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A simple optical fiber relative humidity (RH) sensor was proposed and demonstrated using a dumbbell-shaped inline Mach–Zehnder interferometer (IMZI) as a probe. The humidity sensor was constructed by coating the tapered waist region of the IMZI with ZnO nanowires. Based on an optical interferometric technique, the response of the sensor probe was examined by changing the RH within a range of 35%–60%...
In-line single-mode tapered-fiber Mach–Zehnder interferometer (MZI-SMTF) with average waist diameters ($d_{\textrm {avg}}$ ) of 4.05 and 2.89 $\mu \text{m}$ have been fabricated, and both the temperature and the humidity sensitivity of the surrounding media have been measured and compared. The humidity and the temperature were measured over the ranges from 0% to 90% and 28 °C to 40 °C, respectively...
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