| Popis: |
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 λ/50(λ=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. |
