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Phase-Locked loops lock-in range in Frequency Modulated-Atomic Force Microscope nonlinear control system

Bueno, Atila Madureira; Balthazar, Jose Manoel; Castilho Piqueira, Jose Roberto Universidade De São Paulo

COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION, AMSTERDAM, v. 17, n. 7, supl. 1, Part 3, pp. 3101-3111, JUL, 2012

ELSEVIER SCIENCE BV; AMSTERDAM 2012

Acesso online

  • Título:
    Phase-Locked loops lock-in range in Frequency Modulated-Atomic Force Microscope nonlinear control system
  • Autor: Bueno, Atila Madureira; Balthazar, Jose Manoel; Castilho Piqueira, Jose Roberto
  • Universidade De São Paulo
  • Assuntos: Frequency-Modulated Atomic Force; Microscopy; Phase-Locked Loops; Bifurcation; Nonlinear Dynamics; Mathematical Model; Mathematics; Applied; Mathematics; Interdisciplinary Applications; Mechanics; Physics; Fluids & Plasmas; Physics; Mathematical
  • É parte de: COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION, AMSTERDAM, v. 17, n. 7, supl. 1, Part 3, pp. 3101-3111, JUL, 2012
  • Descrição: Since the mid 1980s the Atomic Force Microscope is one the most powerful tools to perform surface investigation, and since 1995 Non-Contact AFM achieved true atomic resolution. The Frequency-Modulated Atomic Force Microscope (FM-AFM) operates in the dynamic mode, which means that the control system of the FM-AFM must force the micro-cantilever to oscillate with constant amplitude and frequency. However, tip-sample interaction forces cause modulations in the microcantilever motion. A Phase-Locked loop (PLL) is used to demodulate the tip-sample interaction forces from the microcantilever motion. The demodulated signal is used as the feedback signal to the control system, and to generate both topographic and dissipation images. As a consequence, a proper design of the PLL is vital to the FM-AFM performance. In this work, using bifurcation analysis, the lock-in range of the PLL is determined as a function of the frequency shift (Q) of the microcantilever and of the other design parameters, providing a technique to properly design the PLL in the FM-AFM system. (C) 2011 Elsevier B.V. All rights reserved.
  • DOI: 10.1016/j.cnsns.2011.11.023
  • Títulos relacionados: COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
  • Editor: ELSEVIER SCIENCE BV; AMSTERDAM
  • Data de publicação: 2012
  • Idioma: Inglês

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