eprintid: 13165 rev_number: 16 eprint_status: archive userid: 1903 dir: disk0/00/01/31/65 datestamp: 2012-10-30 12:06:36 lastmod: 2016-04-21 12:28:50 status_changed: 2012-10-30 12:06:36 type: conference_item metadata_visibility: show item_issues_count: 0 creators_name: Gil Rodríguez, María creators_name: Rodríguez Sinobas, Leonor creators_name: Benitez Buelga, Javier creators_name: Sánchez Calvo, Raúl creators_name: Juana Sirgado, Luis creators_name: Castañon Lion, Guillermo creators_name: Laguna Peñuelas, Francisco title: Use of DFOT Heat Pulse Method ForWetting Pattern Determination in Drip Irrigation Emitters ispublished: pub subjects: agricultura abstract: 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 fiber 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 fiber. A laser pulse, generated by the DTS unit, traversing a fiber optic cable will result in backscatter at two frequencies. The DTS quantifies 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 reflected, computed from the time of travel for the light. date: 2011 date_type: published publisher: Copernicus official_url: http://meetingorganizer.copernicus.org/EGU2011/EGU2011-13158.pdf full_text_status: public pres_type: other volume: 13 place_of_pub: Alemania pagerange: 0-0 event_title: 8th EGU General Assembly, EGU 2011 event_location: Viena, Austria event_dates: 04/04/2011 - 06/07/2012 event_type: conference institution: Agronomos department: Ingenieria_Rural refereed: TRUE book_title: Geophysical Research Abstracts of 8th EGU General Assembly rights: by-nc-nd citation: Gil Rodríguez, María and Rodríguez Sinobas, Leonor and Benitez Buelga, Javier and Sánchez Calvo, Raúl and Juana Sirgado, Luis and Castañon Lion, Guillermo and Laguna Peñuelas, Francisco (2011). Use of DFOT Heat Pulse Method ForWetting Pattern Determination in Drip Irrigation Emitters. In: "8th EGU General Assembly, EGU 2011", 04/04/2011 - 06/07/2012, Viena, Austria. pp.. document_url: https://oa.upm.es/13165/1/INVE_MEM_2011_109805.pdf