研究目的
To improve the correction capability of wavefront sensorless adaptive optics (WFSless AO) system for extended object images degraded by aberration by presenting a method based on local region abstraction (LRA).
研究成果
A method based on local region abstraction images is presented by analyzing the essential and similarity of the deconvolution optimizations, and the aberrations correction with WFSless AO systems. In restoration images degraded by static aberrations, the speed of restorations with WFSless AO system using LRA images is enhanced by 8–20 times. The corresponding correction speed in dynamics aberrations experiment is improved by about 3.5 times. It could be enhanced greatly by subsequent optimizations.
研究不足
The correction speed of WFSless AO system is limited owing to the large sized image and low frame rate of camera. The tradeoff between the enhancement of camera’s frame rate due to small LRA images and the degradation of estimation PSF of small size LRA image must be considered seriously.
1：Experimental Design and Method Selection:
The method is based on local region abstraction (LRA) according to the sparse characteristics of extended object imaging. SPGD algorithm with LRA images of the extended object is adopted in WFSless AO system.
2：Sample Selection and Data Sources:
The experiment system for image restoration with WFSless AO system is set up, including an extended light source, an extended target (USAF1951), an optical beam shrinker, a tilt/tip mirrors (TM), a deformable mirror (DM), a computer control system, and a combination sensor.
3：List of Experimental Equipment and Materials:
The combination sensor consists of a Shack-Hartmann sensor, a near-field detection camera, and a far-field measurement camera.
4：Experimental Procedures and Operational Workflow:
The images are degraded by the distortions of the aberration plate and system’s initial aberrations. These aberrations are compensated by DM according to the driver voltages generated during the iterations of control algorithm to optimizing the LRA images.
5：Data Analysis Methods:
The image sharpness and gradient of images restored with WFSless AO system using LRA1 image and LRA6 image respectively under the dynamical aberrations are calculated from the full view-field images sampled by camera CCD1 during more than 100 seconds.
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