Technical Papers


bookThanks to the strong collaboration between INFIBRA TECHNOLOGIES and Optical Fiber Sensors Group at the Institute TeCIP of Scuola Superiore Sant’Anna, the company R&D team is extremely active in publishing papers in both scientific journals and conferences. In particular, INFIBRA TECHNOLOGIES has been involved in numerous publications aimed to the introduction of advanced measurements technique based on Fiber Optic Sensor technologies, providing support through its own reading units and sensors as well as its expertise on the Optical Fiber Sensors deployment.



Source: Conference Paper OFS-24 (Post Deadline)

Authors: Y.Muanenda a, C. J. Oton a, S. Faralli a,b, T. Nannipieri a,b, A. Signorini a,b, F. Di Pasquale a,b
a Scuola Superiore Sant’Anna, via G. Moruzzi 1, 56124 Pisa, Italy
b INFIBRA TECHNOLOGIES S.r.l., Italy

Abstract: In this paper, we experimentally demonstrate a hybrid distributed acoustic and temperature sensor (DATS) based on Raman and coherent Rayleigh scattering processes in a standard singlemode fiber. A single commercial off-the-shelf DFB laser and a common receiver block are used to implement a highly integrated hybrid sensor system with key industrial applications. Distributed acoustic sensing and Raman temperature measurement are simultaneously performed by exploiting cyclic Simplex pulse coding in a phase-sensitive OTDR and in Raman DTS using direct detection. Suitable control and modulation of the DFB laser ensures inter-pulse incoherence and intra-pulse coherence, enabling accurate long-distance measurement of vibrations and temperature with minimal post-processing.

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Source: IEEE - Photonics Technology Letters

Authors: Iacopo Toccafondo a,b, Tiziano Nannipieri c, Alessandro Signorini c, Elisa Guillermain b, Jochen Kuhnhenn d, Markus Brugger b, Fabrizio Di Pasquale a,c
a Scuola Superiore Sant’Anna, via G. Moruzzi 1, 56124 Pisa, Italy
b CERN - European Organization for Nuclear Research, Switzerland
c INFIBRA TECHNOLOGIES S.r.l., Italy
d Fraunhofer-Institut Naturwissenschaftlich-Technische Trendanalysen (INT), Germany

Abstract: A field trial has been performed at the CERN High energy AcceleRator Mixed field facility (CHARM), newly developed for testing devices within accelerator representative radiation environments, to validate the use of Raman optical fiber sensors for temperature dependence correction in distributed dosimeters based on radiation induced attenuation in optical fibers. Experimental results demonstrate that Raman distributed temperature sensors, operating in loop configuration on radiation tolerant optical fibers, are robust to harsh environments in which a mixed field radiation, including protons, neutrons, photons and muons, is potentially altering the fiber material properties. The temperature profile measured on commercial radiation tolerant optical fibers is fully reliable and can then be used to correct the radiation induced attenuation temperature dependence in distributed radiation sensing systems based on Phosphorous-doped optical fibers.

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Source: Conference Paper OFS-24

Authors: Iacopo Toccafondo a,b, Tiziano Nannipieri c, Alessandro Signorini c, Elisa Guillermain b, Jochen Kuhnhenn d, Markus Brugger b, Fabrizio Di Pasquale a,c
a Scuola Superiore Sant’Anna, Italy
b CERN - European Organization for Nuclear Research, Switzerland
c INFIBRA TECHNOLOGIES S.r.l., Italy
d Fraunhofer-Institut Naturwissenschaftlich-Technische Trendanalysen (INT), Germany

Abstract: In this paper we present a validation of distributed Raman temperature sensing (RDTS) at the CERN high energy accelerator mixed field radiation test facility (CHARM), newly developed in order to qualify electronics for the challenging radiation environment of accelerators and connected high energy physics experiments. By investigating the effect of wavelength dependent radiation induced absorption (RIA) on the Raman Stokes and anti-Stokes light components in radiation tolerant Ge-doped multi-mode (MM) graded-index optical fibers, we demonstrate that Raman DTS used in loop configuration is robust to harsh environments in which the fiber is exposed to a mixed radiation field. The temperature profiles measured on commercial Ge-doped optical fibers is fully reliable and therefore, can be used to correct the RIA temperature dependence in distributed radiation sensing systems based on P-doped optical fibers.

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Company

INFIBRA TECHNOLOGIES Srl is engaged in designing and manufacturing of next-generation fiber optic sensors systems, while also offering engineering services. Energy, Oil & Gas, Transportation and Civil Engineering are our target markets, with solutions even suitable for harsh environments. Monitoring of temperature, vibration, deformation, or other chemical-physical parameters through a single optical fiber are our typical applications and FBGs, Raman, Brillouin and Rayleigh are our technologies.


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