Abstract
A fiber-optic sensor that simultaneously measures relative humidity (RH) and temperature (T) based on a microfiber Sagnac loop (MSL) and MoS2 nanosheets is proposed. The MSL is made from a microfiber coupler fabricated by hydrogen-oxygen flame heating technology. The sensor responses to RH and T are investigated by theoretical and experimental analyses. In our experiments, the RH sensitivities achieved are 176.6 pm/%RH for the wavelength shift and −0.017 dB/%RH for the intensity in the range from 60.6 to 78.6%RH, and the T sensitivities are −123.5 pm/°C and −0.079 dB/°C. The proposed sensor has potential applications in the simultaneous measurement of RH and T.
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