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2015
Journal Article
Titel
Raman distributed temperature sensing at CERN
Abstract
A field trial has been performed at the CERN high-energy accelerator-mixed (CHARM) field facility, newly developed for testing devices within accelerator representative radiation environments, to validate the use of Raman-based optical fiber sensors for distributed temperature measurements in highly radiative environments. Experimental results demonstrate that Raman distributed temperature sensors, operating in loop configuration on radiation-tolerant optical fibers, are able to compensate for wavelength-dependent losses and are, therefore, robust to harsh environments, in which a mixed-field radiation, including protons, neutrons, photons, and other particles, is potentially altering the fiber material properties. The temperature profile measured on commercial radiation-tolerant optical fibers shows that a temperature resolution <;1 °C, 0.5-m spatial resolution, is highly reliable and sets the first step toward a distributed measurement system able to monitor the temperature at the CERN's large hadron collider for safety purposes. Such a system will also be helpful in correcting the radiation-induced attenuation temperature dependence in distributed radiation sensing systems based on radiation-sensitive optical fibers.
Author(s)
Toccafondo, Iacopo
Department of Engineering, European Organization for Nuclear Research, Geneva, Switzerland
Guillermain, Elisa
Department of Engineering, European Organization for Nuclear Research, Geneva, Switzerland
Brugger, Markus
Department of Engineering, European Organization for Nuclear Research, Geneva, Switzerland