RASS for Sodar Wind Profilers
A RASS Extension for Sodar makes a Scintec FAS Series Sodar a high-performance temperature profiler. The RASS Extension for Sodar consists of a number of antennas which emit radio waves. These radio waves are reflected at the sound waves emitted by the Sodar. The Doppler shift of the reflected radio waves depend on the speed of sound and hence on the temperature within the propagating Sodar pulses.
The RASS Extension for Sodar is easily integrated into an existing FAS Series Sodar Wind Profiler system. The vertical spacing of the temperature meaurements corresponds to the spacing of the vertical 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.
RASS Extension RAE2
for SFAS, MFAS, XFAS
The Scintec RAE2 RASS Extension upgrades any Sodar models (SFAS, MFAS or XFAS) to allow precise measurements of temperature profiles in the atmospheric boundary layer.
Reliable temperature measurement at all weather conditions
maximum range up to 600 / 800 / 1000 m (with SFAS/ MFAS / XFAS)
vertical resolution down to 5 / 10 / 20 m (with SFAS / MFAS / XFAS)
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.
robust wind measurement in both precipitation and turbulence-free atmospheres
immune to ground clutter and noise
maximum range up to 600 / 800 m (with SFAS / MFAS)
vertical resolution down to 5 / 10 m (with SFAS / MFAS)
Array Antenna With Low Sidelobes
The Scintec RAE2 and wind
RASS 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 Airport Applications
Security in aviation requires remote sensors to reliably measure even in unusual meteorological conditions. RASS systems are active devices that emit the radiation used for the measurement. In this way, RASS can reliably measure even rare and extreme cases of unusual vertical temperature distributions. This differs from radiometers which only receive natural thermal radiation and must derive temperature profiles using statistical methods. While radiometers can produce good RMS differences in the average, they fail in unusual cases.
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, unlike radiometers, allow RASS to measure in precipitation without performance degradation.
RASS systems are lifetime calibration-free. RASS derives temperature from relative changes in Doppler frequency which are determined digitally. Hence there is no calibration drift over weeks, months or years as known from radiometers.