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《Optical Technique》 2013-01
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Image processing of plasma interference fringes in air switch

ZHAO Qi1,2,XU Qifu1,LIU Lie1(1.College of Opto-Electronic Science and Engineering,National University of Defense Technology,Changsha 410073,China)(2.68127 Unit of People's Liberation Army,Lanzhou 730070,China)  
Mach-Zehnder interferometer is used to measure the electron density of plasma in air switch.Interference fringes are shoot by high speed framing camera.By research the feature of interferograms,an image processing method is given.Firstly,the interferograms are pretreated by a band-pass filter in Fourier-frequency domains.Secondly,the filtered interferograms are compressed in 2-gray level images.Thirdly,the 2-gray level images are thinned by Hilditch method;the center of the interference fringes is obtained.At last,Electron density of air switch plasma is obtained by operated inverse Abel transform on the fringes shift.
【Fund】: 国家自然科学基金项目(10975186)
【CateGory Index】: TP391.41
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