Real-time distributed temperature gradient sensing using amplitude-based C-OTDR and sensing fiber with inscribed scattering dots

K. Hicke; S. Chruscicki; K. Krebber

doi:10.1117/12.2539925

28 August 2019 Real-time distributed temperature gradient sensing using amplitude-based C-OTDR and sensing fiber with inscribed scattering dots

K. Hicke, S. Chruscicki, K. Krebber

Author Affiliations +

Proceedings Volume 11199, Seventh European Workshop on Optical Fibre Sensors; 1119920 (2019) https://doi.org/10.1117/12.2539925
Event: Seventh European Workshop on Optical Fibre Sensors, 2019, Limassol, Cyprus

Abstract

We present a technique for distributed temperature gradient sensing in real-time along an optical fiber utilizing simple amplitude-based direct-detection coherent optical time domain reflectometry (C-OTDR) and a special sensing fiber. Our technique enables us to determine phase changes or low-frequency variations of the C-OTDR signal stemming from temperature variations. The distinct feature of the used sensing fiber is its structuring with equidistant strongly scattering dots. Consecutive pairs of these scatterers form the dominant local interferometers, effectively overwriting the otherwise highly nonlinear transfer function of common optical fiber. This enables a quasi-phase-resolved evaluation of perturbation responses originating from temperature changes at sensor positions between the scatterers. Using our method, we show the measurement of a nonlinear temperature transient from a heating process with a maximum temperature gradient of 0.8°C over 20 s and a total temperature increase of 28.4°C. This method requires almost no post-processing and can be used for simultaneous distributed vibration sensing (DVS) and quantification of local temperature gradients in a single fiber, e.g., for the use in condition monitoring of infrastructure or industrial installations.

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K. Hicke, S. Chruscicki, and K. Krebber "Real-time distributed temperature gradient sensing using amplitude-based C-OTDR and sensing fiber with inscribed scattering dots", Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 1119920 (28 August 2019); https://doi.org/10.1117/12.2539925

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KEYWORDS

Temperature metrology

Scattering

Interferometers

Backscatter

Phase shifts

Sensors

Structured optical fibers

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