Temperature and strain sensing characteristics of the tilted fiber Bragg grating

Zhang, Weihua; Yang, Baohe; Tong, Zhengrong; Miao, Yinping; Liu, Bo; Dong, Xinyong

doi:10.1007/s11801-010-9030-x

Cited by 6 publications

(5 citation statements)

References 9 publications

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“…FBG sensors have been widely used for strain and temperature measurement [1]. A tilted FBG (TFBG) was recently studied for temperature and strain measurement by Zhang et al [2]. The transmitted spectrum of a TFBG is composed of several discrete modes that arise from two different mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Temperature-Independent Curvature Sensor Using FBG Cladding Modes Based on a Core Misaligned Splice

Gouveia

Jorge

Baptista

et al. 2011

IEEE Photon. Technol. Lett.

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A fiber-optic curvature sensor based on a core offset single-mode fiber (SMF) combined with a fiber Bragg grating (FBG) is presented. The FBG cladding modes are efficiently excited by the large core misalignment. The curvature of the fiber can be obtained by the ratio between the recoupled cladding mode power and the reflected core mode power. These measurements are independent from temperature variation.

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Section: Introductionmentioning

confidence: 99%

Temperature-Independent Curvature Sensor Using FBG Cladding Modes Based on a Core Misaligned Splice

Gouveia

Jorge

Baptista

et al. 2011

IEEE Photon. Technol. Lett.

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“…In this case, the values of the two coefficients are low, which causes the resonance peak of each mode shift to a longer wavelength to nearly the same extent with an increase in the temperature. 29 In terms of strain effect, the resonant wavelength of each mode exhibits a different wavelength shift under the same strain due to different photoelastic constants. Furthermore, when the cladding modes propagate within the interface region between the cladding and the external environment, the effective refractive indices are also sensitive to the ambient refractive index.…”

Section: Theory Of Tilted Fiber Bragg Grating Sensingmentioning

confidence: 99%

Single weakly tilted FBG in 2-μm band capable of measuring temperature, axial strain, and surrounding refractive index

et al. 2018

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Optical fiber devices and applications in the 2-μm band have been investigated extensively due to its unique advantages, such as eye safety. A fiber sensor based on tilted fiber Bragg grating with a grating plane angle of 2 deg is fabricated and experimentally tested. To the best of the authors' knowledge, this is the first tilted fiber Bragg grating sensor to realize simultaneous measurements of temperature, axial strain, and a certain range of surrounding refractive index (SRI) at the 2-μm band. This paper uses the wavelength detection method and selects three independent resonant wavelengths as the investigated parameters. Results show that perturbations of temperature, axial strain, and SRI can shift the wavelengths of the core mode resonance and cladding mode resonance to some degree. The temperature sensitivities of the core mode and cladding mode are nearly the same, but their axial-strain sensitivities are different. Furthermore, the core mode is insensitive to the change in SRI. The sensitivities of SRI, temperature, and strain can thus be obtained by experimentally determining the wavelength shifts of the three independent resonance peaks. A 3 × 3 matrix containing the relationship coefficients between the disturbances of temperature, axial strain, and SRI and wavelength shifts is constructed. By reversely solving the matrix equation, variations in temperature, strain, and SRI can be obtained using the experimental determination of wavelength drifts.

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“…The difference of wavelength shifts between the stain sensor and the temperature sensor represents the pure strain 4 . In practical applications, strain FBG and temperature FBG are glued on the same material to obtain the same coefficient of thermal expansion.…”

Section: Operation Principlementioning

confidence: 99%

Strain-temperature monitor of high speed railway switch by fiber Bragg grating gauges

Huang

Cheng

et al. 2010

SPIE Proceedings

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On the 350km/h high speed railway there is a seamless track switch on a bridge. 32 Fiber Bragg Grating (FGB) gauges are used along the neutral line of the tracks to monitor the strain generated by thermal, geological and vibrational factors, and these FBG strain gauges have the function of strain expansion. Meanwhile other 6 FBG sensors are used to measure the temperature for strain compensating purpose. The Finite Element Analysis method is used to analyze the special shape of the gauges. A testing unit was used to test the FBG gauges and bare FBG on the track samples under measurable pressure and tension. The fixing and encapsulating technology of FBG gauges on the surface of the track and to protect the fiber cable to survive in the harsh conditions are discussed. The strain status of switch tracks could be obtained by processing the data from FBG strain gauges and FBG temperature sensors. The results of measurement showed that in 9 days, the strain in the track shifted 350 με, and the strain curves closely correlated with the temperature curves.

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Temperature and strain sensing characteristics of the tilted fiber Bragg grating

Cited by 6 publications

References 9 publications

Temperature-Independent Curvature Sensor Using FBG Cladding Modes Based on a Core Misaligned Splice

Temperature-Independent Curvature Sensor Using FBG Cladding Modes Based on a Core Misaligned Splice

Single weakly tilted FBG in 2-μm band capable of measuring temperature, axial strain, and surrounding refractive index

Strain-temperature monitor of high speed railway switch by fiber Bragg grating gauges

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