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. 2022 Jul 18;22(14):5363. doi: 10.3390/s22145363

Figure 7.

Figure 7

Schematic diagram of (a) PDMS-coated FBG [126]. (b) Semi-coated FBG [127]. (c) Encapsulation method of FPI sensors [131]. (d,e) Encapsulation method of MMZI sensors [62,133].