Fiber Bragg grating based pH sensor

Yulianti, Ian; Supa'at,; Idrus,; Kassim,; Al-hetar, Abdulaziz M.

doi:10.1109/escinano.2010.5701000

Cited by 3 publications

(4 citation statements)

References 4 publications

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“…Fiber Bragg grating (FBG) sensors coated with pH-sensitive hydrogel have been studied through a simulation, which showed that they can provide a linear response in the pH range of 5 to 7 with a sensitivity of 0.164 nm/pH unit [9], [10]. Optical pH sensors have advantages compared to the conventional ones, being free from electromagnetic interference, having wide bandwidth, being open to miniaturization, real-time measurement and remote sensing [11]- [13].…”

Section: Introductionmentioning

confidence: 99%

FBG Multifunctional pH Sensor - Monitoring the pH Rain in Cultural Heritage

2018

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A new era of pollution requires an important focus on the conservation of archaeological sites and monuments. In the last years great efforts were required to develop various sensors for different tasks. The fiber Bragg grating (FBG) was one of the most studied thanks to the multitude of applications and the surprising performances. An original fiber optic sensor that combines the fiber Bragg gratings<strong> </strong>with a pH responsive polymer coating for monitoring the pH of the rains on critical and prestigious monuments is proposed. The core consists of four different materials, which makes the sensor very innovative and allowing it to reach a high sensitivity. In this study, the setup arrangement of the optical sensor is modeled with COMSOL Multiphysics (Wave Optics Module), based on the FEM (Finite Element Method) solver. Monitoring the pH of water can be used by experts to predict and control the corrosion phenomenon of specific materials, especially limestone and marble, thus scheduling the timely restoration.

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Section: Introductionmentioning

confidence: 99%

FBG Multifunctional pH Sensor - Monitoring the pH Rain in Cultural Heritage

2018

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“…A simple and small size FBG-based pH sensor design has been demonstrated previously by the authors [10]. By coating pH sensitive hydrogel on the FBG, it was found that the mechanical expansion of the hydrogel coating could induce strain on the FBG.…”

Section: Introductionmentioning

confidence: 90%

“…The FBG can be employed as a pH sensor transducer by coating pH sensitive hydrogel on the FBG [10]. Hydrogel can be tailored to be sensitive to certain factors such as temperature, electric and magnetic fields, and pH of the medium.…”

Section: Sensing Mechanism Of the Fbg-based Ph Sensormentioning

confidence: 99%

Sensitivity improvement of a fibre Bragg grating pH sensor with elastomeric coating

Yulianti

Supa’at

Idrus

et al. 2011

Meas. Sci. Technol.

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A new optical pH sensor based on fibre Bragg grating (FBG) is demonstrated. The sensor consists of a FBG coated with pH sensitive hydrogel. The sensing was performed through the detection of wavelength shifts resulting from the induced strain on the FBG due to mechanical expansion of the hydrogel. An elastomeric coating was applied before the hydrogel coating to improve the sensitivity. The sensor performance was investigated by simulating the hydrogel swelling and the strain induced on the FBG. The swelling of hydrogel due to pH change was modelled using a free-energy function and was solved using the finite element method. With silicone rubber as the elastomer material, the results show that the sensitivity was improved by up to 66% compared to that of the FBG pH sensor without elastomeric coating.

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“…This paper investigates the stress in OF induced by pH sensitive hydrogel coating. The pH sensitive hydrogel coated OF can be used as optical pH sensor [9]. The inhomogenous swelling of hydrogel due to OF as mechanical constraint was modeled using free energy function as proposed by Marcombe et al [10].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Stress Analysis of Optical Fiber due to Mechanical Expansion of Hydrogel Coating

Yulianti

Supa’at

Idrus

et al. 2011

AMM

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This paper presents the stress analysis in optical fiber due to swelling of hydrogel material coated on it. The silica optical fiber was assumed to be coated by hydrogel that consists of hydroxyethyl methacrylate, acrylic acid and ethylene glycol dimethacrylate as crosslinker. The hydrogel swelling was modeled using free energy function. The conditional equilibrium of hydrogel was solved using finite element method and the stress induced in optical fiber was simulated simultaneously. The simulations were done for two hydrogel coating thickness values, 30 µm and 40 µm. Etched optical fiber coated by 40 µm hydrogel was also simulated. The results show that maximum stress in optical fiber is higher for thicker hydrogel thickness and is higher for etched optical fiber. Maximum stress magnitudes at all pH values are below tensile strength of optical fiber.

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Fiber Bragg grating based pH sensor

Cited by 3 publications

References 4 publications

FBG Multifunctional pH Sensor - Monitoring the pH Rain in Cultural Heritage

FBG Multifunctional pH Sensor - Monitoring the pH Rain in Cultural Heritage

Sensitivity improvement of a fibre Bragg grating pH sensor with elastomeric coating

Finite Element Stress Analysis of Optical Fiber due to Mechanical Expansion of Hydrogel Coating

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