Fig. 6
From: Optical excitation of atomic force microscopy cantilever for accurate spectroscopic measurements
Top shows the photodiode signal as a function of the number of fiber walker steps as it is retracted from the cantilever. Peaks are indicated via circles, which are then used to determine the number of steps between adjacent fringes. Bottom shows sensitivity S which is calculated by taking the derivative of the photodiode signal and dividing by the average step size between fringes