A compact in-fiber refractive index （RI） sensor based on a step index multimode polymer optical fiber with a micro-hole drilled by a miniature numerical control machine is presented. A good linear relationship betwe...A compact in-fiber refractive index （RI） sensor based on a step index multimode polymer optical fiber with a micro-hole drilled by a miniature numerical control machine is presented. A good linear relationship between the transmission and RI over a large operating range from 1.335 to 1.475 and a sensitivity of 36 071.43 mV/RIU （RI unit） are found. The relationship between the transmission and the RI of the hole depends on the micro-hole＇s diameter and depth. The RI sensor developed in this letter is low-cost, easily fabricated, and capable of continuous measurement.展开更多
基金supported by the National "973" Program of China(No.2011CB921603)the National Natural Science Foundation of China(No.11074097)
文摘A compact in-fiber refractive index （RI） sensor based on a step index multimode polymer optical fiber with a micro-hole drilled by a miniature numerical control machine is presented. A good linear relationship between the transmission and RI over a large operating range from 1.335 to 1.475 and a sensitivity of 36 071.43 mV/RIU （RI unit） are found. The relationship between the transmission and the RI of the hole depends on the micro-hole＇s diameter and depth. The RI sensor developed in this letter is low-cost, easily fabricated, and capable of continuous measurement.
