Quantification of Submillimeter Displacements by Distributed Optical Fiber Sensors

Buchoud, Edouard; Vrabie, Valériu; Mars, Jérôme; d'Urso, Guy; Girard, Alexandre; Blairon, Sylvain; Hénault, Jean-Marie

doi:10.1109/tim.2015.2485340

Cited by 18 publications

(9 citation statements)

References 25 publications

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“…Specifically, analysis of a Dirac strain distribution associated with fissure detection showed that the DSS system effective SR was controlled to a first order by the interrogator SR for a full width at half maximum of 10 cm of the transfer function and an interrogator SR of 1 m. On the contrary, the system performance was affected primarily by strain transfer if the interrogator SR was reduced down to 1 cm. This implies that ground-fiber strain transfer analyses can recover true ground deformation values given a high interrogator SR (e.g., centimeters or less as assumed by Buchoud et al, 2016), while an additional quantification of the SR effect would be necessary if the SR is limited (particularly for BOTDR commonly used in DSS studies). However, the exact limit of high and low SRs pertaining to ground deformation measurement requires future research.…”

Section: 1029/2019jb018878mentioning

confidence: 99%

“…DFOS technologies used specifically for static strain measurement are also known as distributed FO strain sensing (DFOSS), or simply distributed strain sensing (DSS). Over the past decade, DSS has asserted itself as a versatile method by which to recover the deformation of Earth materials (Buchoud et al, 2016; Habel & Krebber, 2011; Schenato, 2017; Shi et al, 2019; Zhang & Xue, 2019). Among the most widely studied are sediment compaction sensing (Murai et al, 2013; Rabaiotti et al, 2015; Zhang et al, 2018) and landslide instability detection (Denchik et al, 2019; Huntley et al, 2019; Iten et al, 2008; Kogure & Okuda, 2018; Moore et al, 2010; Picarelli et al, 2015; Puzrin et al, 2020; Schenato et al, 2017; Wang et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Toward Distributed Fiber‐Optic Sensing of Subsurface Deformation: A Theoretical Quantification of Ground‐Borehole‐Cable Interaction

et al. 2020

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Fiber‐optic sensing is emerging as a superior means for distributed strain sensing of the subsurface. The ability of an embedded fiber‐optic cable to capture accurate strain profiles depends on the degree of rigid mechanical coupling between the ground and the cable. However, a current challenge in this field is to determine the actual level of ground deformation from strain signatures sensed by the cable deployed in the subsurface; addressing this issue has been hampered by the lack of suitable theoretical methods. Here we propose a two‐step ground‐cable coupling evaluation procedure, whereby we develop analytical formulations to quantify the interaction and interface shear transfer of a ground‐borehole‐cable system. We constrain key model parameters using a data set acquired with a fiber optics‐instrumented borehole for monitoring groundwater‐related sediment compaction. Extensive parametric analyses reveal that increasing the backfill modulus and cable gauge length or decreasing the borehole radius and cable stiffness can improve the quality of strain transferred to the cable from the ground; the effect of ground properties is comparably insignificant. Further, we develop design charts and tables at designated transfer thresholds to facilitate the development and field deployment of fiber sensing elements. Taken together, the theoretical quantification of ground‐cable coupling should improve the state‐of‐the‐art performance of distributed fiber‐optic strain sensing for subsurface ground movements detection and monitoring.

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Section: 1029/2019jb018878mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Toward Distributed Fiber‐Optic Sensing of Subsurface Deformation: A Theoretical Quantification of Ground‐Borehole‐Cable Interaction

et al. 2020

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“…The experiments performed under plane-strain conditions highlight a good agreement between the strain distribution pattern measured by D-FOS with that measured using other measurement techniques (i.e., photogrammetry and particle image velocimetry (PIV)). However, the strain magnitude is much smaller due to low deformation compatibility between the optical sensing cable and soil material [48,49,50,51]. The reliability of the soil strain measurement obtained with D-FOS is fully conditioned by the cable-soil interface failure, which depends heavily on the type of soil [10], as well as on its density and water content.…”

Section: Strain Sensingmentioning

confidence: 99%

Optical Fiber Sensing Cables for Brillouin-Based Distributed Measurements

Bastianini¹,

Sante

Falcetelli

et al. 2019

Sensors

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Brillouin distributed optical fiber sensing (Brillouin D-FOS) is a powerful technology for real-time in situ monitoring of various physical quantities, such as strain, temperature, and pressure. Compared to local or multi-point fiber optic sensing techniques, in Brillouin-based sensing, the optical fiber is interrogated along its complete length with a resolution down to decimeters and with a frequency encoding of the measure information that is not affected by changes in the optical attenuation. The fiber sensing cable plays a significant role since it must ensure a low optical loss and optimal transfer of the measured parameters for a long time and in harsh conditions, e.g., the presence of moisture, corrosion, and relevant mechanical or thermal stresses. In this paper, research and application regarding optical fiber cables for Brillouin distributed sensing are reviewed, connected, and extended. It is shown how appropriate cable design can give a significant contribution toward the successful exploitation of the Brillouin D-FOS technique.

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“…The distributed fibre optic strain sensing (DFOSS) technique provides an elegant solution to this problem by enabling distributed strain measurement along an optical fibre over dozens of kilometres while maintaining a relatively high spatial resolution2345678. Recently this technique has been applied to measure deformations of a variety of earth structures such as slopes191011121314, foundations1516 and cavities and sinkholes171819.…”

mentioning

confidence: 99%

“…The interaction between optical fibre and soil has therefore attracted considerable interest111927282930. Recently an integrated DFOSS- and photogrammetry-based performance evaluation of a small-scale model of sand foundation under surcharge loads has brought our attention to this issue (Supplementary Fig.…”

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confidence: 99%

Role of the interface between distributed fibre optic strain sensor and soil in ground deformation measurement

Zhang

Zhu

Shi

2016

Sci Rep

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Recently the distributed fibre optic strain sensing (DFOSS) technique has been applied to monitor deformations of various earth structures. However, the reliability of soil deformation measurements remains unclear. Here we present an integrated DFOSS- and photogrammetry-based test study on the deformation behaviour of a soil foundation model to highlight the role of strain sensing fibre–soil interface in DFOSS-based geotechnical monitoring. Then we investigate how the fibre–soil interfacial behaviour is influenced by environmental changes, and how the strain distribution along the fibre evolves during progressive interface failure. We observe that the fibre–soil interfacial bond is tightened and the measurement range of the fibre is extended under high densities or low water contents of soil. The plastic zone gradually occupies the whole fibre length when the soil deformation accumulates. Consequently, we derive a theoretical model to simulate the fibre–soil interfacial behaviour throughout the progressive failure process, which accords well with the experimental results. On this basis, we further propose that the reliability of measured strain can be determined by estimating the stress state of the fibre–soil interface. These findings may have important implications for interpreting and evaluating fibre optic strain measurements, and implementing reliable DFOSS-based geotechnical instrumentation.

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Quantification of Submillimeter Displacements by Distributed Optical Fiber Sensors

Cited by 18 publications

References 25 publications

Toward Distributed Fiber‐Optic Sensing of Subsurface Deformation: A Theoretical Quantification of Ground‐Borehole‐Cable Interaction

Toward Distributed Fiber‐Optic Sensing of Subsurface Deformation: A Theoretical Quantification of Ground‐Borehole‐Cable Interaction

Optical Fiber Sensing Cables for Brillouin-Based Distributed Measurements

Role of the interface between distributed fibre optic strain sensor and soil in ground deformation measurement

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