Analysis of Brillouin Frequency Shift in Distributed Optical Fiber Sensor System for Strain and Temperature Monitoring

Lalam, Nageswara; Ng, Wai Pang; Dai, Xuewu; Wu, Qiang; Fu, Yong

doi:10.5220/0005842803330340

Cited by 6 publications

(13 citation statements)

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“…Experimental measurements show an excellent linearity in Brillouin shift dependence on strain and temperature [54]. The relationship between the variations of strain (∆ε), temperature (∆T) and BFS (∆ ν B ) is described as [53] ∆ν…”

Section: Dofs Monitoring Systemmentioning

confidence: 98%

“…Sensors based on optical fibers [45][46][47][48][49][50][51][52][53][54][55][56][57][58] are currently widely used for monitoring infrastructures, bridges, dams, buildings and landslides with many inherent advantages [45] including i) resistance to electromagnetic interference, ii) light weight, iii) small size, iv) high sensitivity, v) high-temperature performance, vi) immunity to corrosion and vii) large bandwidth [46].…”

Section: Dofs Monitoring Systemmentioning

confidence: 99%

“…where n is the effective refractive index, λ 0 the wavelength of the incident light in the void and V a the velocity of the acoustic wave [53]. The BFS is a parameter related to the optical and elastic properties of the fiber [54] and it depends on both material temperature and density; moreover, the elastic properties of silica (glass fibers) are such that an induced strain causes a change in volume and therefore, a variation in the material density.…”

Section: Dofs Monitoring Systemmentioning

confidence: 99%

“…where C T = (1.26 MHz/ • C) and C ε = (0.06 MHz/µε) are, respectively, the temperature and strain coefficients at 1550 nm for a single mode silica fiber [53] (the coefficients values change slightly for different types of single mode fibers). In particular, the fiber used at the Lorano site was calibrated in laboratory in order to obtain the calibration coefficients; the following temperature and strain coefficients were obtained: C T = 1 MHz/ • C and C = 0.05 MHz/µε.…”

Section: Dofs Monitoring Systemmentioning

confidence: 99%

“…temperature [54]. The relationship between the variations of strain (∆ε), temperature (∆T) and BFS (∆ ) is described as [53] ∆ ( ∕ ) = +…”

Section: Dofs Monitoring Systemmentioning

confidence: 99%

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Monitoring of Strain and Temperature in an Open Pit Using Brillouin Distributed Optical Fiber Sensors

Lanciano

Salvini

2020

Sensors

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Marble quarries are quite dangerous environments in which rock falls may occur. As many workers operate in these sites, it is necessary to deal with the matter of safety at work, checking and monitoring the stability conditions of the rock mass. In this paper, some results of an innovative analysis method are shown. It is based on the combination of Distributed Optical Fiber Sensors (DOFS), digital photogrammetry through Unmanned Aerial Vehicle (UAV), topographic, and geotechnical monitoring systems. Although DOFS are currently widely used for studying infrastructures, buildings and landslides, their use in rock marble quarries represents an element of peculiarity. The complex morphologies and the intense temperature range that characterize this environment make this application original. The selected test site is the Lorano open pit which is located in the Apuan Alps (Italy); here, a monitoring system consisting of extensometers, crackmeters, clinometers and a Robotic Total Station has been operating since 2012. From DOFS measurements, strain and temperature values were obtained and validated with displacement data from topographic and geotechnical instruments. These results may provide useful fundamental indications about the rock mass stability for the safety at work and the long-term planning of mining activities.

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Section: Dofs Monitoring Systemmentioning

confidence: 98%

Section: Dofs Monitoring Systemmentioning

confidence: 99%

Section: Dofs Monitoring Systemmentioning

confidence: 99%

Section: Dofs Monitoring Systemmentioning

confidence: 99%

“…temperature [54]. The relationship between the variations of strain (∆ε), temperature (∆T) and BFS (∆ ) is described as [53] ∆ ( ∕ ) = +…”

Section: Dofs Monitoring Systemmentioning

confidence: 99%

See 3 more Smart Citations

Monitoring of Strain and Temperature in an Open Pit Using Brillouin Distributed Optical Fiber Sensors

Lanciano

Salvini

2020

Sensors

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Geomechanical Monitoring of an Underground Bulk Mining Operation Using a Novel Distributed Optical Fiber Strain Sensing Method

Nowak,

Sherizadeh,

Esmaeelpour

et al. 2024

Mining, Metallurgy & Exploration

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Phase effects at stimulated Brillouin scattering

Kasumova

Керимли

Safarova

2023

Optics and Spectroscopy

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In the study of stimulated Brillouin scattering (SBS) in the constant intensity approximation, the spatial behavior of the intensity of the Stokes scattering wave in a medium was investigated. It was found that as a result of nonlinear interaction of waves, the period of spatial beats changes. The intensity of the Stokes scattering component is considered as a function of the phase mismatch, pump and acoustic wave intensities. It is found that the efficiency of the scattering of the backward Stokes wave is affected by the total length of the nonlinear medium. According to the analytical expressions obtained in this work, the choice of the optimal parameters of the problem makes it possible to implement the regime of efficient generation of the Stokes scattering component in SBS. The process of generation and amplification of the Stokes scattering component is compared with experiment. By varying the pump intensity, one can control and manipulate the intensity of the output radiation of the Stokes component. Keywords: SBS, backward Stokes scattering wave, constant intensity approximation.

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Analysis of Brillouin Frequency Shift in Distributed Optical Fiber Sensor System for Strain and Temperature Monitoring

Cited by 6 publications

References 0 publications

Monitoring of Strain and Temperature in an Open Pit Using Brillouin Distributed Optical Fiber Sensors

Monitoring of Strain and Temperature in an Open Pit Using Brillouin Distributed Optical Fiber Sensors

Geomechanical Monitoring of an Underground Bulk Mining Operation Using a Novel Distributed Optical Fiber Strain Sensing Method

Phase effects at stimulated Brillouin scattering

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