摘要
利用Mach-Zehnder干涉仪测量了空气开关中等离子体电子密度分布,使用高速分幅相机拍摄记录不同时延下的干涉条纹图像。针对实验获得的干涉条纹图像的特点,提出了一种首先进行频域FFT滤波去噪,然后进行空域二值化、细化的处理方法。该方法能够很好的消除图像噪声的影响,提取出单像素的亮条纹中心线,从而能够准确读取条纹坐标信息,再通过对干涉条纹偏移量进行Abel逆变换,得到等离子体电子密度分布。
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.
出处
《光学技术》
CAS
CSCD
北大核心
2013年第1期37-40,共4页
Optical Technique
基金
国家自然科学基金项目(10975186)
关键词
干涉测量
开关等离子体
图像处理
Abel逆变换
laser interferometry
switch plasma
image processing
inverse Abel transformation
