Regensburg 2013 – wissenschaftliches Programm

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MI: Fachverband Mikrosonden

MI 10: Scanning Probe Microscopy

MI 10.2: Vortrag

Donnerstag, 14. März 2013, 09:45–10:00, H5

Adapting the Principle of Atomic Force Microscopy for Highly Resolved Measurements of Atmospheric Turbulence with the 2D-Atmospheric Laser Cantilever Anemometer — •Ingrid Neunaber, Jaroslaw Puczylowski, Joachim Peinke, and Michael Hölling — ForWind - Center for Wind Energy Research, Institute of Physics, University of Oldenburg, Germany

Using the principle of atomic force microscopy, we developed a sensor for characterization of atmospheric turbulent flow. As there are various applications in wind energy research and fundamental research, the demand for high resolving and reliable sensors is very high. With the 2D-Atmospheric Laser Cantilever Anemometer (2D-ALCA) we provide a sensor, which satisfies these requirements: The 2D-ALCA is capable of collecting data with sampling rates in the kHz-range, which allows for a spatial resolution in the millimeter range according to Taylor's hypothesis for typical atmospheric wind velocities of 10 m/s. Therefore the detection of very small turbulent structures is possible. The 2D-ALCA is a redesigned version of the successfully proofed 2D-LCA, an anemometer designed for laboratory use only. It is adapted to match the hostile operating environment off-shore. The 2D-ALCA is a drag force based sensor; the sensing element is a tiny microstructured cantilever made of stainless steel. When exposed to airflow it experiences a drag force and deflects. This deflection is detected by means of the laser pointer principle. Depending on the inflow direction the cantilever experiences two deformation modes (bending and twisting), thus enabling simultaneous measurements of 2 velocity components.