The Scintec BLS450 Large Aperture Scintillometer measures atmospheric turbulence and heat flux over path lengths between 100 m (with Path Reduction Aperture, otherwise 500 m) and 6000 m. As part of a meteorological station it can also be used to determine the evapotranspiration over extended areas.
A scintillometer senses turbulence between an optical transmitter and a receiver. The operation principle is based on the modulation of light by atmospheric refractive index fluctuations in the air. The phenomenon is called scintillation and is the reason why stars twinkle at night.
Compared to conventional turbulence measurements with point sensors, scintillometers gather spatially representative results with lower statistical scatter and shorter averaging times. As a double-ended remote sensing system, scintillometers also allow access to terrains like forest or water without need to install in-situ sensors.
Unlike other large aperture scintillometers, the Scintec BLS Series uses LED arrays which produce wide emission angles. The wide emission angle virtually eliminates the need for transmitter alignment and provides more accurate measurement results. In addition, it facilitates the use on towers which are often prone to vibration.