Sub-Meter Spatial Resolution Phase-Sensitive Optical Time-Domain Reflectometry System Using Double Interferometers

Feng, Shengwen; Xu, Tuanwei; Huang, Jianfen; Yang, Yang; Ma, Lanqing; Li, Fang

doi:10.3390/app8101899

Cited by 19 publications

(9 citation statements)

References 22 publications

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“…The current consumption of DDSS interrogators is around 200 W (Peng & Chao, 2016;Feng et al, 2018;Richter et al, 2019). Discoveries at the quantum level (Cohen et al, 2015;Favero, 2015) suggest that even very small vibration levels can be detected.…”

Section: Interrogatorsmentioning

confidence: 99%

Fiber optic sensing for volcano monitoring and imaging volcanic processes

Jousset,

Currenti,

Murphy

et al. 2024

Preprint

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This chapter describes fiber optic sensing methodologies and their applications for understanding volcanic structure and processes. We assess their benefits for volcano monitoring and offer possible solutions to address their challenges. The physical principles at the basis of fiber optic sensing technologies have been known for several decades. These principles are related to various processes involving electro-magnetic interactions of light sent by a laser within glass. Intrinsic physical properties of glass within the optical fiber, when engineered appropriately and interrogated with an adequate light source, enable us to access a number of environmental parameters, such as temperature, strain and rotation over a large frequency range. However, only recently developed instruments have been able to sense these parameters efficiently, either at a point or densely in a distributed way for geophysical and volcanological applications. Rotational sensors allow us to measure the rotational components of the seismic wave field, which have been discarded in the past. Distributed fiber optic sensing provides access to quasi-continuous measurements of temperature, strain and strain rate along km-long fibers with a high spatial resolution (meter) and sampling rate (kHz). We show examples on volcanoes both on land and in submarine environments. We demonstrate that data from optical strainmeters, rotational sensors, distributed fiber optic strain and/or temperature sensing can reveal unknown structural features and processes in volcanoes. These examples testify that fiber optic sensing methodologies owe to be implemented as additional tools for improved volcano monitoring and for volcanic crisis management.

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Section: Interrogatorsmentioning

confidence: 99%

Fiber optic sensing for volcano monitoring and imaging volcanic processes

Jousset,

Currenti,

Murphy

et al. 2024

Preprint

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“…However, the spatial resolution of this scheme is still limited by the MZI path difference. A year later, S. Feng et al used two Michelson interferometers with different optical path differences to obtain two RBS phase curves with different spatial resolutions through the PGC algorithm 156 . After adopting the differential and adaptive two-dimensional bilateral filtering algorithm, a spatial resolution of 0.8 m is obtained.…”

Section: Spatial Resolutionmentioning

confidence: 99%

Advances in phase-sensitive optical time-domain reflectometry

Liu¹,

Yu²,

Hong³

et al. 2022

OEA

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Phase-sensitive optical time-domain reflectometry (Φ-OTDR) has attracted numerous attention due to its superior performance in detecting the weak perturbations along the fiber. Relying on the ultra-sensitivity of light phase to the tiny deformation of optical fiber, Φ-OTDR has been treated as a powerful technique with a wide range of applications. It is fundamental to extract the phase of scattering light wave accurately and the methods include coherent detection, I/Q demodulation, 3 by 3 coupler, dual probe pulses, and so on. Meanwhile, researchers have also made great efforts to improve the performance of Φ -OTDR. The frequency response range, the measurement accuracy, the sensing distance, the spatial resolution, and the accuracy of event discrimination, all have been enhanced by various techniques. Furthermore, lots of researches on the applications in various kinds of fields have been carried out, where certain modifications and techniques have been developed. Therefore, Φ-OTDR remains as a booming technique in both researches and applications.

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“…Several studies have shown that DAS systems based on phase-sensitive optical time-domain reflectometry (φ -OTDR) can achieve sub-meter spatial resolution by either sacrificing the sensitivity or using very high speed digitizers [23][24][25][26] . For instance, using 5 ns probe pulses, Masoudi et al 23 have demonstrate a DAS system with 50 cm spatial resolution albeit with a minimum detectable strain amplitude of 40 nε at 200 Hz.…”

Section: Introductionmentioning

confidence: 99%

10-cm spatial resolution distributed acoustic sensor based on an ultra low-loss enhanced backscattering fiber

Masoudi¹,

Lee²,

Beresna³

et al. 2022

Opt. Continuum

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In this work, a distributed acoustic sensor (DAS) with 10 cm spatial resolution is demonstrated. Such a high resolution is achieved by employing an ultra low-loss enhanced backscattering (ULEB) fibre as a sensing element. A conventional DAS system is modified to interrogate the ULEB fibre comprised of 50 discrete reflectors with an average reflectance of −56 dB. The sensing arrangement exhibits a phase noise of 1.9 nε/ √ Hz over 1 km sensing range.

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Sub-Meter Spatial Resolution Phase-Sensitive Optical Time-Domain Reflectometry System Using Double Interferometers

Cited by 19 publications

References 22 publications

Fiber optic sensing for volcano monitoring and imaging volcanic processes

Fiber optic sensing for volcano monitoring and imaging volcanic processes

Advances in phase-sensitive optical time-domain reflectometry

10-cm spatial resolution distributed acoustic sensor based on an ultra low-loss enhanced backscattering fiber

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