Characterization of zinc oxide coated polymer optical fiber for limonene concentration measurement

Azhar, Nor Asyiqin (2023) Characterization of zinc oxide coated polymer optical fiber for limonene concentration measurement. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Limonene concentration detection based on ZnO coated polymer optical fiber (POF) by using the intensity modulation technique was proposed. Zinc oxide was prepared by using a hydrothermal method and to prove the success of ZnO coating, the POF surface morphology was observed by using Scanning Electron Microscope (SEM). The POF was tapered to a certain diameter by using the chemical etching method. The tapered waist diameters of the POF are 0.45 mm, 0.50 mm, 0.55 mm, 0.60 mm, 0.65 mm, and 0.70 mm at 10 cm fiber length, and the unclad length of 2 cm was coated with ZnO using the dip-coating method. The refractive index for different concentrations of limonene solution was studied in this project. It is observed that as the limonene concentration increase from 20% to 100%, the output voltage will decrease. The higher sensor's sensitivity was recorded at 0.205 V/%, and the slope has more than 99%, linearity for the 0.55 mm tapered POFs, respectively. Furthermore, the refractive index varied as the concentration of limonene changed.

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