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A super-twisting observer for atomic-force reconstruction in a probe microscope

Research output: Contribution to journalArticle

Original languageEnglish
Article number104191
Number of pages12
JournalControl Engineering Practice
Early online date15 Nov 2019
DateAccepted/In press - 8 Oct 2019
DateE-pub ahead of print - 15 Nov 2019
DatePublished (current) - 1 Jan 2020


This paper presents a new methodology employing a super-twisting sliding mode observer to reconstruct un-measureable atomic-forces at nano-Newton precision in a Vertically Oriented Probe Microscope (VOPM). The VOPM senses the deflection of a vertically oriented cantilever, caused by shear-force interaction with a confined water layer above the sample-substrate. The paper describes the development of a model and the subsequent experimental process for computing its parameters. This forms the basis for the design of a super-twisting observer to estimate the unknown shear-forces. The reconstructed force can be decomposed into elastic and viscous components, which are important in biological research

    Research areas

  • Probe Microscope, Shear Force, Elastic and Dissipative Force, Sliding Mode Control, Super-Twisting Observer



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    Embargo ends: 15/11/21

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    Licence: CC BY-NC-ND


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