D-Shaped Polarization Maintaining Fiber Sensor for Strain and Temperature Monitoring

Qazi, Hummad Habib; Mohammad, Abu Bakar; Ahmad, Harith; Zulkifli, Mohd Zamani

doi:10.3390/s16091505

Cited by 34 publications

(13 citation statements)

References 41 publications

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“…The most common example of this class of fibers is the D-shaped fiber, often used in interferometric sensors [ 17 ] because of its fiber structure, partially exposing guided light to the environment. These fibers are usually polished or etched into a D-shape towards the core in order to expose the guided modes partially.…”

Section: Theorymentioning

confidence: 99%

Birefringent Bragg Grating in C-Shaped Optical Fiber as a Temperature-Insensitive Refractometer

Tan

Tse

et al. 2018

Sensors

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We demonstrate a simple-to-fabricate refractometer based on the inscription of fiber Bragg gratings in a special C-shaped optical fiber. The C-shaped fiber was drawn into shape using a quarter cladding removed preform of a commercial standard single-mode fiber by simple machining. The sensor did not suffer from cross-sensitivity of the refractive index with ambient temperature fluctuations, commonly occurring with many optical fiber refractometers. A refractive index sensitivity of 1300 pm per refractive index unit (RIU) was achieved without employing any additional sensitization techniques such as tapering or etching.

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Section: Theorymentioning

confidence: 99%

Birefringent Bragg Grating in C-Shaped Optical Fiber as a Temperature-Insensitive Refractometer

Tan

Tse

et al. 2018

Sensors

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“…Fiber optics sensors (FOS) are attractive to the scientific community and industry due to their intrinsic properties, such as small size, lightweight, corrosion resistance, immunity to electromagnetic interference, and high sensitivity. Several FOS have been assembled using specialty fibers such as photonic crystal fiber (PCF) [1,2], capillary hollow-core fiber (CHCF) [3], microfiber [4], D-shaped fiber [5], fiber Bragg grating (FBG) [6,7], long-period fiber grating (LPBG) [8], tilted fiber Bragg grating (TFBG) [9], and multicore optical fiber [10]. Recently, the fabrication of FOS using CHCF has been increased due to its easy fabrication and low-cost.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Enhancement of Curvature Fiber Sensor Based on Polymer-Coated Capillary Hollow-Core Fiber

Herrera-Piad

Hernández-Romano

May-Arrioja

et al. 2020

Sensors

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In this paper, we propose and experimentally demonstrate a simple technique to enhance the curvature sensitivity of a bending fiber optic sensor based on anti-resonant reflecting optical waveguide (ARROW) guidance. The sensing structure is assembled by splicing a segment of capillary hollow-core fiber (CHCF) between two single-mode fibers (SMF), and the device is set on a steel sheet for measuring different curvatures. Without any surface treatment, the ARROW sensor exhibits a curvature sensitivity of 1.6 dB/m−1 in a curvature range from 0 to 2.14 m−1. By carefully coating half of the CHCF length with polydimethylsiloxane (PDMS), the curvature sensitivity of the ARROW sensor is enhanced to −5.62 dB/m−1, as well as an increment in the curvature range (from 0 to 2.68 m−1). Moreover, the covered device exhibits a low-temperature sensitivity (0.038 dB/°C), meaning that temperature fluctuations do not compromise the bending fiber optic sensor operation. The ARROW sensor fabricated with this technique has high sensitivity and a wide range for curvature measurements, with the advantage that the technique is cost-effective and easy to implement. All these features make this technique appealing for real sensing applications, such as structural health monitoring.

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“…A side polishing on optical fibre can be produced by using a CO 2 laser or femtosecond laser machining. However, these devices less suitable for fibre optic-based sensing applications due to fabrication complex process [19]. The polishing process needs very careful attention during the application.…”

Section: Introductionmentioning

confidence: 99%

Measurement of dissolved decay products of transformer oil using D-shaped plastic optical fibre as a sensor

Razzaq

Zainuddin

Chyad³

et al. 2020

IET Science, Measurement &Amp; Technology

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Transformer oil is widely used in high-voltage transformers as a cooling and insulation medium. Electrical and thermal stresses expose transformer oil to degradation, which may produce dissolved decay products (DDPs) that are partially adsorbed on the insulation paper and accelerate the degradation of oil and paper. An evanescent field D-shaped plastic optical fibre (POF) sensor was fabricated using the side-polishing technique to detect DDPs in transformer oil. A laser light source and power meter were used in the prototype to measure the output power of the POF sensor. The measurement of DDPs was conducted on seven samples of insulating oil collected from the field. The sensor performance was evaluated based on different sensing areas, and the sensor sensitivity was measured. Results show an excellent correlation between the output power and DDPs. A correlation analysis was conducted amongst sensor output power, transformer oil refractive index and area under the absorbance curve. The performance of the sensor demonstrates improved linearity and sensitivity of 97.49% and 26.6779 µW/ RIU, respectively. The POF sensor is easily fabricated, low cost and can be used for real-time monitoring of high-voltage transformers.

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D-Shaped Polarization Maintaining Fiber Sensor for Strain and Temperature Monitoring

Cited by 34 publications

References 41 publications

Birefringent Bragg Grating in C-Shaped Optical Fiber as a Temperature-Insensitive Refractometer

Birefringent Bragg Grating in C-Shaped Optical Fiber as a Temperature-Insensitive Refractometer

Sensitivity Enhancement of Curvature Fiber Sensor Based on Polymer-Coated Capillary Hollow-Core Fiber

Measurement of dissolved decay products of transformer oil using D-shaped plastic optical fibre as a sensor

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