Deformable Mirror Actuation via Patterned Electrodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current deformable mirrors for telescopes are heavy, expensive, and difficult to manufacture, with limitations in shape accuracy and actuation range, making them unsuitable for large-scale, lightweight, and cost-effective applications in space-based observatories.
Innovation Solution
A method and structure for a deformable mirror that involves designing a pattern and shape of electrodes on a composite shell with active material, allowing optimal correction of error modes through electric biases, using a nanolaminate to reduce print-through and incorporating a flexible electrode routing layer for efficient actuation, enabling lightweight and cost-effective large-aperture mirrors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional deformable mirrors are used, then shape correction capability is achieved, but weight and manufacturing cost increase significantly
Solution Approach 1:
The patent employs composite materials including carbon fiber reinforced polymer (CFRP) substrates, piezoelectric ceramic layers (PZT), and nanolaminate facesheets to create a lightweight yet structurally sound deformable mirror. This composite construction reduces weight while maintaining the necessary shape correction capabilities through the piezoelectric actuation mechanism.
Solution Approach 2:
The patent utilizes thin film structures, including a 50-micron thick nanolaminate facesheet and flexible piezoelectric layers, to create a deformable mirror that can achieve precise shape control with minimal mass. The thin film construction enables flexibility and actuation while significantly reducing weight compared to traditional solid mirrors.
2Manufacturing precision
If traditional deformable mirrors are used, then shape correction capability is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent incorporates shape correction capabilities directly into the manufacturing process by bonding piezoelectric layers and electrode patterns to the mirror substrate during fabrication. This preliminary integration of actuation mechanisms eliminates the need for complex post-manufacturing assembly and reduces overall manufacturing complexity.
Solution Approach 2:
The deformable mirror structure is designed to perform multiple functions: the nanolaminate facesheet provides both the optical surface and structural support, while the integrated piezoelectric layers and electrode patterns provide both actuation and shape control. This multi-functionality reduces the number of separate components and simplifies manufacturing.
3Weight of moving object
If ultra-thin mirror structures are used, then weight is reduced, but actuation range and shape accuracy are limited
Solution Approach 1:
The patent uses composite materials with high stiffness-to-weight ratios, including carbon fiber reinforced polymer substrates and nanolaminate facesheets, to provide sufficient structural support and shape accuracy in ultra-thin mirror structures. The piezoelectric ceramic layers add actuation capability while maintaining the lightweight characteristic.
Solution Approach 2:
The patent achieves adequate actuation range in ultra-thin structures by optimizing the thickness and material properties of the piezoelectric layers. By carefully selecting the piezoelectric material constants and layer thickness, the design achieves sufficient shape change capability while maintaining the ultra-thin, lightweight structure.
4Manufacturing precision
If complex electrode patterns are used, then shape correction precision is improved, but device complexity increases
Solution Approach 1:
The patent implements local quality by varying the electrode pattern density and configuration in different regions of the mirror. Areas requiring higher shape correction precision have more detailed electrode patterns, while other regions use simpler patterns. This localized optimization achieves high overall precision without uniformly increasing device complexity across the entire mirror.
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 solution drastically reduces the mass and cost of telescopes while providing sufficient shape correction capability, allowing for the use of identical spherical mirror segments and active compensation for thermal effects, creep, and aging of mirror materials.
Implementation Method 1
one or more active layers (e.g., PZT, piezoelectric or electrorestrictive) between the common electrode and the patterned electrodes, the active layers changing shape in response to one or more electric fields applied between the patterned electrodes and the common electrode
Data Source
AI summary
A method and apparatus for correcting error modes of a deformable mirror, including selecting or targeting one or more target error modes of a deformable mirror; and designing a pattern and/or shape of one or more electrodes, wherein the pattern and/or shape of the electrodes are designed to optimally correct the target error modes when the electrodes are disposed on the deformable mirror via an active material. Also disclosed is a deformable structure, including a composite shell including a plurality of plies each including carbon fibers embedded in a resin; a nanolaminate comprising individual nanolayers attached to a first side of the composite shell; an actuation structure attached to a second side of the composite shell; and a flexible electrode routing layer attached to the actuation structure.