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instruments:sodar:sodar

Sodar

Mentor: J.H. Schween.

Principle

A SODAR is a wind profiler based on the sonic detecting and ranging principle. A sound is emitted and backscattered at inhomogeneities of the temperature field. Travel time of the backscattered sound signal is related to distance, Doppler shift gives the wind speed along the sound beam. Several tilted sound beams allow to infer the vector components of the wind. Strength of the reflected signal gives information about the turbulence intensity.

Instrument


METEK Doppler SODAR PCS.2000-64/MF at the TR32 test site Selhausen managed by Research Center Jülich as part of the FlowWatch project.

Data

The sodar is currently inactive.

Latest observations

History

Period Place Project
08/2008 - 02/2015 Selhausen, Germany TR32

Specifications

Parameter Specification Remark
Frequencies / kHz 1.493, 1.693, 1.893, 2.093, 2.293 during daytime adjustable in 1.5-3
1.493, 1.893, 2.293 during nightime
Wavelengths / mm 228, 201, 180, 163, 148 depends on speed of sound (cS), values here are for 15°C
tilt angles / deg 25, 22, 19, 18, 16 depends on cS and frequency, see setup manual
Pulse Peak Power / W ?
Average Power / W ?
Repetition Rate / Hz ~.69 Depends on cS and 'noise height' (zN) it is cS/zN
Average every / min 10 Adjustable
Pulse Width / ms 58.7 Depends on cS and dz (dz/cS)
Range resolution / m 20 Adjustable in 5-50
Range / m 400 Adjustable
lowest height / m 30 Adjustable
noise height / m 490 Adjustable
Accuracy horizontal wind ± max(0.5m/s,10%)
Accuracy vertical wind ± 0.1 m/s
Accuracy direction ± 5°
Field-of-View Divergence ? Depends on many parameters
Size / m³ 2 x 2 x 2 sound protection walls
Average Power consumption / W 380 PC + loudspeaker unit
Weight / kg 120 Antenna array alone

Internal information

instruments/sodar/sodar.txt · Last modified: 2016/08/31 08:55 by uli