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    New papers on low order sensing and model identification



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    Join date : 2010-10-01

    New papers on low order sensing and model identification

    Post  SergeMeimon on Fri Oct 01, 2010 11:17 am

    Dear all,
    We are pleased to announce you that the following papers have been
    accepted for publication:

    LIFT: a focal-plane wavefront sensor for real-time low-order sensing on
    faint sources

    Serge Meimon , Thierry Fusco and Laurent M. Mugnier

    Optics Letters, Vol. 35, Issue 18, pp. 3036-3038 (2010)

    Abstract : We propose the linearized focal-plane technique (LIFT) and
    compare it to classical sensors, such as the quad-cell wavefront sensor
    (WFS), pyramid WFS, and Shack–Hartmann WFS. The number of modes sensed
    by LIFT can be tuned without any hardware modification nor degradation
    of low-order sensing performance. We derive an analytic model of the
    noise propagation law, which we validate on end-to-end simulations.

    Link: http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-18-3036

    Tip–tilt disturbance model identification for Kalman-based control
    scheme: application to XAO and ELT systems

    Serge Meimon, Cyril Petit , Thierry Fusco and Caroline Kulcsar

    JOSA A, Vol. 27, Issue 11, pp. A122-A132 (2010)

    Abstract : Adaptive optics (AO) systems have to correct tip–tilt (TT)
    disturbances down to a fraction of the diffraction-limited spot. This
    becomes a key issue for very or extremely large telescopes affected by
    mechanical vibration peaks or wind shake effects. Linear quadratic
    Gaussian (LQG) control achieves optimal TT correction when provided with
    the temporal model of the disturbance. We propose a nonsupervised
    identification procedure that does not require any auxiliary system or
    loop opening and validate it on synthetic profile as well as on
    experimental data.

    Link: http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-27-11-A122

    Best regards,
    Serge Meimon and the co-authors.

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