Refractive index sensor based on fiber loop ring-down spectroscopy |
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Authors: | Xu Liu Chunyue Li Chengwu Zhao Yong Zhao Haifeng Hu |
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Affiliation: | 1. College of Information Science and Engineering, Northeastern University, Shenyang, China;2. State Key Laboratory of Synthetical Automation for Process Industries, Northeastern University, Shenyang, China |
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Abstract: | An optical fiber refractive index sensor based on fiber loop ring-down spectroscopy and a tapered fiber was fabricated using an ordinary single mode fiber with an arc fusion splicer. The performance of the sensor was controlled by the parameters of the tapered fiber. A fiber loop ring-down spectroscopy system was employed to enhance the sensitivity and demodulate the transmission spectrum. The results showed that a sensor with a waist diameter of 14 m and a length of 1.2 mm had good optical performance. By monitoring the ring-down time of the system, relatively high sensitivity of 411.576 s/ RIU was achieved with refractive index values from 1.333 to 1.412. This sensor offers few interferences, high sensitivity, easy fabrication, and low cost. |
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Keywords: | Fiber loop ring-down spectroscopy interferometer optical fiber sensor refractive index measurement tapered fiber |
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