Dresden 2003 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 13: Fluid dynamics II

DY 13.1: Vortrag

Montag, 24. März 2003, 11:15–11:30, G\"OR/229

Fabrication and Characterization of Miniaturized Thermocouples — •Marco Munzel, J. Peinke, and A. Kittel — Carl von Ossietzky University of Oldenburg, Faculty of Physics, 26111 Oldenburg, Germany

The measurement of thermal fluctuations is important for discovering transport features of a passive scalar in fluids. We present a thermal sensor based on a miniaturized thermocouple. Its coaxial setup results from the fabrication as a micropipette normally used in neurobiology. The quartz glass micropipettes contain a core of platinum or resistance wire and are coated with gold or silicon. The core material is inserted as a wire and thinned during the fabrication process. The achieved tip diameters are 1µm and less which enhance the spatial and temporal resolution significantly. Because of its chemically inert coating, these sensors are applicative for detecting temperature fluctuations in a large variety of liquids and gases. In addition, such thermocouples are intrinsically suitable for applications in scanning probe microscopy. The characterization of these sensors and first results from turbulent free-jet measurements are presented.