Sıvılarda kırılma indisi ölçümü amacıyla uzun periyotlu fiber ızgara sensörlerin uygulaması

Abstract

Refractive index (RI) is one of the important optical parameters which is unique for each material. Increased public awareness and legal requirements for quality standards in different areas have created a need for reliable, fast, automated, remote and/or portable refractive index sensors with multi-measurement capability. Fiber-based RI sensors are very good candidates in providing attractive solutions in such application areas and have been attracting a growing interest by the scientific community. In this work, an intrinsic fiber optic refractive index sensor has been investigated. It uses a long-period fiber grating (LPFG) and an Optical Spectrum Analyzer (OSA), as sensor head and interrogator unit, respectively. New measurements of refractive indices of common solvents and solutions at low-loss telecom wavelengths have been successfully demonstrated by using the proposed sensor. The reported measurement results are in excellent agreement with our simulation results and reference measurements realized by conventional measurement techniques.