Characterization of limonene concentration based on tapered polymer optical fiber

Said, Norshafiqah (2022) Characterization of limonene concentration based on tapered polymer optical fiber. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The research will demonstrate the capability of an optical sensing technology to measure limonene concentration, which is one of the possible biomarkers for early liver disease detection, and make it more dependable in industry-based applications. Using the Polymer Optical Fiber (POF) sensor, the change in output voltage against varied dimensions of tapered POF, different LED light sources (RGB), and variations in limonene concentration levels were detected. The difference in limonene concentrations indicates different level of liver health in a human body. The developed sensor device consists of an RGB light emitting diode (LED) and a photodiode that acts as a light source and detector for POF. The receiving circuit and Arduino platform were used for signal amplification and processing. The POF was tapered to four different diameters to test the sensitivity of the sensor (0.70mm, 0.65mm, 0.60mm, and 0.55mm). UV Visible Spectroscopy was applied to study the absorption of light, which based on the absorption of ultraviolet or visible light by a substance. Overall, the result from this research shows that the 0.055mm diameter of tapered POF with Green LED as the source of light, recorded the highest sensitivity and linearity. As for the UV-Vis, the sample with 100% limonene concentration obtained the highest absorption of light, with the least rate of light transmission.

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