Renault speeds up delivery with a new dss

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Renault speeds up delivery with a new dss

Mechanical constraints in a deformable mirror DM are one of the primary constraints that limits the capability of an adaptive optics AO system. Current technology will operate the DM within the regime that is limited by this physical constraint in order to prevent any mechanical failure from occurring.

Such mechanical constraints include, but are not limited to inter-actuator stroke limits and mirror resonance modes. The first issue is due to the mechanical constraints of a point-actuated deformable mirror DM with continuous facesheets from which each point-actuator is limited in its range of stroke [1],[2].

Aside my from the fact that this limits the maximum From a control algorithm perspective, the stroke limit is effectively viewed as a nonlinear saturation limit that can potentially induce instability.

Adaptive optics AO through DM implementation offers a more challenging problem as the stroke limits for each point actuator depends on the relative position of the neighboring actuators that change every time step. In other words, due to spatial coupling of the facesheet, the so-called inter-actuator stroke limit effectively imposes point-in-time saturation limits to each actuator [4], which manifests the complexity of the MIMO control problem.

The secondary constraint of interest is the DM resonance mode that is an inherent structural property associated with the mirror itself.

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The current state-of-the-art AO technology chooses to limit the control bandwidth so it does not excite these modes. The multi-channel nature of the device makes a standard notch filter a less viable option and calls for a MIMO controller that can account for the spatial and temporal dependencies of the mirror modes.

The research problem here is to design a control algorithm that operates beyond the physical limits to provide sufficient AO bandwidth BW when addressing aero-optical effects while maintaining mechanical and control stability.

Requirements for this research effort can be made by first establishing a baseline case where an AO simulation is conducted without any DM inter-actuator stroke limits. The limiting factor for performance is frame rate, open-loop BW for DM, severity of the disturbance source, and the closed-loop BW of the control algorithm.

Candidate performance metrics are wavefront error WFEStrehl, peak irradiance, and power-in-the-bucket. The baseline case isolates that inter-actuator stroke limit problem from the AO simulation, and shows the best achievable performance.

Although not completely necessary, it is good to show performance contrast by implementing the same controller in the presence of inter-actuator stroke-limits. It is highly anticipated that the performance metrics would show significant degradation. The SBIR awardee would address this issue with a novel control scheme that maximizes control BW and avoids instability.

Develop a new control algorithm operate in frequency range beyond the physical constraints of the deformable mirror DM while maintaining mechanical and control stability. A basic wave-optics model or two-step Discrete Fourier Transform method is necessary for making numerical far-field predictions while implementing the AO-loop.

Assume that the AO beacon is a perfect point source with no camera noise. Using the new control algorithm to numerically quantify how degraders due to inter-actuator stroke limits and mirror resonance modes can be mitigated within a closed-loop AO system for a particular disturbance environment, namely in the presence of aero-optics.

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Incorporating inter-actuator stroke limit capability increasing the fidelity of the physical DM model into high fidelity beam-control-suitable wave-optic code. Implementing the new control algorithm with the increased fidelity wave-optics code under relevant air-to-air HEL engagement conditions such as the use of a non-cooperative beacon illuminator, camera noise, and speckle.

Renault speeds up delivery with a new dss

Implementing the new control algorithm on a Government provided aero-optic beam control testbed to verify modeling and simulation results. Incorporating the new control algorithm and inter-actuator limit module into commercially available software packages.

Other commercial applications include the development of adaptive optics for biomedical microscopy which can use this technique for simulated imagery.Marketing Mix.

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