Pemanfaatan Serat Optik Struktur Singlemode-Multimode Coreless-Singlemode (SMS) sebagai Sensor Ion Magnesium

Hidayati, Rinda Nur (2018) Pemanfaatan Serat Optik Struktur Singlemode-Multimode Coreless-Singlemode (SMS) sebagai Sensor Ion Magnesium. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kondisi normal tubuh manusia membutuhkan jumlah minimum magnesium sebesar 0,25 mmol. Magnesium diperlukan tubuh antara lain untuk proses metabolisme energi, sintesis protein dan pemecahan asam lemak. Oleh karena itu, penting adanya deteksi magnesium dibidang industri makanan dan minuman yang dikonsumsi oleh manusia. Serat optik berstruktur singlemode-multimode¬-singlemode telah banyak dikembangkan sebagai sensor karena memiliki sensitivitas yang tinggi dan fabrikasi mudah. Sensor serat optik SMS memanfaatkan fenomena multimode interference (MMI) yaitu fenomena yang terjadi akibat pemantulan cahaya berulang dalam susunan core dan cladding serat optik. Pada penelitian ini, konfigurasi sensor serat singlemode-multimode coreless-singlemode (SMS) yang digunakan adalah konfigurasi lurus, U-bent dan tapered fiber. Pengujian dilakukan pada konsentrasi ion magnesium 0% - 5%. Sensor serat SMS konfigurasi lurus memiliki sensitivitas tinggi sebesar 0,6632 dBm/% pada panjang serat multimode coreless 30 mm. Telah dirancang sensor serat SMS konfigurasi lurus dengan penampahan lapisan graphene dan multi-walled carbon nanotubes (MWCNTs) sebagai cladding, didapatkan sensitivitas yang lebih tinggi dibanding tanpa penambahan lapisan yaitu 1,4941 dBm/% dan 3,6623 dBm/%. Sensor serat SMS U-bent memiliki sensitivitas tinggi sebesar 0,7667 dBm/% pada diameter serat 10 mm. Sensor serat SMS-tapered fiber memiliki sensitivitas 3,7761 dBm/% pada variasi waktu pencelupan 15 menit. Berdasarkan hasil pengujian bahwa semakin tinggi konsentrasi ion magnesium maka daya keluaran serat SMS akan semakin menurun. Hal tersebut dikarenakan sensor ion magnesium berbasis serat SMS memanfaatkan prinsip sensing indeks bias. Indeks bias ion magnesium berbeda setiap konsentrasi, semakin besar konsentrasi maka indeks bias akan semakin besar sehingga daya keluaran serat akan menurun. Serat SMS sebagai sensor ion magnesium yang memiliki karakteristik sensor baik yaitu serat SMS-tapered fiber akan tetapi memiliki kekurangan dalam hal fabrikasi yang lebih rumit jika dibandingkan dengan konfigurasi lurus maupun U-bent. ========================================================= The normal condition of the human body requires a minimum amount of magnesium of 0.25 mmol. Magnesium is needed for the process of energy, protein synthesis, and fatty acids. Therefore, it is important to detect magnesium in the food and beverage industry. Singlemode-multimode-singlemode (SMS) fiber structure offer some advantage such as low cost test equipment, ease of fabrication, and high sensitivity. In this work, three types of SMS configuration are tested where straight configuration, U-bent, and tapered fiber. The SMS fiber has a length of 30 mm multimode coreless fiber and was fabricated by connecting two optical fiber singlemode and multimode coreless fiber. In addition, to enhance the performance of the sensing probe, SMS fiber were coated with sensitive material such as graphene and multi-walled carbon nanotubes (MWCNTs) for sensing different concentrations of magnesium. The straight configuration SMS fiber was first tested to measure the concentration of magnesium where the sensitivity of the sensor are obtained at 0.6632 dBm/%, 1.4941 dBm/%, and 3.6623 dBm/% for bare fiber, graphene coated, and MWCNTs coated, respectively. Evidently coating the SMS fiber with graphene and MWCNTs has enhanced the sensitivity of the sensor.The SMS U-Bent sensor also display a linear relationship between magnesium concentration and the output intensity with sensitivity of 0.7667 dBm/% in 10 mm fiber diameter. Finally, the performance of SMS-tapered fiber sensor is also studied. It is observed that the sensitivity of the sensor is 3.7761 dBm/%. As the magnesium concentration increases from 0% to 5%, the output power of the SMS fiber structure decreases linearly. The refractive index value of the magnesium ions change the output power of the SMS fiber structure.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Serat optik SMS, serat multimode coreless, graphene, MWCNTs, U-bent, tapered fiber, ion magnesium, sensitivitas
Subjects: Q Science > QC Physics > QC448 Fiber optics.
Divisions: Faculty of Industrial Technology > Physics Engineering > 30101-(S2) Master Thesis
Depositing User: Nur Hidayati Rinda
Date Deposited: 23 Jun 2021 08:25
Last Modified: 23 Jun 2021 08:25
URI: https://repository.its.ac.id/id/eprint/54692

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