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A novel flexure-based vertical nanopositioning stage with large travel range
Xiaobo Zhu1, Xiao Xu1, Zhijie Wen1
1State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
The Review of Scientific Instruments
|November 2, 2015
Summary
A novel flexure-based nanopositioning stage offers a large vertical travel range using a piezoelectric actuator (PZT) and a displacement amplification mechanism (DAM). This design achieves high resolution and minimal cross-coupling for precision applications.
Area of Science:
- Mechanical Engineering
- Nanotechnology
- Precision Engineering
Background:
- Precision positioning systems are crucial for advanced manufacturing and scientific research.
- Existing nanopositioning stages often face limitations in travel range, resolution, or cross-coupling.
- Piezoelectric actuators (PZT) offer high precision but require mechanisms to achieve large travel ranges.
Purpose of the Study:
- To design and develop a novel flexure-based vertical nanopositioning stage with a large travel range.
- To integrate a hybrid displacement amplification mechanism (DAM) for efficient motion transfer.
- To incorporate motion guiding and decoupling mechanisms to minimize cross-coupling and protect the PZT actuator.
Main Methods:
- Design of a hybrid displacement amplification mechanism (DAM) with an amplification ratio of 12.1.
- Implementation of motion guiding and decoupling mechanisms to enhance performance.
- Analytical modeling and finite element analysis (FEA) for optimizing stage dimensions.
- Fabrication and experimental testing of a prototype stage.
Main Results:
- Achieved a vertical travel range of 214 μm with a resolution of 8 nm.
- Identified first two resonance frequencies at 205 Hz and 1206 Hz.
- Demonstrated low cross-coupling, with maximum lateral and angular variances below 0.78 μm and 95 μrad, respectively.
- Verified the stage's suitability for limited vertical spaces due to its low-profile structure.
Conclusions:
- The novel flexure-based nanopositioning stage effectively achieves a large vertical travel range and high resolution.
- The integrated mechanisms significantly improve stiffness, dynamics, and decoupling capabilities.
- The developed stage is a promising solution for precision positioning tasks in confined environments.
