Adaptive time-frequency analysis of signals in AFM

Scanning Probe Microscopy 2018

Pukhova, V.^1

Department of Photonics, Saint Petersburg Electrotechnical University LETI, Saint-Petersburg

197376, Russia^1

关键词: Adaptive time-frequency analysis;    Amount of information;    Analysis method;    Multi frequency;    Probe-sample interactions;    Sample surface;    Spectral response;    Time frequency analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/443/1/012026/pdf
DOI  :  10.1088/1757-899X/443/1/012026

来源: IOP

【 摘 要 】

The probe-sample interactions during the AFM experiments represent a case of a multi-frequency behaviour, since they are characterized by the simultaneous excitation of cantilevers eigenmodes and/or their harmonics. Analysis of the data obtained as a result of the interaction between the probe and the sample is of a particular interest not only from a practical point of view, i.e. obtaining information about the surface of the sample, but also this is an interesting methodological task, since the instantaneous processes resulting from the interaction of the probe with the sample surface carry a huge amount of information. To obtain this information, it is necessary to provide an analysis method that is capable of characterizing all of the excited cantilevers frequencies simultaneously and without averaging. In other words, it is necessary to obtain the complete spectral response of the cantilever interacting with the sample surface, i.e. information about the dynamics of cantilever behaviour in time. The aim of the present work is to show the possibilities of time-frequency analysis techniques in analysing the signals of AFM experiments.