Detection and determination of manganese concentration in water using a fiber Bragg grating coupled with nanotechnology

Abstract

Through this paper we experimentally demonstrate the fabrication of a fiber Bragg grating (FBG) chemical sensor to detect and determine the manganese concentration in water and compare our results with sophisticated spectroscopic methods, such as atomic absorption spectrometry and the inductively coupled plasma method. Here we propose a simple method to develop a thin layer of gold nanoparticles above the etched grating region to enhance the sensitivity of the reflected spectrum of the FBG. By doing so, we achieve a sensitivity of 1.26 nm/parts per million in determining the trace level of Mn in water. Proper reagents are used to detect manganese in water.

Core-cladding mode resonances of long period fiber grating in concentration sensor

“…The result is verified with sophisticated instruments like Atomic Absorption Spectrometer (AAS) and Inductive Coupled Plasma (ICP) method. We have also determined the concentration of manganese in the same sample using FBG and both results are comparable [17]. The results obtained using different methods are tabulated in Table 2.…”

Fabrication of Fiber Bragg Grating Coating with TiO2 Nanostructured Metal Oxide for Refractive Index Sensor

“…Specific and highly sensitive chemical sensors for in-water monitoring were made by coating fiber long period gratings with a nanoscale Syndiotactic Polystyrene (sPS) in nanoporous crystalline form by dip coating technique [5]. Other methods of coating were used to fabricate an optical chemical sensor in which the etched region of FBG was coated by a thin layer of gold nanoparticles to detect and determine the manganese concentration in water [6]. FBG was coated with different film thicknesses of gold by sputtering deposition technique and using it as a chemical sensor for ethanol in aqueous solution.…”