| The image quality measurement and evaluation of an optical system is needed during the manufacture and working process, to instruct fabricate and adjustment. In general, the image quality measurement methods of optical system are star testing, optical transform function testing, wavefront aberration testing and so on. This paper introduces phase retrieval technology to implement the quantificational wavefront aberration testing base on the conventional star testing theory.At first, on the basis of the fundament theory of information optics, the Fourier transform and an iterative is used to calculate and analyze the optical system star image(point spread function), to retrieve the phase of the pupil and image optical field and then unwrap to obtain the wavefront information. The Zernike aberration coefficients and Seidel aberration are got by fitting process of the wavefront.And then, make the phase retrieval simulation experiment. Retrieval the simple coma image and the image combined the coma, astigmation and defocus. For another associate the retrieval algorithm and ZEMAX software to retrieve the misalignment optical system star image.Finally, retrieve the lens image which collection by the phase retrieval experiment platform, compared the characters of retrieval result and objected image to evaluate the retrieval effect. The defocus images are retrieved thought the defocus phase retrieval algorithm. The availability of the algorithm has been confirmed by comparing the retrieval wavefront with the wavefront measured through phase-shifting interferometer.Moreover, the phase retrieval technology is used to measuring the pinhole diffraction wavefront. The microscope converge wavefront to get the diffraction image, the wavefront is retrieval from the image, and the relation between the aberrations and pinhole quality with illumination are analyzed. |
