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Appl. Sci. 2018, 8(7), 1137; https://doi.org/10.3390/app8071137

A Running Reference Analysis Method to Greatly Improve Optical Backscatter Reflectometry Strain Data from the Inside of Hardening and Shrinking Materials

Department of Mechanical and Industrial Engineering, NTNU, Norwegian University of Science and Technology, Richard Birkelands vei 2b, 7024 Trondheim, Norway
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Received: 25 May 2018 / Revised: 10 July 2018 / Accepted: 11 July 2018 / Published: 13 July 2018
(This article belongs to the Section Mechanical Engineering)
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Abstract

Due to the increasing ease of use and the superiority of the results, distributed strain measurements, utilizing Optical Backscatter Reflectometry (OBR), have become more important and widespread over the last few years. Strains are calculated from the difference between an actual optical Raleigh backscattering measurement and an initial reference value. However, under certain physical conditions, e.g., pinching or microbending of the optical fiber, no meaningful strain values are yielded by the commonly-used method to analyze OBR data. Such conditions were experienced in this study where the optical fiber was embedded into hardening epoxy for measuring shrinkage due to curing. In this work, it is shown that a new data analysis method called the “running reference analysis method” can overcome such obstacles and deliver meaningful strain values in circumstances in which the traditional method fails. In the new approach, each measurement is compared to the previous measurement, and the strain differences are added up to the absolute strain value. This method does not require a new experimental technique and will also work on old measurement files. It is also useful for other types of (OBR) strain measurements that contain many outliers and is not restricted to the investigation of cured epoxy. View Full-Text
Keywords: Optical Backscatter Reflectometry; OBR; strain measurements; running reference; epoxy; cure; in-situ Optical Backscatter Reflectometry; OBR; strain measurements; running reference; epoxy; cure; in-situ
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Heinze, S.; Echtermeyer, A.T. A Running Reference Analysis Method to Greatly Improve Optical Backscatter Reflectometry Strain Data from the Inside of Hardening and Shrinking Materials. Appl. Sci. 2018, 8, 1137.

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