630765

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