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Identification of t...
Identification of the dynamics of time-varying phase aberrations from time histories of the point-spread function
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- Doelman, Reinier (författare)
- Delft Univ Technol, Netherlands
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- Klingspor, Måns (författare)
- Linköpings universitet,Reglerteknik,Tekniska fakulteten
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- Hansson, Anders (författare)
- Linköpings universitet,Reglerteknik,Tekniska fakulteten
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- Löfberg, Johan (författare)
- Linköpings universitet,Reglerteknik,Tekniska fakulteten
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- Verhaegen, Michel (författare)
- Delft Univ Technol, Netherlands
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(creator_code:org_t)
- OPTICAL SOC AMER, 2019
- 2019
- Engelska.
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Ingår i: Optical Society of America. Journal A. - : OPTICAL SOC AMER. - 1084-7529 .- 1520-8532. ; 36:5, s. 809-817
- Relaterad länk:
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https://liu.diva-por... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- To optimally compensate for time-varying phase aberrations with adaptive optics, a model of the dynamics of the aberrations is required to predict the phase aberration at the next time step. We model the time-varying behavior of a phase aberration, expressed in Zernike modes, by assuming that the temporal dynamics of the Zernike coefficients can be described by a vector-valued autoregressive (VAR) model. We propose an iterative method based on a convex heuristic for a rank-constrained optimization problem, to jointly estimate the parameters of the VAR model and the Zernike coefficients from a time series of measurements of the point-spread function (PSF) of the optical system. By assuming the phase aberration is small, the relation between aberration and PSF measurements can be approximated by a quadratic function. As such, our method is a blind identification method for linear dynamics in a stochastic Wiener system with a quadratic nonlinearity at the output and a phase retrieval method that uses a time-evolution-model constraint and a single image at every time step. (c) 2019 Optical Society of America.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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