Abstract
This chapter begins with a brief description of the requirements for image quality, the measurement of the wavefront aberration with a Shack–Hartmann (SH) sensor and its decomposition in a set of orthogonal functions named the Zernike modes. Next, the Kolmogorov turbulence model is used, together with the assumption of frozen turbulence shape transported by the wind to evaluate the RMS value of the phase error, the image quality, and the power spectral density of the various Zernike modes. The next section discusses the main features of deformable mirrors for adaptive optics, with a special attention to the bimorph piezoelectric mirrors in various actuator configurations (keystone and honeycomb). The following section is devoted to the feedback control using a frequency-shaped singular value decomposition (SVD) controller and assuming a quasi-static response of the deformable mirror; the closed-loop response of the various Zernike modes and the RMS phase error is evaluated as a function of the control bandwidth. Next, a dynamical model of the mirror is used and the control-structure interaction is analyzed, leading to spillover; the importance of the structural damping of the vibration modes is pointed out. The damping augmentation via passive piezo shunt and active damping using modal filtering is then analyzed. The chapter concludes with some remarks on manufacturing and a list of references.
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Notes
- 1.
We will use this word regardless of how many active layers are involved in the configuration provided they act in the \(d_{31}\) mode.
References
Alaluf D (2016) Piezoelectric mirrors for adaptive optics in space telescopes. Ph.D. thesis, Université Libre de Bruxelles, Active Structures Laboratory
Bastaits R, Alaluf D, Belloni E, Rodrigues G, Preumont A (2014) Segmented bimorph mirrors for adaptive optics: morphing strategy. Appl Opt 53(22):4825–4832
Bastaits R, Alaluf D, Horodinca M, Romanescu I, Burda I, Martic G, Rodrigues G, Preumont A (2014) Segmented bimorph mirrors for adaptive optics: segment design and experiment. Appl Opt 53(29):6635–6642
Bely PY (2003) The design and construction of large optical telescopes. Springer, Berlin
Blevins RD (1979) Formulas for natural frequencies and mode shapes, Van Nostrand Reinhold
Conan JM, Rousset G, Madec PY (1995) Wave-front temporal spectra in high-resolution imaging through turbulence. J Opt Soc Am A 12(7):1559–1570
Dainty JC (2010) Optical effects of atmospheric turbulence. Laser guide star adaptive optics for astronomy. Springer, Berlin
Enard D, Marechal A, Espiard J (1996) Progress in ground-based optical telescopes. Rep Prog Phys 59:601–656
Feng X, Huang Y, Jiang H, Ngo D, Rosakis AJ (2006) The effect of thinfilm/substrate radii on the Stoney formula for thin film/substrate subject to nonuniform axisymmetric misfit strain and temperature. J Mech Mater Struct 1(6):1041–1053
Freund LB, Suresh S (2003) Thin film materials. Stress, defect formation and surface evolution. Cambridge University Press, Cambridge
Greenwood DP (1977) Bandwidth specification for adaptive optics systems. JOSA 67:390–393
Hardy JW (1998) Adaptive optics for astronomical telescopes. Oxford University Press, Oxford
Madec PY (2012) Overview of deformable mirror technologies for adaptive optics and astronomy. In: SPIE astronomical telescopes+ instrumentation
Meirovitch L, Baruh H (1985) The implementation of modal filters for control of structures. AIAA J Guid Control Dyn 8(6):707–716
Noll RJ (1976) Zernike polynomials and atmospheric turbulence. J Opt Soc Am A 66:207–211, March
Preumont A, Bastaits R, Rodrigues G (2009) Scale effects in active optics of large segmented mirrors. Mechatronics 19(8):1286–1293
Roddier F (1999) Adaptive optics in astronomy. Cambridge University Press, Cambridge
Rodrigues G (2010) Adaptive optics with segmented deformable bimorph mirrors. Ph.D. thesis, Université Libre de Bruxelles, Active Structures Laboratory
Rodrigues G, Bastaits R, Roose S, Stockman Y, Gebhardt S, Schoenecker A, Villon P, Preumont A (2009) Modular bimorph mirrors for adaptive optics. Opt Eng 38(3):034001
Tyson RK (2000) Introduction to adaptive optics. SPIE Press, Washington
Wang K, Alaluf D, Mokrani B, Preumont A (2017) Dynamic control of deformable mirrors for adaptive optics. In: ECCOMAS thematic conference on smart structures and materials, Madrid
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Preumont, A. (2018). Active Control of Large Telescopes: Adaptive Optics. In: Vibration Control of Active Structures. Solid Mechanics and Its Applications, vol 246. Springer, Cham. https://doi.org/10.1007/978-3-319-72296-2_16
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DOI: https://doi.org/10.1007/978-3-319-72296-2_16
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