Bimetallic Mirror Mount for Thermal Focal Distance Compensation
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Solution Overview
Problem
Conventional mirror mounts for laser test platforms suffer from thermal expansion-induced stresses and distortions, leading to inaccurate focal distance changes and increased system mass and failure modes.
Innovation Solution
A compact modular mount using bimetallic rings with differing thermal expansion coefficients, comprising titanium and aluminum components, passively compensates for thermal expansion by employing bolt assemblies and spacers to maintain angular alignment and focal distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional mirror mounts are used for laser test platforms, then the system structure is simple, but thermal expansion induces stresses and distortions leading to inaccurate focal distance changes
Solution Approach 1:
The patent employs bimetallic rings composed of two materials with different coefficients of thermal expansion. When temperature changes occur, the rings expand or contract at different rates, automatically compensating for thermal distortion in the mirror mount and maintaining accurate focal distance without requiring complex active control systems
Solution Approach 2:
The invention uses composite bimetallic structures combining two materials with complementary thermal expansion properties. This composite approach allows the mount to passively counteract thermal effects through the inherent differential expansion of the materials, achieving precision without additional complexity
2Manufacturing precision
If conventional mirror mounts compensate for thermal expansion, then focal distance accuracy is maintained, but system mass increases
Solution Approach 1:
The bimetallic rings utilize passive thermal expansion compensation, where the differential expansion of two materials naturally counteracts thermal distortion. This eliminates the need for heavy active compensation mechanisms, motors, or sensors, thereby maintaining high precision while minimizing added mass
3Manufacturing precision
If conventional mirror mounts compensate for thermal expansion, then focal distance accuracy is maintained, but failure modes increase
Solution Approach 1:
The bimetallic rings provide self-compensating thermal expansion, where the system automatically adjusts for temperature changes without requiring external control systems. This passive mechanism eliminates failure modes associated with motors, sensors, and control electronics, thereby improving reliability while maintaining focal distance accuracy
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
Accurately maintains focal distance and reduces system mass and failure risks by passively counteracting thermal expansion, enhancing system lethality and reducing costs.
Implementation Method 1
The second material has a multi-factor higher coefficient of thermal expansion than the first material. As components receive ambient thermal and laser energy, heat absorption induces thermal expansion, which introduces stresses and distortions.
Data Source
AI summary
A compact modular mount is provided for mechanically compensating for focal distance change on a table due to thermal expansion. The mount includes first and second rings, a plurality of spacers and a plurality of bolts. The second material has a multi-factor higher coefficient of thermal expansion than the first material. Each of the first and second rings has a plurality of holes for receiving the bolts. The spacers each include symmetrically arranged plates hinging to adjacent segments. The bolts maintain angular alignment of the rings.