Simulation of Performance Enhancement for Water Pollution Sensor Based on Fiber Optic Technique.

Abstract

Due to the increase in water pollution (Bacteria, viruses, heavy metals, salts, etc..), it became necessary to search for new technologies and develop their performance in detecting and sensing levels of pollution for the purpose of treating them. Here in this research paper, simulation, through the COMSOL software was performed to develop the performance of the optical fiber pollution sensor through the test of changing the parameters of the optical fiber structure such as the cladding diameter with different thicknesses and doping of its material, which was of silicon with germanium with different concentrations and studying the amount of better thickness and the best concentration of the impurity to obtain the best performance of the optical fiber sensor In sensing water pollution with sodium chloride salt (for example). A single mode optical fiber with different diameters had been designed as a pollution sensor. These sensors were doped with Germanium with different concentrations in cladding region. From the obtained results it had been found that the sensors with less diameter of nanometer range were more sensitive to refractive index change of applied analyte. The higher sensitivity was obtained with fiber diameter circa 6.5 µm. Also it had been found that as Germanium concentration increase (with fixed cladding thickness) the sensor were more sensitive to the change of analyte refractive index, the best results were obtained with concentration 0.19 wt%. These sensors could be very useful in field of water pollution detection.