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Home > Archives > Volume 20, No 5 (2022) > Article

DOI: 10.14704/nq.2022.20.5.NQ22566

Surface Plasmon Resonance Optical Fiber Sensor for Water Quality Diagnosis

FarahZ. Hassan1, Hashim Ali2

Abstract

The reflective optical fiber sensor based on surface plasmon resonance (SPR) phenomena was presented in this study to detect various NaCl concentrations in water. This sensor employs wavelength interrogation. is built with a multi-mode fiber/no-core fiber (MMF-NCF) structure, with the MMF acting as both the input and output path and the NCF acting as the sensing region. NCF has a length of 1cm and an outer diameter of 125 m. For exciting SPR, the NCF's side surfaces are coated with a gold film with a thickness of 40 nm. To reflect the optical signal, the end surface of the NCF is also coated with a 60nm thick gold film. The results obtained in the experiment showed that the sensor's sensitivity is 0.24 nm/% in the range of 0 % to 25 % concentrations. Furthermore, the proposed sensor outperforms and outlasts the previously reported systems in terms of performance and mechanical strength.

Keywords

Optical Fiber, No-coreFiber, Sensor, salinity.

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