Fig. 2
From: PSD microscopy: a new technique for adaptive local scanning of microscale objects
a Noise that dSPACE produces results in < 1 μm movement in each direction; b noise of the system when there is not a laser beam on the PSD; c noise of the whole system except the noise of the micro-manipulator motor; d noise that the whole system produces when everything is on can be seen as an almost 15 μm vibration in each direction; e filtering has reduces the noise movement from 15 to 1–2 μm vibration in each direction; f a comparison of actual signal (blue) with the filtered signal (red graph in the middle) in an experiment