Aerodynamically Efficient Gradient Refractive Index Missile Seeker Lens.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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This thesis explores the use of a pointed seeker lens designed using a spherically symmetric gradient refractive index GRIN. The design helps to solve the current design conflict between optical quality and aerodynamic drag inherent in hemispherical seeker lenses. Equations for lens design and the evaluation of off-axis lens performance have been developed for both a homogeneous version an d a GRIN version of the pointed seeker lens. The homogeneous lens is used as a comparison and a check for the GRIN lens. A FORTRAN program GISL has been written and employed to evaluate and compare both the homogeneous lens and many different configurations of possible GRIN lens designs. Results indicate that the GRIN lens has highly superior off-axis imaging performance as compared to the homogeneous lens. The best results were obtained for the GRIN lens with a fifty percent, positive, spherically symmetric gradient index with center of symmetry interior to the lens. Only very slightly inferior performance was observed with a five percent version of the same lens such a lens possible can be manufactured today.
- Guided Missiles