Metering Shell Projections for Atomic Oxygen Mirror Protection
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Solution Overview
Problem
Existing methods to mitigate atomic oxygen (AO) degradation in spacecraft components, such as mirrors and lenses, are inadequate due to adherence issues and contamination from protective coatings, which are also susceptible to space radiation degradation.
Innovation Solution
Implementing geometrically designed projections on the interior surface of a tubular metering shell to deflect AO atoms away from sensitive surfaces by optimizing their angles and spacing to maximize deflection and minimize impact on the protected surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If protective AO-resistant coatings are applied to exposed sensitive surfaces, then protection against atomic oxygen degradation is improved, but contamination of optical properties and long term adherence issues occur
Solution Approach 1:
The patent removes the harmful protective coating layer entirely and replaces it with a geometric projection structure that physically deflects atomic oxygen away from the optical surface, eliminating coating-related contamination and adherence problems while maintaining protection
Solution Approach 2:
The geometric projections act as an intermediary structure between the atomic oxygen environment and the optical surface, deflecting AO atoms away from the mirror before they can cause degradation, without requiring direct contact with the optical coating
2Object-affected harmful factors
If carbon nanostructures are used to absorb AO, then protection against atomic oxygen is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent uses simple geometric projections made from conventional materials that can be easily manufactured and replaced if needed, replacing complex carbon nanostructure systems with simpler, more manufacturable components
Solution Approach 2:
The patent replaces the chemical absorption mechanism of carbon nanostructures with a mechanical deflection system using geometric projections, simplifying the protection mechanism while maintaining effectiveness
3Object-affected harmful factors
If coatings are applied to protect optical surfaces, then AO resistance is improved, but degradation due to space radiation over time occurs
Solution Approach 1:
The patent eliminates the vulnerable coating layer that degrades under space radiation and replaces it with a radiation-hard geometric projection structure that provides long-term protection without suffering from radiation-induced degradation
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
Effectively reduces AO damage to optical components by redirecting atoms away from the mirror surface, enhancing long-term protection without the need for coatings, thus maintaining optical integrity and reducing contamination risks.
Implementation Method 1
AO deflects from (i.e., bounces off) surfaces in a determinable manner that is, at least partially, dependent on the surface material
Data Source
AI summary
Mitigation of erosive effects of atomic oxygen encountered by telescope systems deployed in low earth orbit (LEO is effected by providing an array of multiple very small projections on the interior surface of an open-ended tubular metering shell extending forwardly from a mirror to be protected. The projections are made of material that is geometrically configured to deflect AO atoms one or more times within the shell at angles that ultimately direct the atoms away from the mirror surface and back out through the forward end of the shell.