Blar i NTNU Open på forfatter "Harcombe, David M."
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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 ... -
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 ... -
Generalized Lyapunov Demodulator for Amplitude and Phase Estimation by the Internal Model Principle
Ragazzon, Michael Remo Palmén; Messineo, Saverio; Gravdahl, Jan Tommy; Harcombe, David M.; Ruppert, Michael G. (Journal article; Peer reviewed, 2019)Effective demodulation of amplitude and phase is a requirement in a wide array of applications. Recent efforts have increased the demodulation performance, in particular, the Lyapunov demodulator allows bandwidths up to ... -
The Generalized Lyapunov Demodulator: High-Bandwidth, Low-Noise Amplitude and Phase Estimation
Ragazzon, Michael Remo Palmén; Messineo, Saverio; Gravdahl, Jan Tommy; Harcombe, David M.; Ruppert, Michael G. (Journal article, 2022)Effective demodulation of amplitude and phase is a requirement in a wide array of applications. Recent efforts have increased the demodulation performance, in particular, the Lyapunov demodulator allows bandwidths up to ... -
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 ...