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The Optical Transmission Model Building and Emulation Through Plane-Window in Aero-Dynamic Thermal Environment

Author: ZhangJun
Tutor: ZhangAiHong´╝ŤFanZhiGang
School: Harbin Institute of Technology
Course: Optical Engineering
Keywords: Aero-optics Plane window Raytrace Image quality evaluation
CLC: TP391.41
Type: Master's thesis
Year: 2007
Downloads: 168
Quote: 1
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Aircraft detection systems with optical imaging high-speed flight within the atmosphere , the occurrence of violent interactions between the plane window and Atmospheric severe aero-optic effects . Window in aerodynamic heating environment lead to changes in the shape and optical properties of window materials due to the effect of heat conduction and thermal stress , the originally uniform optical characteristics of the window shape distortion , and the formation of internal refractive index gradient distribution . When a plane wave incident to the distortion window exit after the other optical drive wave surface deviation from the ideal wave surface wavefront occurrence of distortion , thereby through the window of the target light generated offset , blur , etc. , decline in image quality , the severe impact of the guidance precision . The main subject of tracing by ray method to study the shape aerodynamic heating environment , the refractive index of the uneven distribution of optical window target imaging beam . Calculating the optical evaluation of the window function (mainly including PSF, MTF, the distorted image , energy concentration chart , the wave front differential wavefront tilt amount , Strehl ratio ) . First pixel matching theory is applied to the evaluation of the optical system , has a certain reference value for the study of aero-optical image restoration work . First, starting from the angle of the ray tracing using computer 3D processing method and optical design method of combining tracing rays wave surface of each point of the optical path through the window to reach a predetermined plane , and compiled in Visual C 6.0 environment corresponding ray tracing program , reveal aero-optical effect , the study aero-optical authentication method provides a reference . Window and then calculate the point spread function , transfer function , the energy is concentrated and Strehl ratio system evaluation ; proposed two solutions pixel matching algorithm , and compare these two algorithms , paper selection algorithm 2 for the first algorithm . Paper for the first time by the analysis of simulation results , summarizes a number of factors affect the image distortion ; one example of a system and create a validation method can run through the verification process results that establish the aerodynamic heating environment : this topic the finite element model of the optical window space and the corresponding image quality evaluation algorithm is feasible, and the results obtained can be used for experimental studies in practical engineering .

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