Single-Mode-Multimode Silica Rod-Single-Mode High Refractive Index Fiber Sensor

Saimon, Siti Mahfuza; Noor, Muhammad Yusof Mohd; Azmi, Asrul Izam; Abdullah, Ahmad Sharmi; Ibrahim, Mohd Haniff; Salim, Mohd Rashidi; Ahmad, Mohd Hafizi; Othman, Ahmad Fauzi

doi:10.1109/jsen.2022.3168744

Cited by 6 publications

(2 citation statements)

References 31 publications

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“…We selected diameters of 100 μm and above to ensure the sensor structure remains robust and less prone to breakage. Additionally, it is important to study how different NCF diameters affect sensor performance, as previous research indicates that the diameter influences overall sensor sensitivity [10]. Then, the corresponding first self-imaging lengths to comprehend the positionings of self-images across different NCF sizes.…”

Section: Theoretical Simulationmentioning

confidence: 99%

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Investigation of transformer oil aging using no-core optical fiber (NCF) sensor

Zaidi,

Saris,

Mohd Noor

et al. 2024

Phys. Scr.

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Transformer oil plays a crucial role in insulation and cooling within high-voltage transformers, but it degrades over time. This research proposes a durable sensor capable of detecting the refractive index (RI) of transformer oil when it exceeds the RI of the sensor structure, known as high refractive index (HRI) sensing. The study utilizes a no-core optical fiber (NCF) to monitor the quality of transformer oil. In this setup, single mode fiber (SMF) is employed as both the input and output of the NCF, forming an SMF-NCF-SMF (SNS) sensor. To date, to the use of an NCF in the SMF-NCF-SMF scheme has not been reported for high RI fiber sensing and transformer oil degradation detection. Additionally, this study provides an analysis of the influence of different diameters and lengths of NCF on the sensor’s sensitivity. The HRI sensing performance of the sensor was evaluated both numerically and experimentally by observing power spectrum changes due to leaky modes interference in response to varying transformer oil RI values from 1.4600 RIU to 1.5500 RIU. The NCF, with a geometry of 1 cm in length and 100 µm in diameter, demonstrated remarkable sensitivity, achieving up to 88.285 dBm/RIU for HRI values within the specified range. The sensor effectively discerned various aging levels of transformer oil in power transformer applications. Additionally, since the NCF structure is entirely composed of silica-based materials, it exhibited significant temperature resistance. These characteristics make the SNS structure well-suited for reliable deployment in challenging thermal environments.

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Section: Theoretical Simulationmentioning

confidence: 99%

“…A thermal method was used for the transformer oil aging process [1]. From the literature, most experiments are conducted using 6-7 samples [5,10,11]. Therefore, six samples (B1 to B6) were used in this study.…”

Section: Power Transformer Application In Oil Aging Detectionmentioning

confidence: 99%