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Optical distortion evaluation of an aerodynamically heated window, based on the higher-order singular value
Haosu Xiao1, Zhile Wang, Zhigang Fan
1Research Center for Space Optical Engineering, P.O. Box 307, Harbin Institute of Technology, Harbin 150001, China. haosuxiao@gmail.com
Abstract:
The higher-order singular value decomposition (HOSVD) was used to reconstruct the three-dimensional (3D) refractive index field of an aerodynamically heated window. The numerical 3D optical distortion was evaluated for both the reconstructed and the exact refractive index fields of the window, excluding the influence of the elasto-optical effect. The method based on the HOSVD truncation was shown to reduce the refractive index information required to capture the major optical distortion of the window. The refractive index information was reduced by reconstructing the refractive index field of the window using the truncated n-mode singular matrices. The method can also be used to evaluate the optical distortion of the window.
