The Impact of Optical Fiber Type on the Temperature Measurements in Distributed Optical Fiber Sensor Systems

eng Article in English DOI: 10.14313/PAR_249/27

Mateusz Łakomski *, Mateusz Plona *, Bartłomiej Guzowski *, send Iyad S.M. Shatarah ** * Department of Semiconductor and Optoelectronic Devices, Lodz University of Technology, Politechniki Ave. 10, 93-590 Lodz, Poland ** Institute of Electronics, Lodz University of Technology, Politechniki Ave. 10, 93-590 Lodz, Poland

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Abstract

This paper presents the capabilities of using distributed optical fiber sensors to obtain the temperature profile of an optical path made of silica telecom optical fiber. The impact of the optical fiber type on the temperature measurements is also observed. Two types of optical fibers are tested: standard G.652.D and low-loss G.654.C. DOFS systems for temperature measurements are based on the phenomenon of Raman or Brillouin backscattering. In case of Brillouin-based systems, the spectral properties depend on the type of optical fiber and its parameters. The Brillouin frequency shift depends on the temperature around the fiber, as well as the strain applied to the optical fiber. The presented results show that temperature coefficient can also vary depending on the optical fiber type. For the standard G.652.D optical fiber, the temperature coefficient equals 1.12 MHz/°C and 1.14 MHz/°C depending on the tracked peaks, while for the low-loss G.654.C fiber it equal 1.4 MHz/°C.

Keywords

Brillouin scattering, DOFS, optical fiber, OTDR

Wpływ typu światłowodu na pomiar temperatury w systemach rozłożonych czujników światłowodowych

Streszczenie

W artykule przedstawiono możliwości wykorzystania rozłożonych czujników światłowodowych do uzyskania rozkładu temperatury wzdłuż toru optycznego wykonanego z telekomunikacyjnego włókna światłowodowego. Obserwowany jest również wpływ rodzaju włókna światłowodowego na pomiary temperatury. Przetestowano dwa rodzaje włókien światłowodowych: standardowe G.652.D oraz o niskiej stratności G.654.C. Systemy DOFS do pomiarów temperatury wykorzystują zjawisko wstecznych rozpraszania Ramana lub Brillouina. W przypadku systemów bazujących na zjawisku Brillouina, właściwości spektralne zależą od rodzaju włókna optycznego oraz jego parametrów. Przesunięcie częstotliwości Brillouina zależy od temperatury wokół włókna oraz nałożonego na włókno naprężenia. Przedstawione wyniki pokazują, że współczynnik temperaturowy może również różnić się w zależności od rodzaju włókna optycznego. Dla standardowego włókna światłowodowego G.652.D, współczynnik temperaturowy wynosi 1,12 MHz/°C lub 1,14 MHz/°C w zależności od śledzonych szczytów, podczas gdy dla włókna o niskiej stratności G.654.C wynosi 1,4 MHz/°C.

Słowa kluczowe

DOFS, OTDR, rozpraszanie Brillouina, światłowód

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