Temporal evolution of the optical path difference of a supersonic turbulent boundary layer  

作　　者：高穹 易仕和 姜宗福 何霖 谢文科 

机构地区：[1]College of Photon-electron Science and Engineering, National University of Defense Technology [2]College of Aerospace and Material Engineering, National University of Defense Technology

出　　处：《Chinese Physics B》2013年第1期231-236,共6页中国物理B（英文版）

基　　金：Project supported by the Innovation Research Foundations for Postgraduates of National University of Defense Technology and Hunan Province, China;the National Natural Science Foundation of China (Grant No. 61008037)

摘　　要：The density distribution of a supersonic turbulent boundary layer is measured with the nanoparticle-based planar laser scattering technique, and the temporal evolution of its optical path difference （OPD） in a short time interval is characterized by proper orthogonal decomposition （POD）. Based on the advantage of POD in capturing the energy of a signal, a temporal evolution model is suggested for the POD coefficients of the OPD. In this model, the first few coefficients vary linearly with time, and the others are modeled by Gaussian statistics. As an application, this method is used to compute the shortexposure optical transfer function.The density distribution of a supersonic turbulent boundary layer is measured with the nanoparticle-based planar laser scattering technique, and the temporal evolution of its optical path difference （OPD） in a short time interval is characterized by proper orthogonal decomposition （POD）. Based on the advantage of POD in capturing the energy of a signal, a temporal evolution model is suggested for the POD coefficients of the OPD. In this model, the first few coefficients vary linearly with time, and the others are modeled by Gaussian statistics. As an application, this method is used to compute the shortexposure optical transfer function.

关 键 词：AERO-OPTICS supersonic turbulent boundary layer optical transfer function 

分 类 号：V241[航空宇航科学与技术—飞行器设计]