Paper Info
Title
Analysis of PI-Control for Atomic Force Microscopy in Contact Mode
Abstract
This article investigates the properties, from a nonlinear control system standpoint, of atomic force microscope (AFM) systems, whenever operated in contact mode and controlled in the vertical direction by proportional-integral control law. By modeling the AFM as a system in which a piezo-electric actuator and a cantilever mutually interact in order to produce the sample topography, ensuing distortions affecting the quality of the yielded topography measurement are naturally cast and analyzed. The proposed investigation considers distortions due to the inception of hysteresis and vibrational dynamics within the piezo-actuator or provoked by system saturation. Both hysteresis and saturation are inherently nonlinear phenomena and are modeled as such. In spite of the inherently nonlinear nature of the AFM dynamics, investigations of the contact mode case from a nonlinear standpoint are lacking within the AFM literature. As the topography yielded by the AFM completely relies on its control algorithm, to the point that the measurement itself <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">corresponds</i> to the control action <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$v(t)$ </tex-math></inline-formula> , it becomes of paramount importance to understand how <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$v(t)$ </tex-math></inline-formula> relates to the actual topography, and how such a relationship is affected by the aforementioned distortions. This article hence intends to contribute to the AFM literature, by providing a study in which the very meaning of the image measurement yielded by the AFM is investigated, in the light of distortions due to nonlinear phenomena. The AFM is considered to be operated in contact mode with a PI algorithm. Furthermore, as a byproduct of the derived nonlinear stability analysis, a novel, model-based algorithm for tuning the PI control gains is provided. Finally, experimental results are presented and analyzed in view of the derived theory.
Year
DOI
Venue
2022
10.1109/TCST.2021.3121321
IEEE Transactions on Control Systems Technology
Keywords
DocType
Volume
Atomic force microscope (AFM) control,nonlinear control,normal form,singular-perturbation form,small-gain arguments,Tikhonov’s theorem,zero dynamics
Journal
30
Issue
ISSN
Citations 
4
1063-6536
0
PageRank 
References 
Authors
0.34
3
4
Name
Order
Citations
PageRank
Saverio Messineo100.34
Michael R. P. Ragazzon211.45
Fabio Busnelli300.34
Jan Tommy Gravdahl4567.73