دورية أكاديمية
Fractional loop delays in adaptive optics modeling and control.
| العنوان: | Fractional loop delays in adaptive optics modeling and control. |
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| المؤلفون: | Marquis L, Raynaud HF, Galland N, Marco de la Rosa J, Montilla I, Tubío Araújo Ó, Reyes García-Talavera M, Kulcsár C |
| المصدر: | Journal of the Optical Society of America. A, Optics, image science, and vision [J Opt Soc Am A Opt Image Sci Vis] 2024 Jan 01; Vol. 41 (1), pp. 111-126. |
| نوع المنشور: | Journal Article |
| اللغة: | English |
| بيانات الدورية: | Publisher: Optica Publishing Group Country of Publication: United States NLM ID: 9800943 Publication Model: Print Cited Medium: Internet ISSN: 1520-8532 (Electronic) Linking ISSN: 10847529 NLM ISO Abbreviation: J Opt Soc Am A Opt Image Sci Vis Subsets: PubMed not MEDLINE; MEDLINE |
| أسماء مطبوعة: | Publication: Washington, DC : Optica Publishing Group Original Publication: Washington, D.C. : Optical Society of America, c1993- |
| مستخلص: | This paper revisits the problem of optimal (minimum variance) control for adaptive optics (AO) systems when measurement and command applications are asynchronous, resulting in a non-integer servo loop delay. When not properly accounted for, such fractional delays may severely degrade the AO performance, especially in the presence of high-frequency vibrations. We present evidence of this performance degradation thanks to in-lab experimental measurements on the Gran Telescopio Canarias Adaptive Optics (GTCAO) system controlled with standard suboptimal linear quadratic Gaussian (LQG) controllers. A constructive, easy to implement LQG control design is then proposed and validated in a simulation for vibrations affecting the tip-tilt modes. Our methodology is very interesting because it allows a performance assessment for any linear controller in terms of variance, rejection transfer functions, power spectral densities, and stability margins. We also show how the continuous-time disturbance model can be derived from standard discrete-time disturbance data-based modeling. |
| تواريخ الأحداث: | Date Created: 20240104 Latest Revision: 20240104 |
| رمز التحديث: | 20240104 |
| DOI: | 10.1364/JOSAA.502531 |
| PMID: | 38175136 |
| قاعدة البيانات: | MEDLINE |
| تدمد: | 1520-8532 |
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| DOI: | 10.1364/JOSAA.502531 |