Two laser anemometers, a differential laser Doppler anemometer (LDA) of NLR and a laser-two-focus (L2F) anemometer of DLR, were installed in a research aircraft to demonstrate their capabilities for in-flight flow investigations. Both anemometers use a diode laser as a light source and an avalanche photodiode for detecting scattered light. The aircraft was flown in differnet atmospheric conditions, e.g. close to temperature inversion layers, in clouds and in polluted air above industrial regions to investigate whether it is possible to measure without artificially seeding air. The optical access was provided by two glass inserts in the emergency exit of the aircraft. Measurement volumes were traversed through the flow perpendicular to the fuselage. In this manner, the anemometers measured mean velocities, turbulence levels and for L2F additionally to these quantities the flow direction in the boundary layer of the fuselage.


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    Title :

    Laser Anemometry for In-Flight Flow Investigations


    Contributors:

    Publication date :

    1995


    Size :

    12 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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