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Smart Laser Interferometer with Electrically Tunable Lenses for Flow Velocity Measurements through Disturbing Interfaces

TUD Laboratory for Measurement and Testing Techniques, TUD Faculty of Electrical and Computer Engineering, TUD School of Engineering, TU Dresden, Helmholtzstraße 18, 01069 Dresden, Germany
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Photonics 2015, 2(1), 1-12; https://doi.org/10.3390/photonics2010001
Received: 6 November 2014 / Accepted: 29 December 2014 / Published: 5 January 2015
Interferometric velocity measurements are of great importance at flow investigations. However, the laser beams can be distorted at the interfaces between optical media of different refractive indices. Temporal fluctuations of these distortions will cause a deterioration of the laser interferometer signals. We have harnessed the power of programmable photonics devices to eliminate this signal deterioration. Non-invasive flow velocity measurements through a rapidly fluctuating media interface with large strokes of about 100 microns are presented. Our work represents a paradigm shift for interferometric velocity measurement techniques from using static to dynamic optical elements. View Full-Text
Keywords: adaptive optics; tunable membrane lens; Mach Zehnder interferometer; flow velocity measurements adaptive optics; tunable membrane lens; Mach Zehnder interferometer; flow velocity measurements
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Czarske, J.W.; Radner, H.; Leithold, C.; Büttner, L. Smart Laser Interferometer with Electrically Tunable Lenses for Flow Velocity Measurements through Disturbing Interfaces. Photonics 2015, 2, 1-12.

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