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Related Experiment Video

Updated: Jul 24, 2025

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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
PubMed
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.

Keywords:
3-DOF parallel positioning platformactive opticsflexile amplification mechanismlarge stroke and high precisionparticle swarm optimization

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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.