Patent ID: 11860147
Assignee: UNIVERSITA' DI PISA
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 7:
8. A method for determining the real evapotranspiration of a vegetated surface of a soil by a device, the method comprising:
a porous evaporator, at least one portion of which has resistance to a water vapor flow depending on a parameter of the porous evaporator, the porous evaporator having an upper surface exposed to the atmosphere,
a tank of liquid water underlying the porous evaporator to which the tank is connected by a suction tube, and provided with a meter for measuring water level,
a sensor for measuring a soil humidity value, and
a CPU that controls the parameter on which the resistance to the water vapor flow through the porous evaporator depends, in dependence on the soil humidity value detected by the sensor,
wherein evapotranspiration is calculated by the CPU from a decrease in the water level in the tank detected by the meter, the decrease being an index of the water vapor flow through the porous evaporator.