Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 44: Scanning Probe Methods I
O 44.1: Vortrag
Mittwoch, 13. März 2013, 10:30–10:45, H33
Tuning Fork Sensor Spring Constants and Q-Factors in Experiment and Simulation — •Marvin Stiefermann1, Jens Falter2, Harald Fuchs2, and André Schirmeisen1 — 1Universität Gießen — 2Universität Münster
The increasing application of Tuning Fork (TF) based sensors in non-contact Atomic Force Microscopy (nc-AFM) raised the need for a comprehensive investigation of the two most relevant sensor parameters, the spring constant and Q-factor. Those sensors were primarily designed for the application in watches, and the change of these parameters when mounted in the AFM setups is not well understood. In this work we performed detailed measurements and finite element simulations to understand and determine the TF spring constants as well as Q-factors for different mounting geometries. With a specially developed setup, consisting mainly out of a micrometer caliper and a high sensibility scale, it was possible to apply different forces along arbitrary positions of the prong of the TF, which was attached onto a Macor block holder. Reliable results were achieved only by applying compressive and tensile forces to the TF, allowing us to eliminate the contribution of the tungsten tip deformation to the spring constant. In a second step the complete experimental setup was rebuilt in a finite-element computer model, including the glue points, tip mass and position as well as the Macor holder geometry. This model is in quantitative agreement with the experimental results for the spring constant and allows us to identify the critical parameters to obtain a high Q- factor.