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-control schematics of the electrically driven tuning-fork-based atomic force microscopy. The total current is converted to a voltage by the converter and the phase shifted signal is added back to the drive signal after gain control, which realizes the self-excitation gain.
(Color online) Phase map representing the effective change for a given phase lag. The bright (dark) region indicates the phases where is enhanced (reduced). Here and for a small conventional TF.
(Color online) (a) Typical resonance curves where can be measured. The solid curve represents the nominal case of no gain control . (b) Experimental results of control versus gain at the phase difference of 17° (◻, enhancement) and 197° (∎, reduction), in good agreement with the presented theoretical results.
(Color online) (a) Typical temporal signals of decaying oscillation at , 0, and 0.04 . (b) Plot of measured decay times at the phase of 17° (◻) and 197° (∎), in good agreement with the theoretical results.
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