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2 article(s) from Moheimani, S. O. Reza

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

Michael G. Ruppert,
David M. Harcombe,
Michael R. P. Ragazzon,
S. O. Reza Moheimani and
Andrew J. Fleming

Beilstein J. Nanotechnol. 2017, 8, 1407–1426, doi:10.3762/bjnano.8.142

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Figure 1: (a) Time-domain example of an amplitude modulated signal with carrier frequency f_c = 50 Hz, modulat...

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Figure 2: Classification of demodulation methods discussed in this paper.

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Figure 3: (a) Functional block diagram of the lock-in amplifier implementation and (b) illustrative double-si...

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Figure 4: (a) Functional block diagram of the high-bandwidth lock-in amplifier implementation and (b) illustr...

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Figure 5: General block diagram of the Kalman filter for demodulation. Thick lines indicate vector-valued sig...

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Figure 6: Functional block diagram of the Lyapunov filter implementation.

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Figure 7: Functional block diagram of (a) moving average filter and (b) mean absolute deviation measurement t...

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Figure 8: Functional block diagram of (a) the peak hold method and (b) the modified peak hold method based on...

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Figure 9: Functional block diagram of the coherent demodulator implementation.

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Figure 10: Schematic signal flow of the numerical integration scheme employed by the coherent demodulator with...

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Figure 11: Tracking bandwidth frequency response of the demodulators showing the −3 dB tracking bandwidth and ...

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Figure 12: Off-mode rejection of the demodulators for a carrier frequency of f_c = 50 kHz and a tracking bandwi...

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Figure 13: Off-mode rejection of (a) fourth-order lock-in amplifier and (b) first-order Kalman filter for a ca...

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Figure 14: Schematic block diagram of the reference experiment of filtering a band-limited white noise process...

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Figure 15: Schematic block diagram of bandwidth-vs-noise experiment of recovering an amplitude-modulated band-...

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Figure 16: Tracking bandwidth vs total integrated noise (TIN) for each demodulator (blue circles) and for a lo...

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Figure 17: (a) Frequency response of the DMASP cantilever in open-loop (blue) and for various quality factor c...

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Figure 18: 3D image, 2D image and cross section of amplitude estimates obtained from (a) lock-in amplifier wit...

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Figure 19: 3D image, 2D image and cross section of amplitude estimates obtained from (a) lock-in amplifier wit...

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Figure 20: Functional block diagram of the Kalman filter implementation. Thick lines indicate vector-valued si...

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Figure 21: Maximum tracking bandwidth of (a) coherent demodulator (n = 6) and (b) half-period coherent demodul...

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Figure 22: Relationship between demodulator tuning variable and achievable tracking bandwidth.

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Figure 23: Experimental and theoretical total integrated noise of a low-pass filtered white noise process for ...

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Review

Published 10 Jul 2017

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High-bandwidth multimode self-sensing in bimodal atomic force microscopy

Michael G. Ruppert and
S. O. Reza Moheimani

Beilstein J. Nanotechnol. 2016, 7, 284–295, doi:10.3762/bjnano.7.26

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Figure 1: Simplified cross-section schematic of a beam with bonded piezoelectric layer. An electric field E₃ ...

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Figure 2: (a) Annotated photo, (b) schematic and (c) electrical circuit model of the piezoelectric cantilever....

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Figure 3: Block diagram representing the transfer function from voltage actuation and tip disturbance to char...

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Figure 4: Block diagram of the self-sensing scheme with dual feedforward compensator to cancel the capacitive...

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Figure 5: Photo of the implemented PCB circuit for bimodal charge sensing.

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Figure 6: (a) Frequency response measured with the OBD sensor (−) of an NT-MDT NSG01 base-excited cantilever ...

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Figure 7: (a) Frequency response of the first flexural mode measured with the charge sensor before (−) and af...

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Figure 8: (a) Voltage noise density estimate of demodulated amplitude obtained from LIA with low-pass filter ...

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Figure 9: Approach (red, −) and retract (blue, −) curves obtained on a TGZ1 calibration grating with OBD sens...

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Figure 10: AFM Experiment on a TGZ1 calibration grating showing the 3D images of topography and fundamental mo...

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Figure 11: Bimodal experiment with the first and fifth eigenmode of the piezoelectric cantilever on a PS/LPDE ...

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Full Research Paper

Published 24 Feb 2016

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