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. Author manuscript; available in PMC: 2018 Jun 1.
Published in final edited form as: IEEE Sens J. 2017 Apr 18;17(11):3526–3541. doi: 10.1109/JSEN.2017.2694965

Fig. 9.

Fig. 9

Thermal drift in lateral (a) and axial (b) FBG sensor readings during 4 test sessions each spanning a period of 225 minutes. (c) The Bragg wavelength shift in the axial FBG sensor shows a linear correlation with the common mode (average Bragg wavelength shift) of lateral FBG sensors with a proportionality constant of κ = 0.92.