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LAS ET
Main features :
- Proven Kipp & Zonen Large Aperture Scintillometer technology
- Path integrated measurement over distances from 250 m to 8 km
- Complete and simple to use systems, ready to install
- EVATION software calculates heat fluxes and evapo-transpiration
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 The LAS Basic Evapo-Transpiration (BET) and the LAS Radio Evapo-Transpiration (RET) systems use scintillometer technology for surface flux monitoring. Kipp & Zonen ET systems are specifically designed for earth energy balance studies, water and crop management and for ground-truth validation of satellite remote sensing measurements.
The most unique feature is the line of sight path-integrating capability of the LAS / XLAS scintillometers. This allows the user to measure area-averaged surface fluxes of sensible heat at scales of 250 m to 8 km, over both homogenous and moderately heterogeneous areas.
The LAS-BET and LAS-RET give the same outputs, sensible heat and evaporation, but differ in complexity and flexibility. The LAS-BET comprises a LAS, a number of meteorological sensors, a data logger and a software package. A meteorological mast is available as an accessory. The data logger collects the signals from all the sensors and from the LAS. The LAS receiver and the sensors must be located at the same site as the data logger because of cable length restrictions.
The scintillation strength (expressed as CnČ) measured by the LAS, together with the air temperature, wind speed, air pressure, net radiation (from an NR-Lite) and soil heat data, are processed by EVATION software to provide the sensible and latent heat fluxes.
 To improve flexibility, especially the site selection of the LAS and the meteorological sensors, the LAS-RET system is equipped with a 2.4 GHz (license free) radio link. The RF link transmits the data from the LAS to the data logger of the meteorological station. This station comprises sensors, a 4 m mast, a data logger, a battery and solar panel. The RF link allows the user to place the meteorological station up to 5 km away from the LAS, preferably near the centre of the LAS path or at a suitable and representative location.
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