Image restoration and optical test by using Offner optical system
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摘要: 设计了一种Offner光学系统,用于基于相位差异技术的图像恢复和光学系统波像差的辅助检测。该Offner光学系统采用同轴抛物面反射镜作为Offner反射镜,以高速CCD相机和Shack-Hartmann波前探测器作为接收元件,能完好地消除复色光源在图像恢复过程中带来的色差;设计的RMS波像差小于/50(=632.8 nm),结构简单,容易实现。利用该系统分别以分辨率板和光纤光源为目标进行了图像恢复实验,经过恢复后的图像分辨率提高了19%。此外,利用该系统,采用相位差异算法解算了系统波像差,并与Shack-Hartmann波前探测器的测量结果进行了比较。比较显示两者的RMS波像差测量值相差5%,证明该系统同样能够进行光学波前检测。Abstract: Based on phase diversity technology, this paper designs an Offner optical system for image restoration and optical test of wavefront errors. The Offner optical system uses an on-axis parabolic mirror as Offner mirror, and a high speed CCD camera and a Shack-Hartmann wavefront sensor as the receivers to eliminate the chromatic aberration brought by the polychrome light source of the refractive system during image restoration. The system has a simple configuration with the wavefront error(RMS) less than /50(=632.8 nm). By using the system to perform image restoration experiment for a resolution plate and a fiber source, the resolution of restorated image is improved by 19%. In addition, wavefront error test are performed with the Offner optical system using the phase diversity algorithm, and the result demonstrates that the wavefront sensor difference between phase diversity and Shack-Hartmann is 5%, which proves that it is able to perform optical wavefront test with this Offner optical system.
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Key words:
- Offner system /
- optical design /
- image restoration /
- optical test /
- ground-based telescope
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