Distributed multicore fiber sensors

Zhao, Zhiyong; Tang, Ming; Lu, Chao

doi:10.29026/oea.2020.190024

Cited by 60 publications

(25 citation statements)

References 70 publications

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“…For example, utilizing the space-division multiplexed (SDM) system configuration, MCF represent a desirable platform to develop a compact system to multiplex different distributed sensing techniques. A recent review paper introduced the research progress of MCF based hybrid distributed fiber sensor systems [46].…”

Section: Multiplexed Distributed Sensing Systems Of Botda and Other Distributed Fiber Sensor Technologiesmentioning

confidence: 99%

“…The reported system achieved worst temperature and strain resolutions about 2.2 • C and 40 µε, respectively, in a 6 km sensing range with a 3 m spatial resolution [51]. The research progress of MCF based hybrid distributed fiber sensor systems is reviewed in [46]. with a 3 m spatial resolution [51].…”

Section: Multiplexed Distributed Sensing Systems Of Botda and Other Distributed Fiber Sensor Technologiesmentioning

confidence: 99%

See 1 more Smart Citation

Review of Specialty Fiber Based Brillouin Optical Time Domain Analysis Technology

Humbert

Dong

et al. 2021

Photonics

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Specialty fibers have introduced new functionalities and opportunities in distributed fiber sensing applications. Particularly, Brillouin optical time domain analysis (BOTDA) systems have leveraged the unique features of specialty fibers to achieve performance enhancement in various sensing applications. This paper provides an overview of recent developments of the specialty fibers based BOTDA technologies and their sensing applications. The specialty fibers based BOTDA systems are categorized and reviewed based on the new features or performance enhancements. The prospects of using specialty fibers for BOTDA systems are discussed.

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Section: Multiplexed Distributed Sensing Systems Of Botda and Other Distributed Fiber Sensor Technologiesmentioning

confidence: 99%

Section: Multiplexed Distributed Sensing Systems Of Botda and Other Distributed Fiber Sensor Technologiesmentioning

confidence: 99%

Review of Specialty Fiber Based Brillouin Optical Time Domain Analysis Technology

Humbert

Dong

et al. 2021

Photonics

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“…However, the multiplexing capacity of the FBG strain sensors is limited by the bandwidth of the reflection spectrum. Moreover, the signal crosstalk between the sensors in the FBG sensor network will increase the noise floor of measurement 7 . Hence, the sensing range and spatial coverage density of the high-quality single point optical fiber sensor networks should be further promoted.…”

Section: Introductionmentioning

confidence: 99%

Ultra-high resolution strain sensor network assisted with an LS-SVM based hysteresis model

Liu¹,

Li²,

He³

et al. 2021

OEA

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Optical fiber sensor network has attracted considerable research interests for geoscience applications. However, the sensor capacity and ultra-low frequency noise limits the sensing performance for geoscience data acquisition. To achieve a high-resolution and lager sensing capacity, a strain sensor network is proposed based on phase-sensitive optical time domain reflectometer (φ-OTDR) technology and special packaged fiber with scatter enhanced points (SEPs) array. Specifically, an extra identical fiber with SEPs array which is free of strain is used as the reference fiber, for compensating the ultra-low frequency noise in the φ-OTDR system induced by laser source frequency shift and environment temperature change. Moreover, a hysteresis operator based least square support vector machine (LS-SVM) model is introduced to reduce the compensation residual error generated from the thermal hysteresis nonlinearity between the sensing fiber and reference fiber. In the experiment, the strain sensor network possesses a sensing capacity with 55 sensor elements. The phase bias drift with frequency below 0.1 Hz is effectively compensated by LS-SVM based hysteresis model, and the signal to noise ratio (SNR) of a strain vibration at 0.01 Hz greatly increases by 24 dB compared to that of the sensing fiber for direct compensation. The proposed strain sensor network proves a high dynamic resolution of 10.5 pε•Hz -1/2 above 10 Hz, and ultra-low frequency sensing resolution of 166 pε at 0.001 Hz. It is the first reported a large sensing capacity strain sensor network with sub-nε sensing resolution in mHz frequency range, to the best of our knowledge.

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“…The phase-sensitive OTDR (φ-OTDR) and Brillouin optical time domain analysis (BOTDA) are typical time-domain systems, in which the optical pulse is employed for distributed sensing. In recent twenty years, great advances in devices and schemes have promoted the improvements on the performances of distributed optical fiber sensors, especially in the aspects of long range [6][7][8] , high spatial resolution 9,10 , high accuracy 11,12 , dynamic measurements [13][14][15][16][17] and multi-parameter sensing 18,19 . For the simplest implementation of φ-OTDR, a highly coherent light source is pulse modulated to interrogate the sensing fiber 20 .…”

Section: Introductionmentioning

confidence: 99%

High-sensitivity distributed dynamic strain sensing by combining Rayleigh and Brillouin scattering

Wang¹,

Ba²,

Chu³

et al. 2020

Opto-Electronic Advances

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The phase-sensitive optical time-domain reflectometry (φ-OTDR) is a good candidate for distributed dynamic strain sensing, due to its high sensitivity and fast measurement, which has already been widely used in intrusion monitoring, geophysical exploration, etc. For the frequency scanning based φ-OTDR, the phase change manifests itself as a shift of the intensity distribution. The correlation between the reference and measured spectra is employed for relative strain demodulation, which has imposed the continuous measurement for the absolute strain demodulation. Fortunately, the Brillouin optical time domain analysis (BOTDA) allows for the absolute strain demodulation with only one measurement. In this work, the combination of the φ-OTDR and BOTDA has been proposed and demonstrated by using the same set of frequency-scanning optical pulses, and the frequency-agile technique is also introduced for fast measurements. A 9.9 Hz vibration with a strain range of 500 nε has been measured under two different absolute strains (296.7με and 554.8 με) by integrating the Rayleigh and Brillouin information. The sub-micro strain vibration is demonstrated by the φ-OTDR signal with a high sensitivity of 6.8 nε, while the absolute strain is measured by the BOTDA signal with an accuracy of 5.4 με. The proposed sensor allows for dynamic absolute strain measurements with a high sensitivity, thus opening a door for new possibilities which are yet to be explored.

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Distributed multicore fiber sensors

Cited by 60 publications

References 70 publications

Review of Specialty Fiber Based Brillouin Optical Time Domain Analysis Technology

Review of Specialty Fiber Based Brillouin Optical Time Domain Analysis Technology

Ultra-high resolution strain sensor network assisted with an LS-SVM based hysteresis model

High-sensitivity distributed dynamic strain sensing by combining Rayleigh and Brillouin scattering

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