General Expression of Poly(Methyl Methacrylate) Optical Fiber Bragg Grating Sensing Response

PMMA based optical fiber Bragg grating (POFBG) sensors are investigated in an environmental chamber with controlled temperature and relative humidity at temperature extended to 70 °C. At below a critical temperature of 50 °C the POFBG sensor exhibits good linearity and sensitivity for both temperature and humidity sensing. Nonlinear responses are observed at higher temperature, giving rise to varying, reduced magnitudes of sensitivities. An important feature of POFBG humidity sensing is observed at above critical temperature where the POFBG humidity sensitivity turns from positive to negative. A theoretical model based on Lorentz–Lorenz equation is presented to estimate the dependence of POFBG refractive index on temperature and relative humidity. The experimental results qualitatively agree with the theoretical analyses.

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“…For a specific temperature/humidity, the Bragg wavelength change of a POFBG against humidity/temperature change can be expressed as [9]…”

Section: Pofbg Wavelength Responses In Extended Temperature Rangementioning

confidence: 99%

“…This consequently gives rise to inconsistent POFBG sensor performance [4]. POFBG Wavelength Responses in Extended Temperature Range For a specific temperature/humidity, the Bragg wavelength change of a POFBG against humidity/temperature change can be expressed as [9]…”

Section: Pofbg Wavelength Responses In Extended Temperature Rangementioning

confidence: 99%

Performances of PMMA-Based Optical Fiber Bragg Grating Sensor in Extended Temperature Range

Zhang

Webb

2021

Photonics

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“…These include high flexibility, low Young's modulus, biocompatibility, and specific sensing properties depending on particular material used [4,5]. For example, temperature sensitivity of Bragg reflectors inscribed in POFs can vary from strongly negative values (< -47 pm/℃) for PMMA fibers [6] up to positive values of 37.7 pm/℃ for CYTOP fibers with polycarbonate overclad [7]. On the one hand, TOPAS and Zeonex POFs are almost insensitive to relative humidity (RH) [8,9], while CYTOP fibers are prospective for temperature-insensitive RH sensing if a pre-strain or a gamma radiation pre-treatment is applied [10,11].…”

Section: Introductionmentioning

confidence: 99%

FBG inscription and interrogation in polypropylene coreless waveguides

Chapalo,

Sarakatsianos,

Konstantaki

et al. 2024

Specialty Optical Fibres VIII

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We present the inscription and characterization of fiber Bragg gratings (FBGs) in polypropylene coreless cylindrical fibers. Polypropylene material offers several advantages, such as strong chemical resistance, biocompatibility, and high tensibility. Therefore, polypropylene FBGs can be useful for sensing in chemically aggressive environments and in biomedical applications. The coreless, cylindrical polypropylene waveguides used in these experiments had a diameter of 150 μm, typical length up to 20 cm, and a refractive index of 1.49. The inscription was performed in the 1550 nm transparency window by using a phase mask technique and 193 nm excimer laser radiation. Inscribed FBGs demonstrated complex multi-peak reflection spectra due to highly multi-mode nature of the polypropylene waveguides. Due to a high attenuation of the polypropylene, the maximum waveguide FBG interrogation length -in reflection-was 6 cm. Gratings characterization demonstrated a strain sensitivity of 0.9 pm/με, a temperature sensitivity of -60.4 pm/℃ and humidityinsensitive behavior.

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“…The development of fiber-optic sensors has enabled the rapid development of the IoT and made sensors increasingly important in applications. (9) Fiber Bragg grating (FBG) sensors, as well as strain sensors, temperature sensors, acceleration sensors, displacement sensors, and so forth, demodulate specific wavelengths generated by external physical parameters. (10) The demodulation system of an FBG sensor contains FBG filters, adjustable Fabry-Perot (F-P) interference filters, and a non-equilibrium Mach-Zehnder (M-Z) interferometer.…”

Section: Introductionmentioning

confidence: 99%

Fiber Bragg Grating Inclinometer-enabled IoT Sensing System with Low Power Consumption and Small Size

Cui¹,

Le²,

Dai³

2021

Sensors and Materials

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The application of fiber Bragg grating (FBG) sensors in the Internet of Things (IoT) has attracted wide attention for promising scenarios, such as remote monitoring of the subsidence of transformer substations, intelligent sensing of the power grid, and monitoring the safety of mines. However, disaster prewarning and forecasting in infrastructure construction require the key technology of remote sensing and monitoring. To resolve the current problems existing in monitoring the subsidence of substations built on a slope, an inclinometer based on FBG sensor technology is developed in this study. The FBG inclinometer sensor includes a rigid unit, a flexible sensing unit, and a connecting pin shaft. The flexible sensing unit is equipped with an FBG beam structure with uniform strength. The designed FBG is arranged symmetrically on the surface of the beam structure to eliminate the influence of temperature on measurement. In addition, a system that uses the FBG inclinometer sensor for remotely monitoring the subsidence of a transformer substation is designed. This system can display the subsidence of the substation on-site or at a remote terminal in real time. Indoor and field tests are carried out on the remote monitoring system. The test results show that the minimum resolution of the system is 0.1 mm and the maximum measurement error is less than 3%, which meet the requirements of on-site use.

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General Expression of Poly(Methyl Methacrylate) Optical Fiber Bragg Grating Sensing Response

Cited by 6 publications

References 20 publications

Performances of PMMA-Based Optical Fiber Bragg Grating Sensor in Extended Temperature Range

Performances of PMMA-Based Optical Fiber Bragg Grating Sensor in Extended Temperature Range

FBG inscription and interrogation in polypropylene coreless waveguides

Fiber Bragg Grating Inclinometer-enabled IoT Sensing System with Low Power Consumption and Small Size

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