Apply tapping mode Atomic Force Microscope with CD/DVD pickup head in fluid

This paper proposes a tapping mode scanning sample type Atomic Force Microscope (AFM) equipped with a CD/DVD pick-up-head (PUH) used to measure the deflection of the cantilever beam of the probe in the liquid. To start with, we build an adaptive Quality-Factor-controller (Q-controller) to modulate the interaction force between the tip and the sample. To implement the above systems, we have designed a novel AFM mechanism and proposed an adaptive sliding-mode controller for it. For testing the system capability and analyzing the biomorphic change of the sample in liquid, we have conducted a series of experiments, and the results can help us to understand more about the mechanism of the sample in liquid.