A5015838624- Adaptive optics and wavefront sensing
- Optical Systems and Laser Technology
- Image and Video Stabilization
- Optical Coherence Tomography Applications
- Optical Network Technologies
- Advanced Measurement and Metrology Techniques
- Glaucoma and retinal disorders
- Advanced optical system design
- Optical Wireless Communication Technologies
- Optical measurement and interference techniques
- Image Processing Techniques and Applications
- Adaptive Control of Nonlinear Systems
Chinese Academy of Sciences
2022-2024
University of Chinese Academy of Sciences
2022-2024
Institute of Optics and Electronics, Chinese Academy of Sciences
2022-2024
Optical mirror misalignments, which are caused by assembly mistakes and changes in the surrounding environment (such as gravity, temperature, atmosphere), degrade system’s imaging performance. Therefore, active misalignment correction is essential for ensuring image quality of off-axis telescope. In this paper, a novel method without wavefront sensors proposed. The point spread functions (PSFs) system analytically related to optical misalignments. On basis, fully connected neural network...
At present, the majority of sparse-aperture telescopes (SATs) are unable to observe moving targets. In this paper, we describe construction and present results obtained using a Fizeau directly-imaging telescope (FDISAT) that permits pointing tracking The comprises three sub-apertures, each which is equipped with Risley prism system maximum range 5° has independent boresight adjustment capability. On targets in various positions, experiments conducted. root-mean-square error (RMSE)...
Vibration rejection is one of the key techniques to stabilize line sight (LOS) for phased array telescope systems. Conventionally, feedback control based on image sensors mainly used correct tip/tilt errors caused by disturbances and keep LOS stable. However, it restricted sampling rate time delay sensors, leading a limited closed-loop bandwidth. Disturbances in middle high frequencies are hard suppress. In this paper, disturbance-propagation-characteristics-based feedforward proposed...
In this paper, a robust control based on disturbance observer is proposed to improve the tracking accuracy of Risley prism system (RPS). Applying flexible thin-wall ring mechanism in RPS causes series and pointing challenges. Disturbances such as friction, shaft deformation, model perturbation significantly deteriorate RPS. Two different observer-based methods are guarantee precision Moreover, observation compensation (DOC) performance analyzed compared. Finally, simulation experiment...
In the adaptive optics system of astronomical observation, deformable mirror and tip/tilt are coupled during correction process. However, due to limited sensitivity Shack-Hartmann wavefront sensor in detecting piston aberration, it becomes necessary constrain aberration caused by mirror. This paper introduces a straightforward efficient decoupling control algorithm that is based on mode-voltage constraints. The proposed utilizes mode method decompose voltage mode, constructs transition...