Archive > Volume 18 Issue 6 > 2022,18(6):321-325. DOI:https://doi.org/10.1007/s11801-022-1153-3 CSTR:[cstr] Prev Next
Refractive index and temperature optical fiber sensor based on thin core S-taper and spherical structure
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Abstract:
A Mach-Zehnder interferometer (MZI) for simultaneously measuring refractive index (RI) and temperature is proposed and verified in this paper. The sensor head is composed of thin core fiber (TCF) S-taper structure and spherical structure. By monitoring two interference dips, experimental results show that the RI sensitivities are −70.392 nm/RIU and −60.08 nm/RIU in the RI range of 1.338 4—1.350 0, respectively. And the temperature sensitivities are 0.050 72 nm/°C and 0.071 7 nm/°C in the temperature range of 30—70 °C, respectively. The simultaneous measurement of the temperature and external RI is demonstrated based on the sensitive matrix. The sensor also has the advantages of low cost, simple structure and high sensitivity.
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