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

被引：8

作者：

Gao Qiong ^{[1
]}

Yi Shi-He ^{[2
]}

Jiang Zong-Fu ^{[1
]}

He Lin ^{[2
]}

Xie Wen-Ke ^{[1
]}

机构：

[1] Natl Univ Def Technol, Coll Photon Electron Sci & Engn, Changsha 410073, Hunan, Peoples R China

[2] Natl Univ Def Technol, Coll Aerosp & Mat Engn, Changsha 410073, Hunan, Peoples R China

来源：

CHINESE PHYSICS B | 2013年 / 22卷 / 01期

基金：

中国国家自然科学基金;

关键词：

aero-optics; supersonic turbulent boundary layer; optical transfer function; NPLS;

D O I：

10.1088/1674-1056/22/1/014202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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 short-exposure optical transfer function.

引用

页数：6

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