A Highly Sensitive Fiber Optic Sensor Based on Two-Core Fiber for Refractive Index Measurement

作者：Rafael Guzman Sepulveda Jose; Guzman Cabrera Rafael; Torres Cisneros Miguel; Javier Sanchez Mondragon Jose; Alberto May Arrioja Daniel

来源：Sensors, 2013, 13(10): 14200-14213.

DOI：10.3390/s131014200

• fiber optic sensor
• refractive index sensor
• two-core fiber

A simple and compact fiber optic sensor based on a two-core fiber is demonstrated for high-performance measurements of refractive indices (RI) of liquids. In order to demonstrate the suitability of the proposed sensor to perform high-sensitivity sensing in a variety of applications, the sensor has been used to measure the RI of binary liquid mixtures. Such measurements can accurately determine the salinity of salt water solutions, and detect the water content of adulterated alcoholic beverages. The largest sensitivity of the RI sensor that has been experimentally demonstrated is 3,119 nm per Refractive Index Units (RIU) for the RI range from 1.3160 to 1.3943. On the other hand, our results suggest that the sensitivity can be enhanced up to 3485.67 nm/RIU approximately for the same RI range.

• 出版日期2013-10