Freeform Dome Correcting Lensing Aberrations
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Solution Overview
Problem
Existing optical domes used in devices like missiles and aircraft introduce significant lensing and aberration effects that complicate optical performance, and previous attempts to correct these issues have increased system complexity and cost without effective solutions.
Innovation Solution
The design of a dome with two separate curved surfaces, where the inside surface is engineered to counteract the lensing and aberration effects of the outside surface, by adjusting the radius of curvature to eliminate focal length and correct for aberrations, without requiring additional optical elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a simple hemispherical dome is used to protect optical components, then the dome provides protection, but it introduces lensing effects and optical aberrations that degrade optical performance
Solution Approach 1:
The patent applies asymmetry by designing the dome with non-spherical geometry. The dome surface is shaped according to specific mathematical equations (e.g., z = r²/(2R) + higher order terms) to create an asymmetric profile that compensates for optical aberrations. This asymmetric shaping allows the dome to correct its own optical distortions while maintaining protective function.
Solution Approach 2:
The patent changes the geometric parameters of the dome from a simple hemisphere to a complex freeform surface defined by multiple mathematical terms. By adjusting coefficients in the surface equation (e.g., varying the relative importance of different power terms), the dome's optical properties can be optimized to minimize aberrations while maintaining structural integrity.
2Manufacturing precision
If additional optical elements are added to correct dome aberrations, then optical performance improves, but system complexity and cost increase
Solution Approach 1:
The patent merges the protective function and optical correction function into a single integrated dome structure. Instead of adding separate correction elements, the dome itself is shaped to provide both protection and aberration correction simultaneously. This consolidation eliminates the need for additional optical components while maintaining optical performance.
Solution Approach 2:
The dome is designed to perform multiple functions: physical protection of optical components, optical correction of aberrations, and potentially aerodynamic flow management. This multi-functionality is achieved through the freeform surface geometry that simultaneously satisfies structural and optical requirements, reducing overall system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach simplifies manufacturing, reduces costs, and improves image quality by directly addressing dome-induced optical distortions without introducing new components or complexity, effectively mitigating lensing and aberration effects across various electromagnetic spectrum ranges.
Implementation Method 1
If the dome material has a refractive index of n, then at the center of the dome, its effective focal length is f=−nR(R−t)/[(n−1)t]
Data Source
AI summary
This application discloses an apparatus for minimizing the optical effects of transmissive domes, and for using the dome surfaces to correct for other optical aberrations and distortions. Herein, the inner surface of the dome is designed to correct for unwanted optical effects of the outer surface of the dome and may also be used to correct for other anticipated effects in the overall optical system.