Deformable Mirror with Ferrous Backing for Magnetic Actuation
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Solution Overview
Problem
Existing deformable mirrors face challenges in achieving sufficient actuator stroke and control while minimizing distortions and maintaining optical performance, especially in dynamic environments.
Innovation Solution
A deformable mirror system comprising a reflective face sheet with a non-uniform thickness and a compliant ferrous backing, actuated by electromagnets to generate a magnetic field that deforms the reflective face sheet, allowing for precise shape control and increased actuator stroke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a deformable mirror uses traditional actuation mechanisms, then the mirror can be deformed to correct wave front distortions, but the actuator stroke is limited and control precision is insufficient
Solution Approach 1:
The patent replaces traditional mechanical actuators (such as piezoelectric actuators or voice coil actuators) with a magnetic field-based actuation system. Electromagnets generate magnetic fields that interact with ferromagnetic particles embedded in the mirror substrate, enabling deformation without direct mechanical contact. This substitution eliminates mechanical constraints and friction, allowing for larger actuator stroke and improved control precision simultaneously.
Solution Approach 2:
The patent changes the physical state and distribution of ferromagnetic particles within the mirror substrate to enable controlled deformation. By adjusting the concentration, size, and spatial distribution of ferromagnetic particles, the mirror achieves variable stiffness and responsiveness to magnetic fields, thereby optimizing both actuator stroke and control precision for different operating conditions.
2Stability of the object's composition
If the mirror substrate is made thicker to increase stiffness, then structural stability improves, but the mirror becomes harder to deform and actuator effectiveness decreases
Solution Approach 1:
The patent employs a composite mirror substrate consisting of a rigid base material (such as glass or metal) embedded with ferromagnetic particles. The rigid base provides structural stability and stiffness, while the ferromagnetic particles enable magnetic actuation. This composite structure allows the mirror to maintain structural integrity while remaining deformable under magnetic field influence, resolving the contradiction between thickness/stability and deformability.
Solution Approach 2:
The patent implements non-uniform distribution of ferromagnetic particles within the mirror substrate, creating regions of varying magnetic responsiveness. Areas requiring greater deformation have higher concentrations of ferromagnetic particles, while areas requiring structural stability have lower concentrations. This local variation in material properties enables simultaneous optimization of structural stability and deformability across different regions of the 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 system achieves significant improvements in actuator stroke and control, enabling correction of larger wave front errors while reducing distortions and maintaining optical performance, even in tactical airborne environments.
Implementation Method 1
one or more electromagnets operable to generate a magnetic field that acts on the one or more ferrous materials to deform the reflective face sheet
Data Source
AI summary
A deformable mirror is provided that can include a mirror assembly having a reflective face sheet with a reflective surface on a front side of the reflective face sheet. The mirror assembly can also comprise one or more ferrous materials positioned within and making up or forming, in part, the mirror assembly. The deformable mirror can also include one or more electromagnets operable to generate a magnetic field that acts on the ferrous materials to deform the reflective face sheet.