High spatial resolution distributed optical fiber dynamic strain sensor with enhanced frequency and strain resolution

Masoudi, Ali; Newson, T.P.

doi:10.1364/ol.42.000290

Cited by 114 publications

(64 citation statements)

References 8 publications

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“…However, a more precise quantitative measurement of an external disturbance requires additional information on the change in signal behavior induced by strain or temperature changes. To this end, techniques which are based on frequency shift measurements [36][37][38][39] and others using direct demodulation of the phase change [35,[40][41][42][43][44] have been proposed. The frequency shift method for external impact extraction using ϕ-OTDR is based on the observation that the frequency of the probing pulses can be matched with a corresponding change in temperature or strain with some proportionality constant.…”

Section: ϕ-Otdr Sensors For Precise Impact Extraction Using Frequencymentioning

confidence: 99%

“…The technique is used to demonstrate dynamic measurement of strain varying at 5 kHz over a 1 km distance with a minimum detectable strain range of 80 nε [40]. This scheme has recently been improved in terms of the performance in both the spatial and frequency resolutions [41]. The later configuration involves the use of a single FBG to filter the ASE noise both in the propagating pulses and the backscattering signal.…”

Section: ϕ-Otdr Sensors For Precise Impact Extraction Using Frequencymentioning

confidence: 99%

“…A ϕ-OTDR sensor, which emulates the 3 × 3 coupler used in [40,41] and resolves the receiver multiplicity and synchronization issues by making alternate use of a single photodiode and addressing drawbacks of interferometric stability with the use of a double-pulse scheme, has also been proposed [42]. The modulation of the pulses and the operating principle of the configuration is depicted in Figure 13.…”

Section: ϕ-Otdr Sensors For Precise Impact Extraction Using Frequencymentioning

confidence: 99%

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Recent Advances in Distributed Acoustic Sensing Based on Phase-Sensitive Optical Time Domain Reflectometry

Muanenda

2018

Journal of Sensors

122

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Distributed acoustic sensing (DAS) using coherent Rayleigh backscattering in an optical fiber has become a ubiquitous technique for monitoring multiple dynamic events in real time. It has continued to constitute a steadily increasing share of the fiber-optic sensor market, thanks to its interesting applications in many safety, security, and integrity monitoring systems. In this contribution, an overview of the recent advances of research in DAS based on phase-sensitive optical time domain reflectometry (ϕ-OTDR) is provided. Some advanced techniques used to enhance the performance of ϕ-OTDR sensors for measuring backscattering intensity changes through reduction of measurement noise are presented, in addition to methods used to increase the dynamic measurement capacity of ϕ-OTDR schemes beyond conventional limits set by the sensing distance. Recent ϕ-OTDR configurations which significantly enhance the measurement spatial resolution, including those which decouple it from the probing pulse width, are also discussed. Finally, a review of recent advances in more precise quantitative measurement of an external impact based on frequency shift and phase demodulation methods using simple direct detection ϕ-OTDR schemes is given.

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Section: ϕ-Otdr Sensors For Precise Impact Extraction Using Frequencymentioning

confidence: 99%

Section: ϕ-Otdr Sensors For Precise Impact Extraction Using Frequencymentioning

confidence: 99%

Section: ϕ-Otdr Sensors For Precise Impact Extraction Using Frequencymentioning

confidence: 99%

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Recent Advances in Distributed Acoustic Sensing Based on Phase-Sensitive Optical Time Domain Reflectometry

Muanenda

2018

Journal of Sensors

122

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“…Fang et al (Fang 2015) demonstrated an alternative implementation of this technique using an imbalanced Michelson interferometer instead of MZI. More recently, Masoudi and Newson (Masoudi 2017) have proposed a modified the experimental setup and signal processing procedure to improve the sensitivity and spatial resolution of the DVS to 40nε and 50cm, respectively.…”

