Question: The following image is Atomic Force Microscope. The sample's surface profile image is obtained by scanning a sharp tip on the sample surface, while the

The following image is Atomic Force Microscope. The sample's surface profile image is obtained by scanning a sharp tip on the sample surface, while the distance between the tip and sample surface is kept as constant through a PID feed-back control loop. The sample surface image contains three zones A, B, and C, where zone B truly reflects the sample surface topography; while zone C is too flat and zone A is too rough containing large noise.

Write down the PID control algorithm for this scanning imaging instrument. Define the variables in the equation.

What are the possible reasons to form the A and C zones,

What are the possible reasons to form the A and C zones, respectively? 4499.9 C B A 4499. um 2250.8 0.0 2250.0

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