Analysis Of The Bending Effect Of Single Mode Fiber (SMF) Structure Towards The Performance Of Multimode-Single Mode-Multimode (MSM) Fibre Optic Sensor For Liquid Concentration Measurement

Mohd Badari, Muhammad Khairul Ikhwan (2018) Analysis Of The Bending Effect Of Single Mode Fiber (SMF) Structure Towards The Performance Of Multimode-Single Mode-Multimode (MSM) Fibre Optic Sensor For Liquid Concentration Measurement. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The fiber optic sensors also called an optical fiber sensor using an optical fiber or sensing element. These sensors are used to sense some quantities like temperature, pressure, vibrations, displacements, rotations or concentration of chemical species. Fibers have so many uses in the field of remote sensing because they require no electrical power at the remote location. The Fiber Optic Sensor (FOS) has an optical fiber connected to a light source to allow for detection in tight spaces or where a small profile is beneficial. In this project, FOS has been employed for liquid concentration measurement by using a Mach-Zehnder Interferometer (MZI) structure by using Multimode-Single Mode-Multimode (MSM) configuration as a FOS to analyze the sensitivity of the MSM configuration. The MSM is designed and fabricated. The MSM is developed by using a fusion arc splicing technique and etching technique. The fibers are used for the lead-in and lead-out sections are multimode fiber (MMF) while the single mode fiber (SMF) represents the sensing-region and it will analyze with different size of the diameter of bending and a different number of loops. The diameter that involves is 2.4 cm, 2.8 cm, and 3.3 cm while the number of loops is 1 loop, 2 loops, and 3 loops respectively. The etched sensors were tested in water, 1.0 mol sucrose solution and palm oil with the refractive index (RI) respectively. The best sensitivity of the sensor achieved at an operating wavelength of 1310 nm, the diameter of 3.3 cm and loop 3 which is -17.22 nm/RIU. It can be seen that the sensitivity of the sensor increase with the increase of refractive index, diameter and number of the loop.

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