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UP: Fachverband Umweltphysik
UP 7: Measurement Techniques
UP 7.4: Vortrag
Donnerstag, 19. März 2020, 11:30–11:50, HSZ 105
A novel compact Doppler lidar for Doppler Mie measurements and beyond — •Jan Froh, Alsu Mauer, Josef Höffner, Ronald Eixmann, and Franz-Josef Lübken — Leibniz-Institute of Atmospheric Physics
Doppler lidar with daylight capability are challenging and expensive systems because of the required small FOV and spectral filtering. The Institute of Atmospheric physics has developed a new approach. Beside very compact (1 m3) and less complex, the novel technology is applicable to a large variety of lasers as Doppler Mie, Doppler Rayleigh and/or Doppler Resonance lidar.
We demonstrate first Doppler Mie observations with a diode pumped pulsed alexandrite ring laser with unmatched properties. An optimized receiver allows efficient optical splitting of Rayleigh and Mie scattering. Optical splitting is achieved by combining narrow band spectral filtering with a pulsed laser of exceptional low line width and direct frequency control. By tuning the laser in frequency Aerosols and Doppler wind is measured simultaneously with a new method in the stratosphere. Because Rayleigh scattering is suppressed by approx. 2 orders of magnitude weak Mie signals can be observed which are not visible with established methods because of the strong Rayleigh background.