Temporal evolution of optical path difference of a supersonic turbulent boundary layer |
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Authors: | Gao Qiong Yi Shi-He Jiang Zong-Fu He Lin Xie Wen-Ke |
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Affiliation: | 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 |
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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. |
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Keywords: | aero-optics supersonic turbulent boundary layer optical transfer function |
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