Analysis of experimental results on the adulteration measurement by an etched fiber Bragg grating sensor
| Autor: | Ramakanta Mahakud, Sudhir K. Dixit, Om Prakash, Jitendra Kumar, Shankar V. Nakhe, Umesh Kumbhkar |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
business.industry Physics::Optics Grating Graded-index fiber Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Wavelength Double-clad fiber Optics Normalized frequency (fiber optics) Fiber Bragg grating Electrical and Electronic Engineering business Step-index profile Refractive index |
| Zdroj: | Optik. 126:5698-5702 |
| ISSN: | 0030-4026 |
| Popis: | This paper presents an analysis of the experimental results on the adulteration measurement of methanol content in ethyl alcohol by a HF etched fiber Bragg grating (EFBG). A minimum methanol concentration, down to 1% in ethyl alcohol, was measured. The sensitivity of the developed EFBG sensor was about 30 nm/refractive index unit (RIU). The minimum change in refractive index of 2 × 10 −4 was estimated. The experimental results are analyzed based on double clad approximation theory for cylindrical/rectangular waveguide geometry. A graphical method is used to find out the dependence of effective refractive index of the double clad fiber on cladding diameter and on surrounding refractive index. The change in Bragg wavelength, with surrounding medium refractive index, is estimated. It is observed that, for a particular clad diameter, the effective refractive index increased with increase in surrounding medium refractive index. The refractive index sensitivity was also higher for lower clad diameter grating. The theoretical analysis explained the experimental results very well. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect