Such form is explained from excitations of mechanical resonances in the cantilever holder, which is immersed into the fluid. It can be found the peaks, whose amplitude reduce during approaching to the surface. Such peaks are suitable for semicontacting in fluid. Frequency characteristic of cantilever in water depending on distance from surface. Brighter areas correspond to the larger amplitude.
Right axis indicate distance from start point.
Arrow indicates the direction of cantilever movement. One of the important advantages of this design is possibility of measurement both in drop of the fluid placed on the sample surface, and in the vessel filled by fluid. Schematic view of scanning in the fluid drop. Structure of film of graphitized polytetrafluoroetilene deposited on silicon surface by rubbing. During scanning the laser ray penetrate the glass, which is immersed in fluid.