&lt;title&gt;Canada-France-Hawaii Telescope adaptive optics bonnette II: simulations and control&lt;/title&gt;

Rigaut, François; Arsenault, Robin; Kerr, John M.; Salmon, Derrick; Northcott, M. J.; Dutil, Yvan; Boyer, Corinne

doi:10.1117/12.176039

Cited by 14 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our bimorph DM is planned to coordinate with our curvature wavefront sensor [17] , so the concentric sector pattern is the optimal choice for our AO system. According to simulation results of concentric sector pattern [14,18] …”

Section: The Structure Designmentioning

confidence: 99%

Double-layer PMN bimorph deformable mirror system optimization design and fabrication technology

Sun

Jiang

2009

SPIE Proceedings

View full text Add to dashboard Cite

In this paper we present a novel bimorph deformable mirror composed of double-layer lead magnesium niobate (PMN) slices. Compared with lead zirconate titanate (PZT), PMN has better physical features served as bimorph mirror. The optimization design of the mirror electrodes pattern and mirror size are investigated. The type of conductive adhesive and coating process are proposed. An improved mounting apparatus using O-type rubber rings for flexible mounting the mirror is innovated. Also the control circuit model and the interface unit with computer are investigated and designed. A mature design proposal and technology of bimorph deformable mirror system is presented.

show abstract

Section: The Structure Designmentioning

confidence: 99%

Double-layer PMN bimorph deformable mirror system optimization design and fabrication technology

Sun

Jiang

2009

SPIE Proceedings

View full text Add to dashboard Cite

show abstract

“…The most promising techniques to date have used piezoelectric materials control techniques (Mikoshiba and Ahlborn 1972;Feinleib, Lipson, and Cone 1974;Adelman 1977;Kokorowski 1979;Steinhaus and Lipson 1979;Sato, Ueda, and Ikeda 1981;Forbes et al 1989;Ikramov et al 1992;Rigaut et al 1994;Susini, Labergerie, and Zhang 1994). Both unimorph and bimorph structures have been investigated for control of mirror curvature as a function of voltage input.…”

Section: Previous Research Into Control Of Thin-film Membrane Mirrorsmentioning

confidence: 99%

Deployable large aperture optics system for remote sensing applications.

Sumali¹,

Martin²,

Main

et al. 2004

View full text Add to dashboard Cite

This report summarizes research into effects of electron gun control on piezoelectric polyvinylidene fluoride (PVDF) structures. The experimental apparatus specific to the electron gun control of this structure is detailed, and the equipment developed for the remote examination of the bimorph surface profile is outlined. Experiments conducted to determine the optimum electron beam characteristics for control are summarized. Clearer boundaries on the bimorphs' control output capabilities were determined, as was the closed loop response. Further controllability analysis of the bimorph is outlined, and the results are examined. In this research, the bimorph response was tested through a matrix of control inputs of varying current, frequency, and amplitude. Experiments also studied the response to electron gun actuation of piezoelectric bimorph thin film covered with multiple spatial regions of control. Parameter ranges that yielded predictable control under certain circumstances were determined. Research has shown that electron gun control can be used to make macrocontrol and nanocontrol adjustments for PVDF structures. The control response and hysteresis are more linear for a small range of energy levels. Current levels needed for optimum control are established, and the generalized controllability of a PVDF bimorph structure is shown. 4This page intentionally left blank.5

show abstract

“…(26) from the WFS measurements w and the control matrix D + , C nn from the measurement noise and D + , and C rr by simulation of the adaptive optics system in the presence of Kolmogorov turbulence. For this, we use a program written by F. Rigaut (Rigaut et al 1994). To fix the ideas, Fig.…”

Section: The Long-exposure Imagementioning

confidence: 99%

Estimating the point spread function of the adaptive optics system ADONIS using the wavefront sensor measurements

Harder

Chelli

2000

Astron. Astrophys. Suppl. Ser.

View full text Add to dashboard Cite

Abstract. Adaptive Optics (AO) has been developed to compensate the wavefront deformation due to the atmospheric turbulence. The wavefront correction, however, is often only partial and a residual blur is present in a long exposure image. It is therefore important to deconvolve the image to do accurate photometry or to detect faint structures. For this, the point spread function (PSF) has to be known. The PSF is highly variable in time and difficult to calibrate. We developed an algorithm which reconstructs the PSF of the ADONIS AO system from the wavefront sensor measurements. We present the results obtained for different observing conditions and discuss the limits of the method. We prove the existence of a local non-stationary turbulence from analyzing the spatial and temporal behaviour of the turbulent phase. We found difficult to achieve photometric precision higher than 5 to 10% on secondary components of multiple systems with flux ratio larger than 4.

show abstract

<title>Canada-France-Hawaii Telescope adaptive optics bonnette II: simulations and control</title>

Cited by 14 publications

References 0 publications

Double-layer PMN bimorph deformable mirror system optimization design and fabrication technology

Double-layer PMN bimorph deformable mirror system optimization design and fabrication technology

Deployable large aperture optics system for remote sensing applications.

Estimating the point spread function of the adaptive optics system ADONIS using the wavefront sensor measurements

Contact Info

Product

Resources

About