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Radial shearing interferometer wavefront reconstruction algorithm

Author: JinYaFang
Tutor: HeYong
School: Nanjing University of Technology and Engineering
Course: Optical Engineering
Keywords: wavefront measurement radial shearing interference two-dimension Fourier transform wavefront reconstruction
CLC: TH744.3
Type: Master's thesis
Year: 2011
Downloads: 38
Quote: 1
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Abstract


In this dissertation, a research has been made on wavefront measurement based on radial shearing interference. Wavefront phase can be acquired from one single radial shearing interferogram using two-dimensional Fourier transform, and wavefront phase can retrieval by reconstruction iterative algorithm.The theory of two-dimensional Fourier transform is described, some issue is be detailed analysed, such as frequency mixing, selection filter, filter bandwidth, carrier frequency and phase unwrapping.According to the wavefront characteristics of radial shearing interferometry, wavefront iteration can be concluded. Wavefront reconstruction iterative algorithm with high precision is simulated different iterations, different radial shearing ratios and different wavefront distortions. It can provided the reference for optical design.Radial shearing interferometer analysis software is developed with VC++6.0 and other tools. There are some functions in radial shearing interferometer analysis software, such as image acquisition, phase extraction, wavefront iteration, and results display. Radial shearing interferometer analysis software has high accuracy, high processing speed and user friendly interface.Comparing radial shearing interferometer data with Zygo interferometer data, it is concluded that radial shearing interferometer system accuracy PV better thanλ/10.The appropriate number of interference fringes is selected with different radial shearing interferogram analysis. In order to test radial shearing interferometer analysis software, the measurement data with Zygo interferometer data comparing the measurement results can be obtained radial shearing interferometer. Wavefront reconstruction analysis software has a high reconstruction accuracy, data results is real and credible.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Optical instruments > Physical optical instruments > Interferometer
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