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Journal of Sensors and Sensor Systems An open-access peer-reviewed journal
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Volume 7, issue 1
J. Sens. Sens. Syst., 7, 91-100, 2018
https://doi.org/10.5194/jsss-7-91-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue: Sensor/IRS2 2017

J. Sens. Sens. Syst., 7, 91-100, 2018
https://doi.org/10.5194/jsss-7-91-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular research article 21 Feb 2018

Regular research article | 21 Feb 2018

Combined distributed Raman and Bragg fiber temperature sensing using incoherent optical frequency domain reflectometry

Max Koeppel1,5, Stefan Werzinger1, Thomas Ringel1,2, Peter Bechtold2, Torsten Thiel3, Rainer Engelbrecht4, Thomas Bosselmann2, and Bernhard Schmauss1,5 Max Koeppel et al.
  • 1Institute of Microwaves and Photonics, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Cauerstr. 9, 91058 Erlangen, Germany
  • 2Siemens AG, Corporate Technology, Guenther-Scharowsky-Str. 1, 91050 Erlangen, Germany
  • 3Advanced Optics Solutions GmbH (AOS), Overbeckstr 39a, 01139 Dresden, Germany
  • 4Polymer Optical Fiber Application Center, Technische Hochschule Nürnberg Georg Simon Ohm, 90489 Nuremberg, Germany
  • 5SAOT Erlangen Graduate School In Advanced Optical Technologies, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Paul-Gordan-Str. 6, 91052 Erlangen, Germany

Abstract. Optical temperature sensors offer unique features which make them indispensable for key industries such as the energy sector. However, commercially available systems are usually designed to perform either distributed or distinct hot spot temperature measurements since they are restricted to one measurement principle. We have combined two concepts, fiber Bragg grating (FBG) temperature sensors and Raman-based distributed temperature sensing (DTS), to overcome these limitations. Using a technique called incoherent optical frequency domain reflectometry (IOFDR), it is possible to cascade several FBGs with the same Bragg wavelength in one fiber and simultaneously perform truly distributed Raman temperature measurements. In our lab we have achieved a standard deviation of 2.5K or better at a spatial resolution in the order of 1m with the Raman DTS. We have also carried out a field test in a high-voltage environment with strong magnetic fields where we performed simultaneous Raman and FBG temperature measurements using a single sensor fiber only.

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Optical temperature sensors offer unique features which make them indispensable for key industries such as the energy sector. However, commercially available systems are designed to perform either distributed or hot spot temperature measurements. We have combined two measurement concepts to overcome this limitation, which allow distributed temperature measurements to be performed simultaneously with read-outs of optical hot spot temperature sensors at distinct positions along a fiber.
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