Abstract
An optical fiber sensor based on a structural modulated ultralong period microfiber grating (SULPMG) for the simultaneous measurement of the refractive index and temperature within a low-refractive-index (RI) range is experimentally demonstrated. By using the arc discharge method followed by hydrogen-oxygen flame drawing technology, an SULPMG with a small waist diameter provides a strong evanescent field. The results show that a sensitivity as high as 2418.6 nm/RIU and −561.4 dB/RIU can be achieved in the low-RI range from 1.3359 to 1.3402. An experimental temperature sensitivity of approximately −0.145 nm/°C can be achieved over an ambient temperature range of 30–80 °C. The theoretical analysis and experimental results are consistent. The proposed sensor with an outstanding response to a low RI can be applied to research in the chemical analysis and biomedical fields.
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