Laser anemometry for in-flight flow investigations

Two laser anemometers, a differential laser Doppler anemometer of NLR and a laser-two-focus anemometer of DLR, are 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 fo...

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Bibliographic Details
Published in:ICIASF record : International Congress on Instrumentation in Aerospace Simulation Facilities 1995-01, p.23.1-23.7
Main Authors: Jentink, H W, Beversdorff, M, ster, W
Format: Article
Language:English
Subjects:
Aircraft
Bandwidth
Boundary layers
Data acquisition
Data processing
Flow measurement
Laser Doppler velocimeters
Light sources
Personal computers
Photodiodes
Semiconductor lasers
Wind tunnels
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Summary:Two laser anemometers, a differential laser Doppler anemometer of NLR and a laser-two-focus anemometer of DLR, are 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. A ground test with the anemometers is performed before the flight tests. Experience with parallel operation of the anemometers is gained in a free jet and properties of both systems are investigated. Information from the tests enables the analysis performance data in free jet and in flight. The experiment shows that laser anemometer can be applied successfully for in-flight flow measurements. The inherent useful characteristics of the technique that are used extensively in wind-tunnel tests and in other ground applications are also promising for in-flight experiments.
ISSN:0730-2010