Patent ID: 9658114
Date: 2017-05-23
CPC Classifications: G01J

Claim:
1. A device for measuring point diffraction interferometric wavefront aberration, comprising: an optical source, an optical splitter, a first light intensity and polarization regulator, a phase shifter, a second light intensity and polarization regulator, an ideal wavefront and point light source generator having a first input port, a second input port, an ideal wavefront output port, a point light source output, and an output numerical aperture, an object precision adjusting stage, a measured optical system, the measured optical system comprising an object plane, an object numerical aperture and an image point dispersion speckle, an image wavefront detection unit, said image wavefront detection unit comprising an image mask, a photoelectric sensor, and a support, the image mask comprising a transmittance band and a filtering circular hole, and the photoelectric sensor comprising a two-dimensional detector, an image precision adjusting stage, and a data processing unit, wherein the ideal wavefront and point light source generator is an optical component that transforms a light inputted from the first input port to a standard spherical wave in a scope of the object numerical aperture of the measured optical system that is subsequently outputted from the ideal wavefront output port, and transforms a light of the second input port to the point light source, the light is not an ideal spherical wave, and the output numerical aperture is equal to or greater than the object numerical aperture of the measured optical system, and the light is subsequently outputted from the point light source output port; a center distance (s the image mask is situated on the image plane of the measured optical system, the photoelectric sensor is arranged along the advancing direction of light and subsequent to the image mask, and the support is a mechanical component supporting the image mask and the photoelectric sensor; and the ideal wavefront output port is situated on the object plane of the measured optical system, and the point light source output port is situated on or is proximate to the object plane of the measured optical system.