1. Temporal evolution of the optical path difference of a supersonic turbulent boundary layer
- Author
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Shihe Yi, Wen-Ke Xie, Zongfu Jiang, Qiong Gao, and Lin He
- Subjects
Physics ,business.industry ,Gaussian ,General Physics and Astronomy ,Interval (mathematics) ,Computational physics ,Boundary layer ,symbols.namesake ,Optics ,Point of delivery ,Planar ,Optical transfer function ,symbols ,Supersonic speed ,business ,Optical path length - 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 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.
- Published
- 2013