Multimode dynamics of atomic-force-microscope tip-sample interactions and application of sensitivity vector fields

Lim, Joosup; Epureanu, Bogdan I.

doi:10.1117/12.715750

Cited by 3 publications

(1 citation statement)

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“…For example, chaotic motions in tappingmode atomic force microscopy (AFM) have been studied, 28À31 and new operating algorithms using chaotic motions have also been discussed. These are based on sensitivity vector¯elds 29,30 or local°ow variations. 32 The increased use of AFM 33 also has been accompanied by rapid growth of various other cantilever-based sensing techniques.…”

Section: Introductionmentioning

confidence: 99%

Exploiting Delayed Nonlinear Feedback for Sensing Based on Bifurcation Morphing

Lim

Epureanu

2011

Int. J. Str. Stab. Dyn.

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Bifurcation morphing created by means of nonlinear feedback excitation is a vibration-based method for sensing. In this work, several new studies are presented to connect previously demonstrated theory to increasingly more practical applications. In particular, in the process of designing nonlinear feedback auxiliary signals, time delays in the circuitry are unavoidable. Advantages as well as possible side e®ects and disadvantages of time delays are discussed. Furthermore, additional time delay is considered as a new design parameter. Increasing the time delay has advantages such as enhanced robustness and sensitivity, which are demonstrated computationally. Moreover, calibration using multiple sensor locations is discussed. A clampedfree cantilever beam structure is modeled and used for computational validation. The beam model resembles cantilever-based resonant sensor systems. Thus, potential applications of the new algorithm are discussed and the results stress the importance of nonlinear features for enhancing sensing performance in mechanical sensors without structural modi¯cations.

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Section: Introductionmentioning

confidence: 99%