Shear force reconstruction in a vertically oriented probe microscope using a super-twisting observer

Thang Nguyen Tien, Said G Khan, Christopher Edwards, Guido Herrmann, Robert L Harniman, Stuart C Burgess, Massimo Antognozzi, Mervyn J Miles

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

4 Citations (Scopus)
Original languageEnglish
Title of host publication Proceedings of the 52nd IEEE Conference on Decision and Control (CDC 2013)
Place of PublicationFirenze, Italy
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
ISBN (Print)978-1-4673-5714-2
DOIs
Publication statusPublished - 10 Dec 2013
Event52nd IEEE Conference on Decision and Control (CDC 2013) - Florence, Italy
Duration: 10 Dec 201313 Dec 2013

Conference

Conference52nd IEEE Conference on Decision and Control (CDC 2013)
CountryItaly
CityFlorence
Period10/12/1313/12/13

Bibliographical note

In this paper, a scheme employing a super-twisting sliding mode observer is proposed to reconstruct the unknown shear forces at the tip of the vertically oriented cantilever (VOC) which is the key component of Bristol University's Vertically Oriented Probe Microscope (VOPM). The VOPM is unique in the sense that the distance of the VOC tip from the specimen can be measured using the known amplitude of the horizontal excitation of the cantilever. This amplitude is directly influenced by the interaction of the VOC with the fluid layer above the biological specimen. The shear forces caused by the fluid interaction increase with the proximity of the tip to the specimen. Thus, knowledge of the shear forces is another important measure of the closeness of the VOC tip to the specimen. Simulation examples show the feasibility of its eventual real-time application.

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