Development of double side-polished tapered plastic optical fiber sensor for humidity application

Ibrahim, Nurul Hasanah (2023) Development of double side-polished tapered plastic optical fiber sensor for humidity application. Project Report. Melaka, Malaysia, Universiti Teknikal Malaysia Melaka. (Submitted)

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Abstract

Humidity levels that are too low might have a negative influence on human health and the environment. Humidity levels that are too high might lead to mould, wetness and also can affect electronics. Humidity sensing is important in a variety of sectors, including industrial processes, agriculture, engineering, medicine, and more. Humidity is a measurement of how much water vapour is present in the air. The amount of water in the air is measured in relation to the greatest amount of water vapour in the atmosphere (moisture). Plastic optical fibers (POF) are a material that can be used as a humidity sensor element. This report examines a simple and small optical fiber that uses a tapered plastic optical fiber (POF) in a U-shape design and is based on modulated light intensity. This project’s purpose is to develop a low-cost sensing device for humidity sensing applications. To get the waist diameters of POF for 400 μm, 500 μm, 600 μm, and 700 μm, the POF was tapered manually using a polishing method employing sand paper with a 3 cm tapering length to reduce the waist diameter of the POF. To discover the ideal tapered waist diameter and evaluate how effectively the proposed structure could perceive, three distinct wavelengths of 470 nm, 530 nm, and 645 nm were used in this project. A substantial reaction was recorded for humidity concentration values ranging from 35% RH to 80% RH. This project's data analysis includes repeatability, trendline, hysteresis, stability, sensitivity, linearity, and resolution. For the proposed sensor, 500 μm is the best waist diameter, and the best wavelength of 645 nm has been chosen.

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