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Electrical and electronic engineering
An all-fiber refractive index sensor with a simple configuration is proposed and investigated. The proposed fiber refractometer consists of a full-loop structure of bare high-bend loss singlemode fiber-1060XP, employing the well-known whispering gallery mode (WGM) effect induced by the evanescent wave excitation to measure the refractive index of an external medium. A competitive sensitivity is achieved (average 725.76nm/RIU at a bend diameter of 19.3mm) compared with other fiber-optic sensors, plus benefits resulting from simplicity, low cost and ease of fabrication.
Wang, P., Semenova, Y., Li, Y., Wu, Q., Farrell, G.: A Macrobending Singlemode Fiber Refractive Index Sensor for Low Refractive Index Liquids. Photonics Letters of Poland, Vol. 2 (2),2010, pp. 67-69.