TY  - CONF
T2  - 8th EGU General Assembly, EGU 2011
CY  - Alemania
VL  - 13
UR  - http://meetingorganizer.copernicus.org/EGU2011/EGU2011-13158.pdf
Y1  - 2011///
A1  - Gil Rodríguez, María
A1  - Rodríguez Sinobas, Leonor
A1  - Benitez Buelga, Javier
A1  - Sánchez Calvo, Raúl
A1  - Juana Sirgado, Luis
A1  - Castañon Lion, Guillermo
A1  - Laguna Peñuelas, Francisco
AV  - public
M2  - Viena, Austria
TI  - Use of DFOT Heat Pulse Method ForWetting Pattern Determination in Drip Irrigation Emitters
N2  - Although there are numerous accurate measuring methods to determine soil moisture content in a spot, until very recently there were no precise in situ and in real time methods that were able to measure soil moisture content along a line. By means of the Distributed Fiber Optic Temperature Measurement method or DFOT, the temperature in 0.12 m intervals and long distances (up to 10,000 m) with a high time frequency and an accuracy of +0.2º C is determined. The principle of temperature measurement along a ?ber optic cable is based on the thermal sensitivity of the relative intensities of backscattered photons that arise from collisions with electrons in the core of the glass ?ber. A laser pulse, generated by the DTS unit, traversing a ?ber optic cable will result in backscatter at two frequencies. The DTS quanti?es the intensity of these backscattered photons and elapsed time between the pulse and the observed returned light. The intensity of one of the frequencies is strongly dependent on the temperature at the point where the scattering process occurred. The computed temperature is attributed to the position along the cable from which the light was re?ected, computed from the time of travel for the light.
ID  - upm13165
PB  - Copernicus
ER  -