Browsing NTNU Open by Author "Fleming, Andrew J."

Now showing items 1-6 of 6

    • A review of demodulation techniques for amplitude-modulation atomic force microscopy 

      Ruppert, Michael G.; Harcombe, David M.; Ragazzon, Michael Remo Palmén; Moheimani, S.O. Reza; Fleming, Andrew J. (Journal article; Peer reviewed, 2017)
      In this review paper, traditional and novel demodulation methods applicable to amplitude-modulation atomic force microscopy are implemented on a widely used digital processing system. As a crucial bandwidth-limiting component ...

    • Discrete-Time Repetitive Control With Model-Less FIR Filter Inversion for High Performance Nanopositioning 

      Teo, Yik R.; Eielsen, Arnfinn Aas; Gravdahl, Jan Tommy; Fleming, Andrew J. (Journal article, 2014)
      Repetitive control (RC) is used to track and reject periodic exogenous signals. RC achieves tracking by incorporating a model of a periodic signal in the feedback path, which provides infinite loop-gain at the harmonic ...

    • Frequency domain analysis of robust demodulators for high-speed atomic force microscopy 

      Ruppert, Michael G.; Harcombe, David M.; Ragazzon, Michael Remo Palmén; Moheimani, S.O. Reza; Fleming, Andrew J. (Journal article; Peer reviewed, 2017)
      A fundamental but often overlooked component in the z-axis feedback loop of the atomic force microscope (AFM) operated in dynamic mode is the demodulator. Its purpose is to obtain a preferably fast and low-noise estimate ...

    • Higher-Harmonic AFM Imaging with a High-Bandwidth Multifrequency Lyapunov Filter 

      Harcombe, David M.; Ruppert, Michael G.; Ragazzon, Michael Remo Palmén; Fleming, Andrew J. (Journal article; Peer reviewed, 2017)
      A major difficulty in multifrequency atomic force microscopy (MF-AFM) is the accurate estimation of amplitude and phase at multiple frequencies for both z-axis feedback and material contrast imaging. A lock-in amplifier ...

    • Lyapunov estimation for high-speed demodulation in multifrequency atomic force microscopy 

      Harcombe, David M.; Ruppert, Michael G.; Ragazzon, Michael Remo Palmén; Fleming, Andrew J. (Journal article; Peer reviewed, 2018)
      An important issue in the emerging field of multifrequency atomic force microscopy (MF-AFM) is the accurate and fast demodulation of the cantilever-tip deflection signal. As this signal consists of multiple frequency ...

    • Lyapunov Estimator for High-Speed Demodulation in Dynamic Mode Atomic Force Microscopy 

      Ragazzon, Michael Remo Palmén; Ruppert, Michael G.; Harcombe, David M.; Fleming, Andrew J.; Gravdahl, Jan Tommy (Journal article; Peer reviewed, 2017)
      In dynamic mode atomic force microscopy (AFM), the imaging bandwidth is governed by the slowest component in the open-loop chain consisting of the vertical actuator, cantilever, and demodulator. While the common demodulation ...