Advancement of an Interferometric Flow Velocity Measurement Technique by Adaptive Optics |
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Authors: | Lars Büttner Christoph Leithold Jürgen Czarske |
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Affiliation: | 1. Faculty of Electrical and Computer Engineering, Laboratory for Measurement and Testing Techniques , Technische Universit?t Dresden , Dresden , Germany Lars.Buettner@tu-dresden.de;3. Faculty of Electrical and Computer Engineering, Laboratory for Measurement and Testing Techniques , Technische Universit?t Dresden , Dresden , Germany |
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Abstract: | Flow measurements often take place under difficult conditions. Optical flow measurement techniques are affected by variations of the refractive index, caused e.g., by temperature, concentration, or pressure gradients. This will give rise to an increased measurement uncertainty or cause the measurement to fail. To overcome these limitations, we propose the employment of adaptive optics. In this contribution we present interferometric flow velocity measurements through a fluctuating air-water interface by the use of adaptive optics. Using the adaptive optics, the rate of valid measurement signals can be improved from 28% to 83%. The results are promising to enable measurements in difficult environments affected by refractive index variations which were not accessible so far. |
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Keywords: | adaptive optics flow measurement interferometry laser Doppler velocimetry wavefront correction |
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