European Facility For Airborne Research

European Facility For Airborne Research Aug. 15, 2018, 23:18

Instrument: WIND Infrared Doppler Lidar

Name WIND Infrared Doppler Lidar
Acronym WIND
Manufacturer DLR - CNRS - INSU
Manufacturer website http://www.dlr.de/ipa/Forschung/RadarLidar/Wind
Operated by DLR
Operated onboard

Instrument type

Name InfraRed Doppler lidar
Acronym IR doppler lidar

Principle of operation

Measured parameter Altitude specific aircraft-relative wind vector
Operating principle

WIND sounds the atmosphere with a 10µm laser beam. The laser beam is transmitted through a bottom window and conically scanned (3 rds/min). The laser light is scattered by micron-size aerosol particles. The light scattered back to the instrument is captured, detected, and analysed. For detection, a hetrodyne technique is used which consists in mixing the received light wave with a continuous wave "local oscillator" laser. The radio-frequency beating pattern is digitized and processed. The processing determines the frequency shift between the outgoing and the received light, which is proportional to the line-of-sight wind component accoding to Dopplers equation. The power of the detected signals also give an information on the reflectivity of the sounded atmospheric volumes. The radial winds and reflectivities measured along one to several conical scans are combined to produce horizontal wind and reflectivity profiles. The profiles extend from the surface to the aircraft altitude.

Measurement(s) Wind & Fluxes

Dimension and weight

External dimension
Weight 0.0

Performance

Operating mode Remote sensing
Range

Resolution

Sensitivity

Accuracy

Bandwidth

Modifications

Not applicable. WIND is a research instrument built by research labs.

Operational restriction

Fly on DLR Falcon 20 exclusively.
The max flight level is 11km.
Needs qualified operator.

Operational requirements

Liquid nitrogen for cooling IR detectors

Certification approvals

Certified for DLR Falcon 20

Additional information

WIND sounds the atmosphere with a 10µm laser beam. The laser beam is transmitted through a bottom window and conically scanned (3 rds/min). The laser light is scattered by micron-size aerosol particles. The light scattered back to the instrument is captured, detected, and analysed. For detection, a heterodyne technique is used which consists in mixing the received light wave with a continuous wave "local oscillator" laser. The radio-frequency beating pattern is digitized and processed. The processing determines the frequency shift between the outgoing and the received light, which is proportional to the line-of-sight wind component according to Doppler's equation. The power of the detected signals also give an information on the reflectivity of the sounded atmospheric volumes. The radial winds and reflectivities measured along one to several conical scans are combined to produce horizontal wind and reflectivity profiles. The profiles extend from the surface to the aircraft altitude.

Access, host and processing

Access

Could also fit on any aircraft having the following characteristics

General description

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This project has received funding from the European Union's Seventh Framework Programme for research, technological development and demonstration under grant agreement no. 312609

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