Composite Monolithic Telescope for Low-Mass Aperture Scaling
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Solution Overview
Problem
Optical systems for space and airborne applications face challenges in maintaining alignment and are susceptible to damage during launch due to significant shock and vibration, with conventional systems requiring complex mechanical alignment structures and high mass scaling with aperture size.
Innovation Solution
A composite monolithic telescope design integrates a primary and tertiary mirror in static alignment, incorporating a secondary mirror displaced away from the monolithic assembly, which is configured to maintain low alignment sensitivity and reduce mass scaling, using a folded Gregorian-like design with a quasi-flat secondary mirror and integrated field correcting lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional optical systems use separate mirror assemblies with mechanical alignment structures, then alignment precision can be maintained, but device complexity and mass increase significantly
Solution Approach 1:
The patent merges the primary and tertiary mirrors into a single monolithic assembly, eliminating the need for separate mirror assemblies and their associated mechanical alignment structures. This integration maintains alignment precision by fixing the relative positions of the mirrors while reducing overall system complexity
Solution Approach 2:
The secondary mirror is extracted from the monolithic assembly and positioned separately, allowing it to be optimized independently with low power curvature and weak fourth order shape to minimize alignment sensitivity while the primary and tertiary mirrors remain integrated
2Manufacturing precision
If monolithic telescope aperture size is increased, then optical performance improves, but mass increases with the cube of aperture size
Solution Approach 1:
The telescope is segmented into a monolithic assembly containing the primary and tertiary mirrors, with the secondary mirror positioned separately. This segmentation allows the heavy monolithic component to be optimized for structural efficiency while the secondary mirror is minimized in mass through its low power curvature design
Solution Approach 2:
The secondary mirror uses low power curvature and weak fourth order shape parameters to reduce its mass while maintaining optical functionality. This parameter optimization allows aperture scaling without proportional mass increase
3Stability of the object's composition
If optical components are rigidly fixed to maintain alignment, then alignment stability is improved, but sensitivity to shock and vibration increases
Solution Approach 1:
The secondary mirror is extracted from the monolithic assembly and positioned separately with independent mounting, isolating it from shock and vibration transmitted through the monolithic structure. This separate positioning reduces the transmission of harmful mechanical forces while maintaining alignment stability
Solution Approach 2:
The monolithic assembly acts as an intermediary that provides stable alignment for the primary and tertiary mirrors while the separate secondary mirror positioning serves as a buffer against shock and vibration, mediating between structural stability and shock resistance
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
The design allows for aperture scaling beyond half-meter sizes without significant mass increase, providing robust alignment tolerance and reduced sensitivity to misalignments, thus reducing mechanical complexity and costs while maintaining optical performance.
Implementation Method 1
a secondary mirror or fold mirror that is displaced away from the monolithic mirror assembly and has a reflective mirror surface. The secondary (or fold) mirror's reflective mirror surface is positioned to direct light received from the primary mirror onto the tertiary mirror and direct light received from the tertiary mirror onto a detector
Data Source
AI summary
Disclosed embodiments enable scaling of monolithic optical systems (e.g., monolith telescopes) up to larger aperture sizes while reducing mass scaling. An example optical system includes a monolithic mirror assembly that integrates a primary mirror and a tertiary mirror in static alignment. The optical system further includes a secondary mirror or fold mirror displaced away from the monolithic mirror assembly and having a reflective mirror surface. The secondary mirror's reflective mirror surface is positioned to direct light received from the primary mirror onto the tertiary mirror and direct light received from the tertiary mirror onto a detector. The secondary mirror is particularly configured to maintain a low alignment sensitivity, consistent with the permanent fixed alignment associated with the monolithic mirror assembly. For example, the secondary mirror has a relatively low power curvature and a weak fourth-order shape insensitive to decentering and tip/tilt misalignments when directing light onto the spherical tertiary mirror.