A flexible multiplexing method of FBG sensors based on OFDR

Yang, Ning; Zhang, Jiande; Yu, Lijia; Zheng, Ping; Zhao, Bo; Sun, Hualiang; Liu, Qiang

doi:10.1016/j.ijleo.2022.169764

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…In this study, we developed a distributed sensing system for temperature measurement using a single-mode optical fiber as the carrier. We evenly etched a set of identical FBGs on the fiber as temperature sensing points [7]. The system consists of 5 FBGs with a center wavelength of 1530.369nm (T=25℃), a gate area length of 1cm, a grid area distribution interval of 30cm, and a reflectivity of 1%.…”

Section: Introductionmentioning

confidence: 99%

Temperature sensing system based on OFDR demodulation principle for identical weakly reflecting FBGs

Tian,

Liu,

Kong

et al. 2024

International Academic Conference on Optics and Photonics (IACOP 2023)

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Fiber grating sensing technology is a widely used fiber optic sensing technology due to its ability to form a distributed sensing system for measuring multiple parameters. The number of multiplexed gratings and spatial resolution are important performance indicators of fiber Bragg grating (FBG) sensing systems. This paper proposes a fast distributed temperature measurement system based on the Optical Frequency Domain Reflectometry (OFDR) principle, using a single-mode fiber engraved with five identical weak gratings spaced 30cm apart with a reflectivity of 1% as the sensing fiber. To minimize the impact of light source nonlinearity on demodulation, we use the SiO 2 process Mach-Zehnder interferometer (MZI) module with a refractive index difference of 1.5 as an auxiliary interferometer and employ cubic spline interpolation FFT transformation for signal processing. This approach simplifies the design of the laser drive circuit and achieves a temperature resolution of 0.5°C.

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Section: Introductionmentioning

confidence: 99%

Temperature sensing system based on OFDR demodulation principle for identical weakly reflecting FBGs

Tian,

Liu,

Kong

et al. 2024

International Academic Conference on Optics and Photonics (IACOP 2023)

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“…There are studies related to the use of OTDR and OFDR methods for interrogating a large number of weakly reflecting FBGs, which can increase the number of interrogated FBGs by up to several thousand [20][21][22]. When using these methods, addressing the spectral shadowing effect becomes important [23,24]. The use of optical fibers with a large number of weak reflection FBGs instead of standard telecommunication optical fibers, in which Rayleigh scattering is measured, has a number of advantages.…”

Section: Introductionmentioning

confidence: 99%

Distributed Strain Measurements Based on Rayleigh Scattering in the Presence of Fiber Bragg Gratings in an Optical Fiber

Матвеенко

Serovaev

2023

Photonics

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This paper addresses the challenge of strain measurement using distributed fiber-optic sensors based on Rayleigh scattering in the presence of fiber Bragg gratings (FBGs) with a reflectivity level of 70% within the optical fiber. The reflectivity of such FBGs complicates distributed strain measurements that rely on the cross-correlation algorithm. The cases where the scanning ranges of a backscatter reflectometer include the resonant wavelengths of the FBGs and those beyond their limits, resulting in either a complete absence of a useful signal or the emergence of insensitive zones near the FBGs, are considered. An approach is proposed that employs a windowed Fourier transform with Hann window function for signal processing. This method effectively eliminates insensitive zones in distributed strain measurements based on Rayleigh scattering.

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A fiber Bragg grating acceleration sensor based on a circular flexure hinge structure for medium- and high-frequency vibration measurements

Chiang

Ngôn

et al. 2023

Optik

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A flexible multiplexing method of FBG sensors based on OFDR

Cited by 4 publications

References 17 publications

Temperature sensing system based on OFDR demodulation principle for identical weakly reflecting FBGs

Temperature sensing system based on OFDR demodulation principle for identical weakly reflecting FBGs

Distributed Strain Measurements Based on Rayleigh Scattering in the Presence of Fiber Bragg Gratings in an Optical Fiber

A fiber Bragg grating acceleration sensor based on a circular flexure hinge structure for medium- and high-frequency vibration measurements

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