Increasing the SNR of electrical AFM methods by active mechanical Q-control

D. Kohl; C. Kerschner; P. Mesquida; G. Schitter

doi:10.1016/j.ifacol.2019.11.692

Increasing the SNR of electrical AFM methods by active mechanical Q-control

D. Kohl^*, C. Kerschner, P. Mesquida, G. Schitter

^*Corresponding author for this work

Research output: Contribution to journal › Conference paper › peer-review

Abstract

This paper investigates the benefit of active mechanical Q-control for electrical surface potential measurements in atomic force microscopy. The effective quality-factor of the electrically stimulated cantilever oscillation is additionally increased mechanically at the same frequency with an active analog Q-controller, while in lift-mode. It is shown experimentally that the cantilever oscillation amplitude and therefore the measurement sensitivity is improved by a factor of 15. By spectral noise analysis around the resonance frequency of the cantilever, an increase of the signal-to-noise ratio from 2.5dB to 23dB is achieved.

Original language	English
Pages (from-to)	307-312
Number of pages	6
Journal	IFAC-PapersOnLine
Volume	52
Issue number	15
DOIs	https://doi.org/10.1016/j.ifacol.2019.11.692
Publication status	Published - 1 Sept 2019
Event	8th IFAC Symposium on Mechatronic Systems, MECHATRONICS 2019 - Vienna, Austria Duration: 4 Sept 2019 → 6 Sept 2019

Keywords

AFM
Electric measurement modes
Q-control
SNR

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10.1016/j.ifacol.2019.11.692

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title = "Increasing the SNR of electrical AFM methods by active mechanical Q-control",

abstract = "This paper investigates the benefit of active mechanical Q-control for electrical surface potential measurements in atomic force microscopy. The effective quality-factor of the electrically stimulated cantilever oscillation is additionally increased mechanically at the same frequency with an active analog Q-controller, while in lift-mode. It is shown experimentally that the cantilever oscillation amplitude and therefore the measurement sensitivity is improved by a factor of 15. By spectral noise analysis around the resonance frequency of the cantilever, an increase of the signal-to-noise ratio from 2.5dB to 23dB is achieved.",

keywords = "AFM, Electric measurement modes, Q-control, SNR",

author = "D. Kohl and C. Kerschner and P. Mesquida and G. Schitter",

year = "2019",

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doi = "10.1016/j.ifacol.2019.11.692",

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T1 - Increasing the SNR of electrical AFM methods by active mechanical Q-control

AU - Kohl, D.

AU - Kerschner, C.

AU - Mesquida, P.

AU - Schitter, G.

PY - 2019/9/1

Y1 - 2019/9/1

N2 - This paper investigates the benefit of active mechanical Q-control for electrical surface potential measurements in atomic force microscopy. The effective quality-factor of the electrically stimulated cantilever oscillation is additionally increased mechanically at the same frequency with an active analog Q-controller, while in lift-mode. It is shown experimentally that the cantilever oscillation amplitude and therefore the measurement sensitivity is improved by a factor of 15. By spectral noise analysis around the resonance frequency of the cantilever, an increase of the signal-to-noise ratio from 2.5dB to 23dB is achieved.

AB - This paper investigates the benefit of active mechanical Q-control for electrical surface potential measurements in atomic force microscopy. The effective quality-factor of the electrically stimulated cantilever oscillation is additionally increased mechanically at the same frequency with an active analog Q-controller, while in lift-mode. It is shown experimentally that the cantilever oscillation amplitude and therefore the measurement sensitivity is improved by a factor of 15. By spectral noise analysis around the resonance frequency of the cantilever, an increase of the signal-to-noise ratio from 2.5dB to 23dB is achieved.

KW - AFM

KW - Electric measurement modes

KW - Q-control

KW - SNR

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U2 - 10.1016/j.ifacol.2019.11.692

DO - 10.1016/j.ifacol.2019.11.692

M3 - Conference paper

AN - SCOPUS:85077492788

SN - 2405-8963

VL - 52

SP - 307

EP - 312

JO - IFAC-PapersOnLine

JF - IFAC-PapersOnLine

IS - 15

T2 - 8th IFAC Symposium on Mechatronic Systems, MECHATRONICS 2019

Y2 - 4 September 2019 through 6 September 2019

ER -

Increasing the SNR of electrical AFM methods by active mechanical Q-control

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Keywords

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