Journal cover Journal topic
Journal of Sensors and Sensor Systems An open-access peer-reviewed journal
J. Sens. Sens. Syst., 7, 85-90, 2018
https://doi.org/10.5194/jsss-7-85-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Regular research article
20 Feb 2018
Temperature sensing in underground facilities by Raman optical frequency domain reflectometry using fiber-optic communication cables
Markus Brüne1, Wilhelm Furian2, Wieland Hill3, and Andreas Pflitsch1,2 1Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany
2Humboldt-Universität zu Berlin, Unter den Linden 6, 10099 Berlin, Germany
3NKT Photonics GmbH, Schanzenstraße 39, Building D9–D13, 51063 Cologne, Germany
Abstract. Gaining information on climatic conditions in subway tunnels is the key to predicting the propagation of smoke or toxic gases in these infrastructures in the case of a fire or a terrorist attack. As anemometer measurements are not economically suitable, the employment of alternative monitoring methods is necessary. High-resolution temperature sensing with Raman optical frequency domain reflectometry (OFDR) using optical communication fiber cables shows great potential as it allows the surveillance of several kilometers of underground transport facilities without the need for installing sensing equipment in the tunnels. This paper presents first results of a study using this approach for monitoring subway tunnels. In the Berlin subway, temperature data gathered from newly installed as well as pre-installed communication cables were evaluated and compared to reference data from temperature loggers. Results are very promising as high correlations between all data can be achieved showing the potential of this approach.

Citation: Brüne, M., Furian, W., Hill, W., and Pflitsch, A.: Temperature sensing in underground facilities by Raman optical frequency domain reflectometry using fiber-optic communication cables, J. Sens. Sens. Syst., 7, 85-90, https://doi.org/10.5194/jsss-7-85-2018, 2018.

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The climate conditions in underground transportation facilities, especially the current airflow in terms of direction and speed, are the key factor driving smoke propagation in the case of a tunnel fire. Sensing this airflow is cost-intensive. Therefore, this paper focuses on gaining the information from temperature sensing along the tunnels using already installed optical fibers normally used for communications. This technique can replace thousands of temperature sensors.
The climate conditions in underground transportation facilities, especially the current airflow...
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