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. 2021 Dec 1;21(23):8049. doi: 10.3390/s21238049

Figure 28.

Figure 28

Point sensor. (i) (a) Schematic of tapered fiber. (b) Photograph of the packaged sensor. (c) Microscope image of the microsphere. (ii) Experimental setup. (iii) (a) RH vs. power variation over time. (b) Hysteresis graph. Adapted with permission from ref. [139]. Copyright 2018 Elsevier.