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Impulsive control for fast nanopositioning.

Tomas Tuma1, Abu Sebastian, Walter Häberle

  • 1IBM Research-Zurich, Säumerstrasse 4, 8803 Rüschlikon, Switzerland. uma@zurich.ibm.com

Nanotechnology
|February 24, 2011
PubMed
Summary
This summary is machine-generated.

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This study introduces impulsive control, a novel non-linear technique for high-speed nanopositioning. It significantly enhances tracking performance and disturbance rejection in systems like atomic force microscopes.

Area of Science:

  • Control Engineering
  • Nanotechnology
  • Applied Physics

Background:

  • High-speed nanopositioning is crucial for advanced scientific instruments.
  • Linear controllers face limitations in achieving precise control under disturbances and noise.
  • Atomic Force Microscopy (AFM) requires sub-nanometer precision for imaging and manipulation.

Purpose of the Study:

  • To present a non-linear control scheme for high-speed nanopositioning.
  • To demonstrate the effectiveness of impulsive control over traditional linear methods.
  • To improve tracking performance, disturbance rejection, and noise tolerance in nanopositioning systems.

Main Methods:

  • Developed a non-linear control scheme utilizing impulsive control.
  • Implemented controller state alterations in a discontinuous manner at discrete time instances.

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  • Experimentally validated the impulsive control strategy on an atomic force microscope (AFM).

    • Main Results:

    • Achieved simultaneous good tracking performance, disturbance rejection, and tolerance to measurement noise.
    • Demonstrated significant improvements in tracking performance compared to conventional methods.
    • Validated the practical applicability of impulsive control in real-world nanoscale applications.

    Conclusions:

    • Impulsive control offers a robust and effective non-linear strategy for high-speed nanopositioning.
    • This technique overcomes limitations of linear controllers in demanding environments.
    • The experimental results confirm substantial enhancements in nanopositioning accuracy and stability.