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O: Oberflächenphysik

O 15: Postersitzung (Adsorption an Oberfl
ächen, Epitaxie und Wachstum, Organische Dünnschichten, Oxide und Isolatoren, Rastersondentechniken, Zeitaufgelöste Spektroskopie, Methoden)

O 15.54: Poster

Freitag, 4. März 2005, 17:00–20:00, Poster TU D

Simulations of Analogue Control Circuits for the Dynamic Scanning Force Microscope — •Rebecca Kastebo and Michael Reichling — Fachbereich Physik, Osnabrück Universität, Barbarastr.7, 49069 Osnabrück

We study the behaviour of an analogue control circuit presently used in our dynamic scanning force microscope (SFM) by performing simulations of the circuit in the framework of a SPICE program. We devote our simulations to the separation regulator circuit which is responsible for controlling the distance between the cantilever and the sample. In detail, we investigate the response time and the stability conditions in order to avoid oscillations in the circuit, which may cause damage to both, the cantilever and the sample. We compare the results of our simulation to tests performed on the physical circuit of the SFM. It is the aim to optimise the circuits and control parameters depending on the experimental conditions, i.e. the sample and the imaging goal.