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. 2018 Mar 23;7:17161. doi: 10.1038/lsa.2017.161

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Copyright © 2018 The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Wavelength and peak power fluctuations during temperature and humidity cycling. The temperature profile was set between 20 and 50 °C. Each cycle consists of 2 h for stabilization at 20 and 50 °C and 2 h for the increase and decrease between the two temperatures, which totalled 8 h. The results of 10 cycles are recorded for (a) 10 s FBG, (b) 0.2 s FBG and (c) 7 ms FBG. The results for 10 humidity cycles between 40%RH and 100%RH at a constant temperature of 40 °C are shown in d. Each cycle consists of 2 h for stabilization at each humidity level and 2 h for the increase and decrease between the stated levels. For all of the graphs, only the first two and last three cycles are plotted, with the dash line representing the missing cycles.