Abstract
Atomic force microscopes have proved to be fundamental research tools in many situations and in a variety of environmental conditions, such as the study of biological samples. Among the possible modes of operation, intermittent contact mode is one that causes less wear to both the sample and the instrument; therefore, it is ideal when imaging soft samples. However, intermittent contact mode is not particularly fast when compared with other imaging strategies. In this paper, we introduce three enhanced control approaches, applied at both the dither and {z} -axis piezos that determine the motion of the microscope tip, to address the limitations of existing control schemes. Our proposed practical strategies are able to eliminate different image artifacts, automatically adapt scan speed to the sample being scanned, and predict its features in real time. The result is that both the image quality and the scan time are improved.
Original language | English |
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Article number | 8059837 |
Pages (from-to) | 1673-1684 |
Number of pages | 12 |
Journal | IEEE Transactions on Control Systems Technology |
Volume | 26 |
Issue number | 5 |
Early online date | 5 Oct 2017 |
DOIs | |
Publication status | Published - 1 Sept 2018 |
Research Groups and Themes
- Engineering Mathematics Research Group
Keywords
- Atomic force microscope
- AFM
- intermittent contact mode
- IC-AFM
- tapping mode
- dynamic PID
- hybrid PID
- scan speed regulator
- predictive controller