Optical Fibre Sensors: a Current Perspective

Culshaw, Brian

doi:10.2174/1874328501307010021

Cited by 19 publications

(5 citation statements)

References 15 publications

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“…Therefore, having a device to detect the presence of hazardous gaseous is a need in today's community. Fiber optics sensor technology has been utilized in various applications for almost a century with a variety of specifications and properties proposed by researchers to solve complex measuring problems and monitor parameters such as strain, temperature, pressure, and others [6][7][8]. The optical fiber sensor consists of a core and cladding with different refractive indices, where the light will be either transmitted to one end of the fiber or reflected back.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Optimization of Au/Ti Based-SPR Sensor by Controlling Light Incident Wavelength for Gas Sensing Application

Ahmad Khilmy,

Mukhtar,

Abdul Rashid

2022

JOMALISC

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Exposure to harmful gases may cause health problems like bone marrow deficiency, which eventually drops the number of red blood cells, causing anemia and many other dangerous diseases. This work was carried out to study the potential development of a highly sensitive Kretschmann-based surface plasmon resonance (SPR) sensor for gas sensing applications using hybrid thin films of gold/titanium (Au/Ti). To optimize the excitation of surface plasmon polaritons (SPP), the light incident wavelength was varied from visible to infrared spectra. The thickness of Au thin film with a refractive index of n= 0.1758 + 3.4101k was fixed at 50 nm. Meanwhile, the thicknesses of Ti were controlled between 1 nm to 5 nm to optimize the SPR signal. Four different types of gas samples, such as benzene, methane, carbon monoxide, and carbon dioxide, were exposed to the sensor's surface. The proposed Au/Ti-based SPR sensor with thicknesses of Ti within 1 nm to 5 nm using visible and IR wavelengths able to detect various types of gaseous. Apparently, the deployment of infrared wavelength (λ=1550 nm) at Ti thickness of 3 nm resulted in the highest sensitivity up to 2412.06°/RIU and showed excellent selectivity to differentiate different types of gases. In conclusion, Au/Ti thin films are promising hybrid materials for gas sensing applications. Obviously, the sensor's sensitivity with total hybrid thin films of 53 nm was successfully enhanced as additional material, Ti, coated on the Au thin film's surface.

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Section: Introductionmentioning

confidence: 99%

Sensitivity Optimization of Au/Ti Based-SPR Sensor by Controlling Light Incident Wavelength for Gas Sensing Application

Ahmad Khilmy,

Mukhtar,

Abdul Rashid

2022

JOMALISC

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“…Optical fiber sensing has been continuously evolving since its first observations in 1970 due to various advantages over conventional electronic sensing, such as immunity to electromagnetic interference, galvanic isolation, harsh environment suitability, no need for electrical power at the measuring point, compactness and multiplexing capability [ 1 , 2 ]. Notably, optical fiber sensors based on fiber Bragg gratings (FBGs) have gained special attention among the scientific and industrial communities.…”

Section: Introductionmentioning

confidence: 99%

An Optimized Self-Compensated Solution for Temperature and Strain Cross-Sensitivity in FBG Interrogators Based on Edge Filter

Silveira

Rocha

Antunes

et al. 2021

Sensors

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Optical fiber sensors based on fiber Bragg gratings (FBGs) are prone to measurement errors if the cross-sensitivity between temperature and strain is not properly considered. This paper describes a self-compensated technique for canceling the undesired influence of temperature in strain measurement. An edge-filter-based interrogator is proposed and the central peaks of two FBGs (sensor and reference) are matched with the positive and negative slopes of a Fabry–Perot interferometer that acts as an optical filter. A tuning process performed by the grey wolf optimizer (GWO) algorithm is required to determine the optimal spectral characteristics of each FBG. The interrogation range is not compromised by the proposed technique, being determined by the spectral characteristics of the optical filter in accordance with the traditional edge-filtering interrogation. Simulations show that, by employing FBGs with optimal characteristics, temperature variations of 30 °C led to an average relative error of 3.4% for strain measurements up to 700μϵ. The proposed technique was experimentally tested under non-ideal conditions: two FBGs with spectral characteristics different from the optimized results were used. The temperature sensibility decreased by 50.8% as compared to a temperature uncompensated interrogation system based on an edge filter. The non-ideal experimental conditions were simulated and the maximum error between theoretical and experimental data was 5.79%, proving that the results from simulation and experimentation are compatible.

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“…To resume, the optical fiber sensing technology is today a successful and mature technology after a half-century of development [1][2][3][4][5], with a yearto-year increasing market participation. It is expected that in the near future arose new emerging applications offering new opportunities for research and exploitation.…”

Section: Introductionmentioning

confidence: 99%

Introductory Chapter: Application of Optical Fiber for Sensing

Cuadrado-Laborde¹

2019

Applications of Optical Fibers for Sensing

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Optical Fibre Sensors: a Current Perspective

Cited by 19 publications

References 15 publications

Sensitivity Optimization of Au/Ti Based-SPR Sensor by Controlling Light Incident Wavelength for Gas Sensing Application

Sensitivity Optimization of Au/Ti Based-SPR Sensor by Controlling Light Incident Wavelength for Gas Sensing Application

An Optimized Self-Compensated Solution for Temperature and Strain Cross-Sensitivity in FBG Interrogators Based on Edge Filter

Introductory Chapter: Application of Optical Fiber for Sensing

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