Sıvılarda kırılma indisi ölçümü amacıyla uzun periyotlu fiber ızgara sensörlerin uygulaması

Abstract

Keywords

• Algılayıcı,fiber optik

IMPLEMENTATION OF LONG-PERIOD FIBER GRATINGS FOR REFRACTIVE INDEX MEASUREMENT OF LIQUIDS

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.

Keywords

• Sensors,optics

References

1. [1] Alvarez-Herrero A, Guerrero H, Levy D. High-sensitivity sensor of low relative humidity based on overlay on side-polished fibers. IEEE, Sens J 2004; 4 (1): 52-56.
2. [2] Caucheteur C. Realization of mechanical and chemical sensors based on the fiber Bragg gratings technology, PhD, Faculté polytechnique de Mons, Mons, Belgium, 2007.
3. [3] Caucheteur, C, Tuan G, Fu, Bai-Ou G, Jacques A. Ultrasensitive plasmonic sensing in air using optical fibre spectral combs. Nature Comm 2016; 7 (13371).
4. [4] Del Villar I. Ultrahigh-sensitivity sensors based on thin-film coated long period gratings with reduced diameter, in transition mode and near the dispersion turning point. Opt Express 2015; 23 (7): 8389-8398.
5. [5] Coelho L, Viegas D, Santos JL, de Almeida JMMM. Characterization of zinc oxide coated optical fiber long period gratings with improved refractive index sensing properties. Sens Actuators B Chem 2016; 223 (0925-4005): 45-51.
6. [6] Coelho L, Viegas D, Santos JL, de Almeida JMMM. Enhanced refractive index sensing characteristics of optical fibre long period grating coated with titanium dioxide thin films. Sens Actuators B Chem 2014; 202 (0925-4005): 929-934.
7. [7] Garg R, Tripathi SM, Thyagarajan K, Bock W. J. Long period fiber grating based temperature-compensated high performance sensor for bio-chemical sensing applications. Sens Actuators B 2014, 176: 1121-1127.
8. [8] Erdogan, T. Cladding-mode resonances in short- and long-period fiber grating filters. J Opt Soc Am A 1997; 14 (8): 1760-1773.

9. [9] Lee BH, Liu Y, Lee SB, Choi SS, Jang JN. Displacements of the resonant peaks of a long-period fiber grating induced by a change of ambient refractive index. Opt Lett 1997; 22 (23): 1769-1771.
10. [10] Hou R, Ghassemlooy Z, Hassan A, Lu C, Dowker KP. Modelling of long-period fibre grating response to refractive index higher than that of cladding. Meas Sci Technol 2001; 12 (10): 1709-1713.
11. [11] Vengsarkar AN, Lemaire PJ, Judkins JB, Bhatia V, Erdogan T, Sipe JE. Long-period fiber gratings as band-rejection filters. J Lightw Technol 1996; 14 (1): 58-65.
12. [12] Erdogan, T. Fiber grating spectra. J Lightw Technol 1997; 15 (8): 1277-1294.
13. [13] Van Brakel A. Sensing characteristics of an optical fibre long-period grating Michelson refractometer. PhD, Rand Afrikaans University, Johannesburg, South Africa, 2004.
14. [14] Marcuse D, Gloge D, Marcatili EA. Guiding properties of fibres. Optical fiber telecommunications. New York: Academic Press, 1979.
15. [15] Jones WB. Introduction to Optical Fiber Communications Systems. UK: Oxford University Press, 1995.
16. [16] Marcuse D. Theory of Dielectric Optical Waveguides. 2nd ed. New York, USA: Academic Press, 1991.
17. [17] Arc-Induced Long Period Gratings: Analysis of the Fabrication Parameters on the Surrounding Refractive Index Sensitivity, In book: Advances in Optical Science and Engineering, Springer (DOI: 10.1007/978-981-10-3908-9_43), Singapore, 2017.
18. [18] Lacraz A., Theodosiou A., Kalli K., Femtosecond laser inscribed Bragg grating arrays in long lengths of polymer optical fibres; a route to practical sensing with POF, Electronics Letter, DOI: 10.1049/el.2016.2238, August 2016