Ferrofluid Deformable Mirror With Non-Uniform Face Sheet
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Solution Overview
Problem
Existing deformable mirrors, such as segmented and continuous faceplate mirrors, suffer from coefficient of thermal expansion mismatch issues and 'quilting' effect distortions, while ferrofluid liquid mirrors lack a suitable reflective face sheet for dynamic platforms, limiting their performance.
Innovation Solution
A ferrofluid deformable mirror with a non-uniform thickness reflective face sheet and electromagnets to generate a magnetic field, which acts on the ferrofluid to deform the reflective face sheet, avoiding 'quilting' effects and enabling suitable performance on dynamic platforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If segmented mirrors or continuous faceplate mirrors with discrete actuators are used, then deformable mirror functionality is achieved, but coefficient of thermal expansion mismatch and quilting effect distortions occur
Solution Approach 1:
The patent replaces mechanical actuators with a magnetic field-based ferrofluid actuation system. Electromagnets generate magnetic fields that directly manipulate the ferrofluid to deform the mirror surface, eliminating mechanical contact and the associated thermal expansion mismatch and quilting effects between discrete actuators and the mirror faceplate.
Solution Approach 2:
The patent changes the physical state and properties of the mirror surface by using ferrofluid whose shape and position can be dynamically controlled through magnetic field parameters. By adjusting magnetic field strength and distribution, the mirror surface morphology is continuously variable without mechanical contact, resolving the thermal and precision contradictions.
2Manufacturing precision
If ferrofluid liquid mirrors are used, then quilting effects are avoided, but suitable reflective face sheet for dynamic platforms is lacking
Solution Approach 1:
The patent creates a composite structure combining a rigid reflective face sheet with a ferrofluid layer. The face sheet provides the necessary structural strength and stiffness for dynamic platforms, while the ferrofluid layer provides the deformable surface for wavefront correction. This composite approach integrates the advantages of both rigid and fluid materials.
Solution Approach 2:
The patent uses a thin reflective face sheet that is flexible enough to be deformed by magnetic field-induced ferrofluid pressure but rigid enough to maintain structural integrity. The face sheet acts as a flexible membrane that transmits the magnetic field forces from the ferrofluid to produce controlled surface deformations suitable for dynamic platforms.
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 provides improved stiffness and actuator stroke, minimizing wavefront error and gravity sag, allowing for effective correction of optical aberrations on dynamic platforms without 'quilting' distortions.
Implementation Method 1
one or more electromagnets about the reservoir operable to generate a magnetic field that acts on the ferrofluid to deform the reflective face sheet
Data Source
AI summary
A deformable mirror can include a reservoir containing a ferrofluid. The deformable mirror can also include a reflective face sheet covering a front side of the reservoir such that a back side of the reflective face sheet is exposed to the ferrofluid. The reflective face sheet can have a reflective surface on a front side of the reflective face sheet opposite the back side. The reflective face sheet can have a non-uniform thickness between the front and back sides of the reflective face sheet to provide stiffness for the reflective face sheet. In addition, the deformable mirror can include one or more electromagnets operable to generate a magnetic field that acts on the ferrofluid to deform the reflective face sheet. A deformable mirror system can further include a control system operably coupled to the one or more electromagnets to control the magnetic field and thereby a deformation of the reflective face sheet.