Research on displacement information extraction from Michelson interference fringes

Home > Archive>Volume 44, Issue 5, 2021 >51-54

Research on displacement information extraction from Michelson interference fringes
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                        Li ZhongmingLi Zhongming
1 Changchun Institute of Optics, Fine Mechanics and physics, Chinese Academy of Science, Changchun 130033, China; 2 University of Chinese Academy of Science, Beijing 100049, China
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Tang YanfuTang Yanfu
Changchun Institute of Optics, Fine Mechanics and physics, Chinese Academy of Science, Changchun 130033, China
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Li JunlinLi Junlin
Changchun Institute of Optics, Fine Mechanics and physics, Chinese Academy of Science, Changchun 130033, China
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Yang YongqiangYang Yongqiang
1 Changchun Institute of Optics, Fine Mechanics and physics, Chinese Academy of Science, Changchun 130033, China; 2 University of Chinese Academy of Science, Beijing 100049, China
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Li HongyuLi Hongyu
Changchun Institute of Optics, Fine Mechanics and physics, Chinese Academy of Science, Changchun 130033, China
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Affiliation:1 Changchun Institute of Optics, Fine Mechanics and physics, Chinese Academy of Science, Changchun 130033, China; 2 University of Chinese Academy of Science, Beijing 100049, China
Clc Number:TP274+.5
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Abstract:

Based on Michelson interference, we propose a micro-displacement information extraction method using imaging principle and image processing. The processing object of the method is equal inclination fringes collected by planar-array CCD camera. The image preprocessing for each frame includes denoising, top-hat transformation, binarization, morphology operations. Then radius of the bright interference fringe at the center of the image is obtained by feature recognition. By comparing the change trend and amplitude of the radius of frame sequence, the method realizes displacement information extraction. Experiments show that detection resolution of the method is λ/4 by making use of the information provided by every frame, which is superior to the maximum resolution of λ/2 of the detection by interference fringe counting .

Key words:Michelson interference; information extraction; image preprocessing; feature recognition

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Online: October 24,2024
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