Section: B) Interferometry Techniquementioning

confidence: 99%

High Frequency Distributed Optical Fibre Dynamic Strain Sensing: A Review

Masoudi¹

2017

Proceedings

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“…Luckily, significant progress has been made in developing distributed optical fiber sensing (DOFS) systems, making them a promising approach for the vibration-sensitive measurement of transportation, due to their fully distributed nature [5][6][7]. The DOFS can locate the external dynamic disturbances at any position of optical fiber with meter-scale spatial resolution over tens of kilometers [8]. Importantly, long distance coverage can be economically achieved with optical fiber as the equivalent sensing arrays.Generally, the DOFS can be divided into Brillouin-based DOFS and Rayleigh-based DOFS in terms of vibration detection.…”

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confidence: 99%

Monitoring Vehicles on Highway by Dual-Channel φ-OTDR

Qin

Zhang

et al. 2020

Applied Sciences

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As a fully distributed sensor, the phase-sensitive optical time domain reflectometer (ϕ-OTDR) has attracted remarkable attention in real-time vibration detection. We present a dual-channel ϕ-OTDR (DC-ϕ-OTDR), formed by two single-channel ϕ-OTDRs (SC-ϕ-OTDR), to monitor running vehicles on a highway. In the double-channel system, an improved algorithm (will be referred to as the CDM&V) is proposed to alleviate the strong dependence of vibration detection on the differential step as in the widely used conventional differential method (CDM). The DC-ϕ-OTDR is first tested over campus road before applying it to locate moving vehicles on the highway. For comparison purposes, both the DC-ϕ-OTDR and SC-ϕ-OTDR are used to monitor the vehicles with respective signal processing methods of the CDM and CDM&V. The experimental results at campus show that the dual-path scheme can undoubtedly reduce vibration misjudgment relative to the single one due to the very small possibility of false measurements occurred simultaneously at the same location in both channels. In signal demodulation, the CDM&V greatly relaxes the constraints on the differencing interval for identifying the vehicle-caused vibration. With a step size of 5 or lower, the CDM fails to locate the running vehicle at z=~8.5 km, but the CDM&V successfully demonstrates the feasible capability of locating the vibration. With an increase in the differential interval, both the CDM and CDM&V are able to detect the vibration signal, but with the latter showing a much better noise suppression performance and hence a larger SNR. Importantly, in comparison with the SC-ϕ-OTDR system, the DC-ϕ-OTDR exhibits a considerable enhanced SNR for the detection signal regardless of which processing algorithm (i.e., CDM, CDM&V) is used. The vehicle locations positioned by the DC-ϕ-OTDR are confirmed by the monitoring cameras. magnetic sensor, inductive loops) and the latter being installed at different places on the highways (e.g., radar sensor, cameras) [1][2][3][4]. These sensor-based technologies of traffic management effectively improve road safety and reduce highway congestion. It should be noted, however, that these sensors can only sense in a discrete manner and should not be deployed in full scale. Luckily, significant progress has been made in developing distributed optical fiber sensing (DOFS) systems, making them a promising approach for the vibration-sensitive measurement of transportation, due to their fully distributed nature [5][6][7]. The DOFS can locate the external dynamic disturbances at any position of optical fiber with meter-scale spatial resolution over tens of kilometers [8]. Importantly, long distance coverage can be economically achieved with optical fiber as the equivalent sensing arrays.Generally, the DOFS can be divided into Brillouin-based DOFS and Rayleigh-based DOFS in terms of vibration detection. Brillouin-based DOFS is limited to the applications of low frequency perturbations over a relatively short sensing length due to its large amounts of time consu...

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High spatial resolution distributed optical fiber dynamic strain sensor with enhanced frequency and strain resolution

Cited by 114 publications

References 8 publications

Recent Advances in Distributed Acoustic Sensing Based on Phase-Sensitive Optical Time Domain Reflectometry

Recent Advances in Distributed Acoustic Sensing Based on Phase-Sensitive Optical Time Domain Reflectometry

High Frequency Distributed Optical Fibre Dynamic Strain Sensing: A Review

Monitoring Vehicles on Highway by Dual-Channel φ-OTDR

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