Analysis Of The Bending Effect Of Multimode Fiber (MMF) Structure Toward The Performance Of The Single Mode-Multimode-Single Mode (SMS) Fiber Optic Sensor For Liquid Concentration Measurement

Zaidi, Aina Izzati (2018) Analysis Of The Bending Effect Of Multimode Fiber (MMF) Structure Toward The Performance Of The Single Mode-Multimode-Single Mode (SMS) Fiber Optic Sensor For Liquid Concentration Measurement. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Fiber optic sensor is a method of transmitting information from one place to another by sending pulses of light through an optical fiber. There are various types of sensors used based on electrical for liquid concentration measurement. Although most of the devices work well in practice, the sensors are costly and have a complicated configuration. However, fiber optic cable is immune to electromagnetic interference (EMI) or any short circuit and it safe to be used for flammable and non-flammable. In this project, fiber optic sensor (FOS) was designed and developed. The fibers are used for the lead-in and lead-out sections are single mode fiber (SMF) while the multimode fiber (MMF) represents the sensing-region and analyze with different size of diameter and a different number of loops. So, the diameter involves are 2.4 cm, 2.7 cm, and 3.3 cm and while the number of loops are 1 loop, 2 loop, and 3 loop. The length of the sensor used was 30 cm which is the bending part. The FOS is developed by using a fusion arc splicing technique. The etched sensors were tested in water, 1.0 mol sucrose solution and palm oil with the refractive index (RI) respectively. The bending effect of the sensor device experienced a redshift wavelength. The best sensitivity of the sensor achieved at 3 loop which is 9.7498 nm/RIU and with the size of diameter 3.3 cm which is 8.3557 nm/RIU. It can be seen that the sensitivity of the sensor increase with the number of the loop and increased diameter.

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