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Chin. Phys. B, 2013, Vol. 22(1): 014202    DOI: 10.1088/1674-1056/22/1/014202
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

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

Gao Qiong (高穹)a, Yi Shi-He (易仕和)b, Jiang Zong-Fu (姜宗福)a, He Lin (何霖)b, Xie Wen-Ke (谢文科)a
a College of Photon-electron Science and Engineering, National University of Defense Technology, Changsha 410073, China;
b College of Aerospace and Material Engineering, National University of Defense Technology, Changsha 410073, China
Abstract  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 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.
Keywords:  aero-optics      supersonic turbulent boundary layer      optical transfer function  
Received:  13 June 2012      Revised:  04 September 2012      Accepted manuscript online: 
PACS:  42.25.Dd (Wave propagation in random media)  
  47.40.Ki (Supersonic and hypersonic flows)  
Fund: Project supported by the Innovation Research Foundations for Postgraduates of National University of Defense Technology and Hunan Province, China and the National Natural Science Foundation of China (Grant No. 61008037).
Corresponding Authors:  Gao Qiong     E-mail:  gaoqiong1980@126.com

Cite this article: 

Gao Qiong (高穹), Yi Shi-He (易仕和), Jiang Zong-Fu (姜宗福), He Lin (何霖), Xie Wen-Ke (谢文科) Temporal evolution of optical path difference of a supersonic turbulent boundary layer 2013 Chin. Phys. B 22 014202

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