Reference for citation: Zenevich А. O., Mansurov T. M., Kovalenko T. G. Novikov E. V., Zhdanovich S. V. Identification of liquids and determination of aqueous solutions concentration using optical fiber. Journal of Instrument Engineering. 2023. Vol. 66, N 10. P. 869—875 (in Russian). DOI: 10.17586/0021-3454-2023-66-10-869-875.

Abstract. An easy-to-use method for identifying liquids and determining the concentration of substances dissolved in water is proposed, the method implementation uses short optical fiber (1–1.5 m) and does not require complex and expensive equipment. According to the proposed method, optical radiation of constant power is directed into the optical fiber, and on the same side of the fiber the power of the radiation reflected from the remote end of the fiber immersed in the liquid is recorded. It is deduced that to implement the proposed method, both single-mode and multimode optical fiber can be used using optical wavelengths of 650, 850, 1310, 1490, 1550 and 1625 nm, while the use of wavelengths 650 and 850 nm is less desirable due to greater measurement error than for other wavelengths. It is shown that the proposed method can be applied, in particular, to determine the concentration of aqueous solutions of sugar and isopropyl alcohol.

Keywords: optical fiber, sensor, reflection coefficient, concentration, solution, optical radiation

References:

1. Kulikov A.V., Ignatiev A.V. Algoritmy bezopasnosti (Security algorithms), 2010, no. 4, pp. 56–61. (in Russ.)
2. Kachura S.M., Postnov V.I. Trudy VIAM (Proceedings of VIAM), 2019, no. 5(77), pp. 52–60. (in Russ.)
3. Connolly C. Europhotonics, 2009, no. 2-3, рр. 16–18.
4. Franz J., Jain V. Optical communications. Components and Systems: analysis: design: optimization: application, CRC Press, 2000, 717 p.
5. Zenevich A.O., Zhdanovich S.V., Novikov E.V., Matkovskaia T.A., Kovalenko T.G. Journal of Instrument Engineering, 2022, no. 6(65), pp. 406–412, DOI: 10.17586/0021-3454-2022-65-6-406-412. (in Russ.)
6.  Vyalyshev A.I., Dobrov V.M., Dolgov A.A., Butov O.V., Pleshkov A.Yu. Prirodoobustroystvo (Environmental Management), 2014, no. 3, pp. 32–37 (in Russ.)
7. Dmitriyev S.A. Volokonno-opticheskaya tekhnika: sovremennoye sostoyaniye i novyye perspektivy (Fiber Optic Technology: Current State and New Prospects), Moscow, 2010, 608 р. (in Russ.)
8. Gulakov I.R., Zenevich A.O. Volokonno-opticheskiye datchiki fizicheskikh velichin (Fiber-Optic Sensors of Physical Quantities), Minsk, 2022, 367 р. (in Russ.)
9. Zenevich A.O., Mansurov T.M., Kovalenko T.G., Novikov E.V., Zhdanovich S.V., Matkovskaia T.A. Journal of Instrument Engineering, 2022, no. 12(65), pp. 895–901, DOI: 10.17586/0021-3454-2022-65-12-895-901. (in Russ.)
10. OTDR Dead Zone Explained: How to Eliminate Its Effect?, https://community.fs.com/blog/otdr-optical-time-domain-reflectometer-dead-zone-tutorial.html.
11. Lagutik A. A., Matkovskaya T.A. Vestnik Communications, 2022, no. 4, pp. 54–57. (in Russ.)
12. Vesnin V.L., Nizametdinov A.M., Ivanov O.V., Chertoriisky A.A. Sensors and systems, 2018, no. 3(223), pp. 27–32. (in Russ.)
13. Koeth JJ., Fischer M., Legge M., Seufert J., Werner R. Quantum well-, quantum dot-, and quantum cascade lasers with DFB-gratings, Photonik International, 2006, рp. 60–63.
14. Werle P. Lasers in Environmental and Life Sciences – Modern Analytical Methods, Springer, Heidelberg, 2004, рp. 223–243.
15. https://azimp.ru/catalogue/fabry_perot_lasers/.(in Russ.)