Development of an optical microfiber sensor for in different saltwater concentration for using a tapering method

Mohd Ibrahim, Mohamad Afiq Isaac (2024) Development of an optical microfiber sensor for in different saltwater concentration for using a tapering method. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

One of the most effective and powerful uses of fiber optics and sensing technology is fiber-optical sensing. The rising need for optical sensors is due to the improved performances, versatilities, flexibility, and taking up less space. Furthermore, fiber optic sensors have gained a lot of interest because of their high sensitivity, quick detection speed, and capacity to operate in challenging circumstances. This work describes the creation of a very sensitive optical microfiber sensor for detecting and measuring various saltwater concentrations using a tapering method. The suggested sensor takes advantage of the unique characteristics of optical microfibers, such as their high surface area-to-volume ratio and evanescent field interaction, to provide improved sensitivity and accuracy in monitoring saltwater concentrations. A standard single-mode fiber is heated and pulled to reduce its diameter, creating a waist region with a noticeably lower cross-sectional area. This process is used to fabricate the optical microfiber sensor. By increasing the evanescent field interaction between the sensor and the medium, this tapering process increases the ability to detect variations in the refractive index brought on by variable saltwater concentrations. After choosing the best sample of developed tapered microfiber, three samples of different concentrations of salt water were tested. Before each test, the fiber would be dipped in the samples and measured. The findings will be described in terms of sensitivity, correlation, and coefficient of determination of the graph.

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