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Design and Parameter Identification for a Positioning Platform with a Large Stroke and High Precision for Segmented
Zihao Yin1,2, Rongjie Qin1,2, Haoting Du1,2
1Key Laboratory of Infrared System Detection and Imaging Technologies, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China.
Micromachines
|July 8, 2023
Summary
A novel parallel positioning platform was developed for active optical systems. This platform enables precise co-focus and co-phase adjustment of segmented mirrors with high stroke and resolution.
Area of Science:
- Optics
- Mechanical Engineering
- Control Systems
Background:
- Active optical systems require precise alignment of segmented mirrors.
- Existing positioning systems may lack the necessary stroke and resolution for co-focus and co-phase adjustments.
Purpose of the Study:
- To develop and verify a large-stroke, high-precision parallel positioning platform for segmented mirror systems.
- To enable accurate co-focus and co-phase adjustments in active optical systems.
Main Methods:
- Design of a parallel positioning platform with three flexible legs and capacitive displacement sensors.
- Integration of a forward-type amplification mechanism for piezoelectric actuators.
- Application of a linear model for amplification ratio identification.
- Utilizing particle swarm optimization for control matrix identification.
- Employing capacitive displacement sensors for precise position and attitude measurement.
Main Results:
- The platform achieved a translation stroke of 220 μm and a deflection stroke of 2.0 mrad.
- High step resolution of 20 nm (translation) and 0.19 μrad (deflection) was demonstrated.
- Experimental results validated the theoretical model with a maximum deviation of 5.67%.
- The platform exhibited excellent and stable performance under a load of up to 5 kg.
Conclusions:
- The developed parallel positioning platform meets the stringent requirements for segmented mirror co-focus and co-phase adjustment.
- The system offers a viable solution for ultra-high precision positioning in advanced optical applications.
- The combination of novel mechanical design and advanced control algorithms ensures high performance and stability.
Keywords:
3-DOF parallel positioning platformactive opticsflexile amplification mechanismlarge stroke and high precisionparticle swarm optimizationMore Related Videos
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