RASS for FAS Sodars

Precise Temperature Measurements: The Scintec RAE1 Extension upgrades any Scintec Sodar SFAS, MFAS or XFAS to allow precise measurements of temperature profiles in the atmospheric boundary layer. The temperature values are retrieved using the so-called RASS technique, which stands for Radio-Acoustic Sounding System. RASS measures the speed of sound and derives the temperature therefrom. Speed of sound is measured by doppler analysis of the frequency of radiowaves which have been reflected at acoustic waves emitted by the sodar.
Wind Measurements in RASS Mode: As a major innovation, the Scintec windRASS™ can also perform wind measurements in radio-acoustic mode. This differs from conventional RASS where radio-acoustic sounding is used for temperature measurements only. With windRASS™, acoustic and electro-magnetic beams are emitted in vertical and tilted directions. The electromagnetic waves are backscattered at the acoustic waves and a Doppler analysis is performed. Now both, wind and temperature are derived via their influence on the speed of sound.
The Anywhere Anytime Profiler: As a result, windRASS™ is the first wind and temperature profiler that works anywhere, anytime. It is immune to ground clutter and ambient noise, making it a perfect solution for urban or industrial environments. Since windRASS™ does not depend on the existence of atmospheric turbulence, it operates at full performance in the marine boundary layer (coastal sites), foggy conditions or calm nights, each characterized by low turbulence levels. Note that windRASS™ is not compromised by precipitation. The windRASS™ Extension is available for Scintec Sodars SFAS and MFAS.
Ideal Tower Replacement: The RAE1 and windRASS™ can replace towers, tethered balloons or radiosondes at a fraction of the operational costs, even if precise temperature measurements are required. Measurement ranges exceed the height of towers in most cases. Compared to passive, thermal microwave techniques, RASS can precisely detect and locate even multiple inversions and has higher accuracy.
Extended-Sweep Inversion: The Extended-Sweep Inversion technique (ESI) of the RAE1 and the windRASS™ significantly increases the signal-to-noise ratio and allows for measurement ranges far wider than those of traditional RASS systems. windRASS™ is operated using APRun with extensive graphical display options and remote access support.
Powerful Operation Software: The RAE1 and windRASS™ Extensions are operated using the versatile software APRun with flexible configurability, extensive graphical display and output options, quality control features, statistical analysis tools and remote access support.

(c) Scintec AG 2018