Patent ID: 8786864
Filing Date: 2014-07-22
Classification: G01J

Abstract:
1. A circular common-path point diffraction interference wavefront sensor, comprising: an optical matching system, a beam-splitter, a first reflection mirror, a second reflection mirror, a first Fourier lens, a second Fourier lens, a charge-coupled device (CCD) detector, a computer system, and a two-pinhole mask having a reference pinhole and a testing window, wherein said two-pinhole mask is placed at a confocal plane of a telescope system consisting of said first Fourier lens and said second Fourier lens, wherein a testing beam from said optical matching system is divided into two beams, named transmitted beam and reflected beam through said beam-splitter, wherein said transmitted beam is reflected by said first reflection mirror, and then enters into said first Fourier lens and passes through said testing window of said two-pinhole mask at a focal plane of said first Fourier lens, and then enters into said second Fourier lens forming a reduced beam, said reduced beam is reflected by said second reflection mirror and then returns again to said beam-splitter as a signal wave, wherein said reflected beam is reflected by said second reflection mirror, and then enters into said second Fourier lens and makes a pinhole diffraction by said reference pinhole on said two-pinhole mask at said focal plane of said second Fourier lens, and then is expanded by said first Fourier lens, and then is reflected by said first reflection mirror, and then is reflected again by said beam-splitter as a reference wave, wherein said signal wave and said reference wave interfere at a superposition region thereof forming interference fringes.