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Journal of Sensors
Volume 2016 (2016), Article ID 7073619, 10 pages
http://dx.doi.org/10.1155/2016/7073619
Research Article

Identifying and Correcting Step Losses in Single-Ended Fiber-Optic Distributed Temperature Sensing Data

1Division of Hydrologic Sciences, Desert Research Institute, 755 East Flamingo Road, Las Vegas, NV 89119, USA
2Department of Geological Sciences and Engineering, University of Nevada, Reno, MS 172, Reno, NV 89557, USA

Received 22 December 2015; Accepted 17 March 2016

Academic Editor: Kewei Zhang

Copyright © 2016 Mark B. Hausner and Scott Kobs. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Fiber-optic distributed temperature sensing (DTS) makes it possible to observe temperatures on spatial scales as fine as centimeters and at frequencies up to 1 Hz. Over the past decade, fiber-optic DTS instruments have increasingly been employed to monitor environmental temperatures, from oceans to atmospheric monitoring. Because of the nature of environmental deployments, optical fibers deployed for research purposes often encounter step losses in the Raman spectra signal. Whether these phenomena occur due to cable damage or impingements, sharp bends in the deployed cable, or connections and splices, the step losses are usually not adequately addressed by the calibration routines provided by instrument manufacturers and can be overlooked in postprocessing calibration routines as well. Here we provide a method to identify and correct for the effects of step losses in raw Raman spectra data. The utility of the correction is demonstrated with case studies, including synthetic and laboratory data sets.