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Compensation Method for Temperature Cross-sensitivity in Transverse Force Applications with FBG Sensors in POFs

LEAL-JUNIOR, A. ; Theodosiou, A. ; Marques, C. ; Pontes, M. J. Pontes ; Kalli, K. ; Frizera-Neto, A. Frizera-Neto

Journal of Lightwave Technology Vol. 36, Nº 17, pp. 3660 - 3665, September, 2018.

ISSN (print): 0733-8724
ISSN (online):

Journal Impact Factor: 2,567 (in 2015)

Digital Object Identifier: 10.1109/JLT.2018.2848704

In this paper, we investigate the influence of
temperature on the transverse force response of polymer optical fiber Bragg gratings (POFBGs) inscribed in cyclic transparent fluoropolymers (CYTOPs). The gratings are imprinted in the fiber using the direct-write, plane-by-plane femtosecond laser inscription method. The temperature increase leads to a decrease in the polymer Young’s modulus, which causes a sensitivity
variation in the POFBG sensor for transverse force applications. The proposed technique is based on the characterization of both
the sensor’s response offset and the material’s Young’s modulus variation due to the temperature increase. Transverse force tests were performed at different temperatures (30°C, 40°C, 50°C and 60°C) and the compensated and uncompensated responses are compared in terms of root mean squared error (RMSE). The compensated results shown a RMSE lower than 3% (mean value between all tested temperatures), which is 6.7 times lower
compared with the uncompensated response. In addition, the proposed compensation technique presents a maximum RMSE reduction of 16 times at 60°C.