Flat Spring Interferometer Maintaining Optical Alignment
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Solution Overview
Problem
Michelson interferometers face significant challenges with optical instability and misalignment due to mechanical, acoustic, and thermal disturbances, leading to compromised performance and the need for frequent realignment, which is inconvenient and costly.
Innovation Solution
A compact and portable interferometer system is designed with a fixed and movable assembly connected by flat springs, maintaining optical relationships independent of distance, using a motor coil for movement and steel or titanium components to minimize thermal expansion differences, ensuring stable alignment without additional expensive optical elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If significant mass and thermal capacity are used to reduce misalignment effects, then optical stability is improved, but portability and ease of movement deteriorate
Solution Approach 1:
The patent changes the physical parameters of the spring elements (material composition, thickness, length) to achieve optimal balance between mechanical support and thermal isolation. By carefully selecting spring parameters, the system achieves adequate alignment maintenance without requiring massive structures, enabling portability while maintaining optical stability.
Solution Approach 2:
The patent employs composite material strategies by combining materials with different thermal properties in the spring elements and structural components. This allows the system to achieve both mechanical rigidity for alignment maintenance and thermal isolation to prevent distortion, resolving the contradiction between stability and portability.
2Reliability
If additional optical elements and structure are added to maintain alignment, then alignment stability is improved, but device complexity and compactness deteriorate
Solution Approach 1:
The patent extracts and eliminates unnecessary optical elements from the system. By using simple spring-supported mirror mounts instead of complex alignment mechanisms, additional optical components, or active stabilization systems, the design achieves alignment stability through mechanical simplicity rather than optical complexity.
Solution Approach 2:
The spring elements provide self-aligning functionality through their elastic properties. The mirrors automatically maintain proper orientation relative to the beam splitter through the mechanical constraints imposed by the springs, eliminating the need for additional alignment mechanisms or complex control systems.
3Manufacturing precision
If periodic realignment is performed using automatic alignment algorithms and precision stepper motors, then alignment accuracy is improved, but user convenience and cost deteriorate
Solution Approach 1:
The patent replaces complex mechanical alignment systems (stepper motors, alignment algorithms, adjustment mechanisms) with a passive mechanical spring support system. The springs provide continuous alignment maintenance through their elastic constraints, eliminating the need for active realignment mechanisms and associated control systems.
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 substantially permanent alignment and improved optical stability across a wide temperature range, reducing the need for frequent realignment and minimizing costs associated with maintaining alignment.
Implementation Method 1
A first flat spring has an opening for providing an unobstructed optical path of radiation therethrough. A first end of the first flat spring is secured to the fixed assembly and a second end of the first flat spring is secured to the movable assembly for providing movement of the movable assembly relative to the fixed assembly via the first flat spring.
Implementation Method 2
A movable assembly includes a housing, a mirror, and a motor coil, fixedly positioned relative to each other.
Implementation Method 3
using a motor coil for movement and steel or titanium components to minimize thermal expansion differences
Data Source
AI summary
An interferometer for Fourier transform infrared spectroscopy includes a fixed assembly including a housing, a beam splitter, and a mirror fixedly positioned relative to each other. A movable assembly includes a housing, a mirror, and a motor coil, fixedly positioned relative to each other. A first flat spring has an opening for providing an unobstructed optical path of radiation therethrough. A first end of the first flat spring is secured to the fixed assembly and a second end of the first flat spring is secured to the movable assembly for providing movement of the movable assembly relative to the fixed assembly via the first flat spring. An optical relationship between the beam splitter, the mirror of the fixed assembly, and the mirror of the movable assembly is maintained independent of a distance between the movable assembly and the fixed assembly.