Rancang Bangun Sensor Regangan (Strain) Berbasis Serat Optik Plastik (POF) Komposit PMMA/PDMS

Winarno, Arzetti Hasna (2026) Rancang Bangun Sensor Regangan (Strain) Berbasis Serat Optik Plastik (POF) Komposit PMMA/PDMS. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 5009221113-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (6MB) | Request a copy

Abstract

Sensor regangan berbasis Plastic Optical Fiber (POF) menjadi salah satu alternatif yang menjanjikan untuk aplikasi pemantauan struktur karena memiliki fleksibilitas tinggi, tahan terhadap interferensi elektromagnetik, serta biaya fabrikasi yang relatif rendah. Performa sensor berbasis POF sangat dipengaruhi oleh karakteristik medium optik yang digunakan. Oleh karena itu, penelitian ini bertujuan mengembangkan komposit Poly(methyl methacrylate) (PMMA) dan Polydimethylsiloxane (PDMS) sebagai medium POF untuk aplikasi sensor regangan. Komposit PMMA/PDMS difabrikasi menggunakan metode solution casting dengan variasi komposisi PMMA/PDMS sebesar 100/0, 95/5, 90/10, 85/15, 80/20, 75/25, 70/30, dan 0/100 (% berat). Karakterisasi material dilakukan menggunakan spektroskopi UV-Vis untuk mengevaluasi karakteristik optik, Fourier Transform Infrared Spectroscopy (FTIR) untuk mengidentifikasi gugus fungsi, Scanning Electron Microscopy (SEM) untuk mengamati morfologi komposit, serta Dynamic Mechanical Analysis (DMA) untuk menganalisis sifat mekanik material. Selanjutnya, performa sensor dievaluasi melalui pengujian transmisi optik dan pengujian regangan berbasis modulasi intensitas. Hasil karakterisasi menunjukkan bahwa peningkatan kandungan PDMS menyebabkan penurunan transmitansi dan optical band gap, serta peningkatan absorbansi, koefisien absorpsi, dan energi Urbach yang mengindikasikan meningkatnya ketidakteraturan struktur optik komposit. Analisis FTIR menunjukkan bahwa komposit terbentuk melalui interaksi fisik tanpa pembentukan gugus fungsi baru, sedangkan hasil SEM memperlihatkan meningkatnya heterogenitas morfologi akibat distribusi fase PMMA dan PDMS. Hasil DMA menunjukkan bahwa penambahan PDMS menurunkan modulus elastis sehingga material menjadi lebih fleksibel terhadap deformasi. Pengujian sensor menunjukkan bahwa seluruh variasi komposit mampu merespons regangan melalui peningkatan optical loss. Komposisi PMMA/PDMS 70/30 menghasilkan sensitivitas tertinggi sebesar 0,1250 dB/%, sedangkan komposisi PMMA/PDMS 85/15 memberikan keseimbangan terbaik antara karakteristik optik, transmission loss, sensitivitas sebesar 0,1098 dB/%, dan linearitas sebesar 0,992. Hasil penelitian menunjukkan bahwa rekayasa komposisi PMMA/PDMS mampu mengendalikan karakteristik optik dan mekanik medium POF sehingga menghasilkan performa sensor regangan yang lebih baik, dengan komposisi PMMA/PDMS 85/15 sebagai komposisi yang paling sesuai untuk pengembangan medium POF pada aplikasi sensor regangan.
=====================================================================================================================================
Plastic Optical Fiber (POF)-based strain sensors have emerged as a promising alternative for structural health monitoring applications due to their high flexibility, immunity to electromagnetic interference, and relatively low fabrication cost. The performance of POF-based sensors is strongly influenced by the characteristics of the optical medium. Therefore, this study aims to develop a Poly(methyl methacrylate) (PMMA)/Polydimethylsiloxane (PDMS) composite as a POF medium for strain sensing applications. PMMA/PDMS composites were fabricated using the solution casting method with PMMA/PDMS weight ratios of 100/0, 95/5, 90/10, 85/15, 80/20, 75/25, 70/30, and 0/100. Material characterization was performed using UV-Vis spectroscopy to evaluate the optical properties, Fourier Transform Infrared Spectroscopy (FTIR) to identify functional groups, Scanning Electron Microscopy (SEM) to examine the composite morphology, and Dynamic Mechanical Analysis (DMA) to investigate the mechanical properties. The sensor performance was subsequently evaluated through optical transmission and intensity-modulated strain measurements. The results showed that increasing the PDMS content reduced the optical transmittance and optical band gap while increasing the absorbance, absorption coefficient, and Urbach energy, indicating a higher degree of structural disorder within the composite. FTIR analysis revealed that the composite was formed through physical interactions without the formation of new functional groups, whereas SEM observations demonstrated increased morphological heterogeneity due to phase distribution between PMMA and PDMS. DMA results showed that the incorporation of PDMS reduced the elastic modulus, resulting in a more flexible material. Sensor evaluation demonstrated that all composite compositions responded to strain through an increase in optical loss. The PMMA/PDMS 70/30 composition exhibited the highest sensitivity of 0.1250 dB/%, while the PMMA/PDMS 85/15 composition provided the best balance between optical characteristics, transmission loss, sensitivity (0.1098 dB/%), and linearity (R² = 0.992). These findings demonstrate that tailoring the PMMA/PDMS composition effectively controls the optical and mechanical properties of the POF medium, leading to improved strain sensing performance, with the PMMA/PDMS 85/15 composition identified as the most suitable material for POF-based strain sensor applications.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Plastic Optical Fiber (POF), PMMA/PDMS, Sensor regangan, Komposit polimer, SDGs 9 (Industry, Innovation and Infrastructure).
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA1800 Fiber Optics T Technology > TA Engineering (General). Civil engineering (General) > TA418.16 Materials--Testing. T Technology > TA Engineering (General). Civil engineering (General) > TA418.9 Composite materials. Laminated materials.
Divisions:	Faculty of Industrial Technology > Physics Engineering > 30201-(S1) Undergraduate Thesis
Depositing User:	Arzetti Hasna Winarno
Date Deposited:	04 Aug 2026 02:14
Last Modified:	04 Aug 2026 02:16
URI:	http://repository.its.ac.id/id/eprint/142599

Actions (login required)

View Item