Temperature Accurate in All Weather
Spacing Matches Sodar Winds
Lifetime Calibration-Free
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RASS for Sodar Wind Profilers

A RASS Extension for FAS Series Sodars makes a Scintec FAS Series Sodar a high-performance temperature profiler also. The RASS Extension for FAS Series consists of four radio antennas which are placed around the acoustic antenna of the sodar wind profiler. The electromagnetic waves emitted by the radio antennas are scattered back by the sound waves emitted by the sodar antenna and are then received again by the radio antennas. There is a Doppler shift of the reflected radio waves which depends on the travel speed of the sound waves and hence on the temperature within the sensing volume. The operation software inverts this relationship and calculates the temperature versus height with high accuracy.

All RASS Extensions for Sodar can easily be integrated into existing FAS Series Sodar wind profiler systems. The vertical spacing of the measurement results corresponds to the vertical spacing of the sodar wind measurements.

The RASS technology is unmatched when it comes to accuracy and reliability of temperature measurements and superior to passive radiometer sensors. Unlike radiometers, the RASS can resolve even complex temperature structures and does not require any regular calibration. This makes the RASS not only the most accurate and reliable but also the most cost-effective remote temperature measurement device.

Applications
Air Quality
Aviation
Climate Research
Emergency Response
Forest Fire
Meteorological Research
Water and Agriculture
Weather Forecasting
Wind Energy
Models
RASS Extension RAE2
for SFAS, MFAS, XFAS

The Scintec RAE2 RASS Extension upgrades any Sodar model (SFAS, MFAS or XFAS) to allow precise measurements of temperature profiles in the atmospheric boundary layer.

vertical temperature profiles with high spatial resolution
temperature measurements in combination with Sodar SFAS, MFAS or XFAS
unaffected by precipitation and turbulence-free atmospheres
immune to ground clutter and noise
maximum range up to 600 / 800 / 1000 m (with SFAS/ MFAS / XFAS)
windRASS Extension
for SFAS and MFAS

The Scintec windRASS Extension upgrades the Sodar models SFAS or MFAS to work in radio-acoustic mode for precise measurements of both wind and temperature.

vertical temperature profiles with high spatial resolution
temperature and robust wind measurements in combination with Sodar SFAS or MFAS
unaffected by precipitation and turbulence-free atmospheres
immune to ground clutter and noise
maximum range up to 600 / 800 / 1000 m (with SFAS/ MFAS / XFAS)
Competitive Advantages
Array Antenna With Low Sidelobes
The Scintec RAE2 and windRASS Extensions use modern array antennas for the radio frequency. This allows for lower sidelobes than with traditional parabolic reflectors, going along with a lower transmission-reception antenna crosstalk, a higher system sensitivity and a larger vertical measurement range.
Suitable for Unusual Temperature Profiles
When it comes to safety in aviation or air quality emergency response, it is important that a remote temperature sensor can reliably measure even in unusual meteorological conditions. As an active system, RASS can reliably measure temperature profiles even in cases of extraordinary vertical temperature distributions, such as strong inversions. This differs from a radiometer which, as a passive system, only receives natural thermal radiation and must derive temperature profiles using statistical methods. While a radiometer can produce good average RMS differences (if calibrated and trained properly), unlike RASS it often fails in individual situations.
Reliable Operation With Precipitation
RASS operates with wavelengths which are much longer than the size of precipitation particles. Also, RASS does not involve radiometry which is affected by water-related absorption. Both characteristics allow RASS to measure in precipitation without performance degradation.
Lifetime Calibration-Free
RASS systems are lifetime calibration-free. RASS derives temperature from relative changes in Doppler frequency which are determined using digital technology. Hence a RASS Extension for LAP® Series is long term stable and there is no calibration drift over weeks, months or years.