Development of single side polished plastic optical fiber intensity-based sensor for humidity detection

Bakar, Mohamad Basir (2023) Development of single side polished plastic optical fiber intensity-based sensor for humidity detection. Project Report. Melaka, Malaysia, Universiti Teknikal Malaysia Melaka. (Submitted)

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Abstract

The purpose of this investigation is to explain a straightforward and compact optical fiber that makes use of a tapered plastic optical fiber (POF) that has a design in the shape of a U. The optical fiber transmits data using a system that allows for the intensity of the light to be varied. POF is a type of optical fiber in which the core material is polymethyl methacrylate (PMMA), which allows light to pass through it. POF can also be used in sensing. POF is superior to silica fiber in a number of ways, including the fact that it can be stretched further before breaking, the fact that its component parts are simpler and cheaper, and the fact that it is also lighter. POF are a promising substrate for low-cost sensing because of their enormous core size, which allows evanescent waves to be coupled. This project’s purpose is to develop a low-cost sensing device for humidity sensors. The POF was modified using chemical etching technique with a three cm tapering length was used to lower the waist diameter of POF at 400, 500, 600, and 700 um.A single side polished POF was tapered with sand paper until the waist diameter achieved. An experiment was conducted with the purpose of finding the optimal taper waist diameter and evaluating the sensing performance of the suggested structure. The experiment used two separate wavelengths, 470 nm (Blue) and 645 nm (Red). The POF was bending into a U-shape and increasing the decrease of tapered POF waist diameter will increase the number of total internal reflection (TIR) events, resulting in more evanescent wave (EW) contact with the environment, but will also increase light leakage. The data analysis that will be taken in this project is optimization number of layers, repeatability, stability and resolution. The best waist diameter with the best wavelengths will be taken for the proposed sensor.

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