Thomas Ruppel

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The use of high speed adaptive secondary mirrors (AS) in cassegrain or Gregorian telescopes shows high optical efficiency as well as the possibility to make adaptive optics (AO) available at all foci. After 4 years of extensive and successful use of a 336-actuator AS (MMT336) at the multi mirror telescope (MMT), the need for faster control methods of the AS(More)
A mechanically motivated strategy for determining actuator locations for minimum force modal control of continuous faceplate deformable mirrors in adaptive optics systems is proposed. It is shown that numerically or analytically derived eigenmodes of deformable mirrors can be used to determine optimal positions for a limited number of actuators. The(More)
The crosstalk problem of holography-based modal wavefront sensing (HMWS) becomes more severe with increasing aberration. In this paper, crosstalk effects on the sensor response are analyzed statistically for typical aberrations due to atmospheric turbulence. For specific turbulence strength, we optimized the sensor by adjusting the detector radius and the(More)
The need for n-times continuously differentiable trajectories arises when high speed, high precision control of dynamical systems is intended. Especially in mechanics, dynamical systems are usually limited in speed, acceleration and jerk. This paper introduces a strictly analytical method for generating C<sup>n</sup> trajectories along given points under(More)
The use of deformable mirrors (DMs) in adaptive optics (AO) systems allows for compensation of various external and internal optical disturbances during image aquisition. For example, an astronomical telescope equipped with a fast deformable secondary mirror can compensate for atmospheric disturbances and wind shake of the telescope structure resulting in(More)
In this paper, a novel method for designing a model-based two-degree-of-freedom control structure for high speed position control of large deformable mirrors with voice coil actuators is presented. Both global feedforward and glocal (decentralized accounting for global dynamics) feedback control is included allowing for separately designing tracking(More)
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