Fiber Micropositioner With Opposed Flexures For Thermal Management
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Solution Overview
Problem
Existing mechanisms for precisely controlling the pointing of a laser beam in systems like laser communication systems face challenges due to thermal isolation issues, material fatigue, and limited range of motion, which affect accuracy and system longevity.
Innovation Solution
A micropositioner system with a suspension structure using opposed flexures and actuators mounted to a base for precise movement in two dimensions while preventing movement in the third dimension, incorporating heat transfer for thermal management and using metallic materials for durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If actuators are thermally isolated from the base, then the fiber positioning mechanism can be compact, but the actuators cannot be adequately cooled leading to temperature variations that affect pointing accuracy
Solution Approach 1:
The support structure is segmented into multiple components including a base, suspension structure, and actuator mounting structure. This segmentation allows the actuators to be thermally coupled to the base through the suspension structure, providing a dedicated thermal pathway that separates thermal management from mechanical positioning functions.
Solution Approach 2:
The suspension structure acts as an intermediary element between the actuators and the base. It provides both mechanical support for positioning and thermal conduction pathway, mediating between the mechanical positioning function and thermal management requirements.
2Manufacturing precision
If a rigid support structure is used to prevent movement in all dimensions, then positioning precision is improved, but the range of motion is limited
Solution Approach 1:
The support structure transitions from a completely rigid configuration to a dynamic configuration with controlled degrees of freedom. The suspension structure with flexures allows motion in the x-y plane while maintaining rigidity in the z-direction, adapting the structural properties to match the functional requirements of different dimensions.
Solution Approach 2:
The problem of constraining motion is solved by considering dimensional independence. The structure allows two-dimensional motion (x-y plane) while constraining the third dimension (z-axis), using the orthogonality of dimensions to separate positioning freedom from stability requirements.
3Adaptability or versatility
If materials with high flexibility are used to increase range of motion, then adaptability is improved, but material fatigue increases reducing system life
Solution Approach 1:
The flexure parameters (geometry, thickness, material properties) are optimized to achieve the desired range of motion while staying within elastic limits. By carefully controlling the flexure dimensions and material selection, the system achieves adequate motion capability while preventing fatigue-induced failure.
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 enables precise and stable pointing of a laser beam with improved thermal management and extended lifespan, supporting high-frequency operations and a wide range of motion, suitable for applications like beam scanning and satellite communications.
Implementation Method 1
The first and second flexures are opposed to one another and are aligned along a third dimension that is orthogonal to the first and second dimensions, to counteract movement of the support element in the third dimension
Implementation Method 2
the actuators are fixed to a base unit, providing favorable heat transfer characteristics
Data Source
AI summary
A micropositioner is provided. The micropositioner can include a suspension system with a support element that is connected to a base by first and second sets of flexures. The first and second sets of flexures permit movement of the support element within first and second dimensions respectively, while preventing movement of the support element in a third dimension that is orthogonal to the first and second dimensions. More particularly, the first set of flexures can include first and second flexures that are opposite one another and configured such that movement of the support element in the first dimension is allowed, but movement of the support element in the second and third dimensions is prevented. The second set of flexures can include third and fourth flexures that are opposite to one another and configured such that movement of the support element in the second dimension is allowed, but movement in the first and third dimensions is prevented. The micropositioner may be included in a system for pointing a laser beam.