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Publication - Professor Guido Herrmann

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

    Citation

    Zhang, K, Hatano, T, Edwards, C, Herrmann, G, Burgess, SC, Antognozzi, M, Khan, SG, Harniman, RL & Miles, MJ, 2019, ‘A super-twisting observer for atomic-force reconstruction in a probe microscope’. Control Engineering Practice.

    Abstract

    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

    Full details in the University publications repository