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Smooth trajectories for imaging string-like samples in AFM: A preliminary study
 

Summary: Smooth trajectories for imaging string-like samples in AFM: A
preliminary study
Peter I. Chang and Sean B. Andersson
Aerospace and Mechanical Engineering
Boston University, Boston, MA 02215
{itchang,sanderss}@bu.edu
Abstract-- In this paper, we present a high-level feedback
control algorithm for rapid imaging in atomic force microscopy
(AFM). This algorithm is designed for samples which are
string-like, such as DNA and biopolymers. The tip control of
the microscope is performed in real-time while probing the
unknown sample based on feedback from the tip and a model
of the sample. This model is continually updated based on the
measurements. To avoid exciting unwanted dynamics in the
AFM system, the tip is steered at a constant velocity along
a sinusoidal trajectory whose average is the estimate of the
sample curve. We discuss the advantages of the algorithm and
some of the challenges which must be overcome to make this
technique a viable approach to AFM imaging.
I. INTRODUCTION

  

Source: Andersson, Sean B. - Department of Aerospace and Mechanical Engineering, Boston University

 

Collections: Engineering