Fig. 1. Structure diagram of sensor

Fig. 2. Comparison of transmission spectra of dual channel sensor

Fig. 3. Optical fiber fabrication steps for dual channel sensing. (a) Structure diagram of MMF-TCF-MMF; (b) structure diagram of channel 1; (c) structure diagram of Ag + ITO plating on TCF; (d) structure diagram of channel 2; (e) structure diagram of dual channel fiber

Fig. 4. Experimental test device diagram

Fig. 5. Temperature response characteristics of cascaded sensors in air. (a) Transmission diagram of resonant wavelength of channel 2 as a function of temperature; (b) linear fitting diagram of resonant wavelength variation with temperature in channel 2

Fig. 6. Experimental diagram of dual channel sensing. (a) RI test in a range from 1.333 to 1.357 RIU; (b) linear fit in RI test; (c) temperature test in a range from 40 to 80 ℃; (d) linear fit in temperature test

Fig. 7. Test diagram of sensing matrix