We have presented a promising and versatile concept for a highly miniaturized LDV system for two component velocity measurements with velocity direction, together with a novel LDV optic for the measurement head and new methods for autonomous frequency estimation. By using one fiber coupled tunable laser diode for each LDV beam the optical frequency difference of the laser diodes can be used for the directional discrimination and separation of the velocity components. Additionally, the laser power in the measuring volume can be increased and the optical set-up can be simplified using readily available optoelectronic components from the telecommunication market. Together with the miniaturized head this allows the realization and miniaturization of an powerful and affordable 2d-LDV system, while the combination of wavelet and Fourier transform for frequency estimation enables this system to autonomously measure the full range of velocities. In a first step an 1d-LDV system without direction detection has already been used successfully with an experiment at the droptower Bremen. A precursor of this system has flown successfully within a dynamic fluid flow experiment on the sounding rockets TEXUS 41 and EML1. Demonstrating that this powerful measuring technique can now easily be used with experiments on parabolic flights, sounding rockets, FOTON missions or the GLOVEBOX on the ISS as well as in the laboratory, wind tunnels, research facilities and industrial or even sportive applications. Given its small size, low power consumption, its simpler and more robust realization, this 2d-LDV system, together with the newly developed algorithms for autonomous frequency estimation, is likely to open up completely new fields for precise flow velocity measurements in space as well as on earth.
Miniaturized laser-doppler-anemometer for space applications
2006
12 Seiten, 15 Bilder, 5 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
Miniaturized laser-Doppler-anemometer for space applications
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