Long Range and cm-Level Spatial Resolution Measurement Using Coherent Optical Frequency Domain Reflectometry With SSB-SC Modulator and Narrow Linewidth Fiber Laser

Koshikiya, Yusuke; Fan, Xinyu; Ito, Fumihiko

doi:10.1109/jlt.2008.928916

Cited by 82 publications

(20 citation statements)

References 17 publications

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“…Fumihiko et al presented a concatenately generated phase method to compensate the nonlinear phase noise and realize a 40 km OFDR system with a spatial resolution of 5 cm [ 30 , 31 , 32 ]. One of the key technologies in this method is a TLS with a high linear tuning using an external single sideband modulator [ 33 ] shown in Figure 7 . The other of the key technologies of this method is to utilize a novel software algorithm for compensation of the nonlinear phase in OFDR, namely a concatenately generated phase method.…”

Section: Compensation Of Nonlinear Phase Noise In Ofdrmentioning

confidence: 99%

Distributed Optical Fiber Sensors Based on Optical Frequency Domain Reflectometry: A review

Ding

Wang

Liu

et al. 2018

Sensors

239

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Distributed optical fiber sensors (DOFS) offer unprecedented features, the most unique one of which is the ability of monitoring variations of the physical and chemical parameters with spatial continuity along the fiber. Among all these distributed sensing techniques, optical frequency domain reflectometry (OFDR) has been given tremendous attention because of its high spatial resolution and large dynamic range. In addition, DOFS based on OFDR have been used to sense many parameters. In this review, we will survey the key technologies for improving sensing range, spatial resolution and sensing performance in DOFS based on OFDR. We also introduce the sensing mechanisms and the applications of DOFS based on OFDR including strain, stress, vibration, temperature, 3D shape, flow, refractive index, magnetic field, radiation, gas and so on.

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Section: Compensation Of Nonlinear Phase Noise In Ofdrmentioning

confidence: 99%

Distributed Optical Fiber Sensors Based on Optical Frequency Domain Reflectometry: A review

Ding

Wang

Liu

et al. 2018

Sensors

239

View full text Add to dashboard Cite

show abstract

“…Since the scattered lightwave is constrained to propagate along the fiber, it is feasible to detect the Rayleigh backscattering (RBS) lightwave via a fiber circulator. There are many implementations to utilize RBS lightwave for distributed sensing [63] and fiber link monitoring [64]. It is noticed that the refractive-index inhomogeneities in the optical fiber are inevitable as the fabrication process can not be perfect.…”

Section: Temporal Speckle-based Spectrum Analyzer (Tssa)mentioning

confidence: 99%

Review on Speckle-Based Spectrum Analyzer

Wan

Fan

2021

Photonic Sens

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Accurate spectral measurement and wavelength determination are fundamental and vital for many fields. A compact spectrum analyzer with high performance is expected to meet the growing requirements, and speckle-based spectrum analyzer is a potential solution. The basic principle is based on using the random medium to establish a speckle-to-wavelength mapping relationship for spectrum reconstruction. This article introduces current speckle-based spectrum analyzers with different schemes and reviews recent advances in this field. Besides, some applications by using speckle-based spectrum analyzers are also introduced. Finally, the existing challenges and the future prospects of using speckle for spectrum recovery are discussed.

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“…Thus, the OFDR recently has developed in stress or strain measurement, Kreger et al (2006) measured the change of stress by figuring out the shift in the Rayleigh backscattering spectrum, which stress measurement resolution narrow down to 1 le. Koshikiya et al (2008) increased the test range to 30 km with coherent optical frequency domain reflectometry with SSB-SC modulator and narrow linewidth fiber laser. Du (2016) optimized the slope filter algorithm to improve the linearity of the light source to measure the vibration signal with a distance of 40 km and located the positions of two vibration points.…”

Section: Introductionmentioning

confidence: 99%

Research and application of an improved internal thrust force measurement system for rock and soil mass based on OFDR

Wang

Liu

2021

Geomatics, Natural Hazards and Risk

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Internal thrust force of unstable rock and soil mass is an essential parameter for prediction of many geological hazard. Currently, fiber bragg grating (FBG) and optical time-domain reflectometer (OTDR) are widely used to measure internal stress of unstable rock and soil mass. However, these methods have disadvantages such as low spatial resolution and the paucity of distributed measurements. This paper develops a quasi-distributed thrust measurement system based on an optical frequency domain reflectometer (OFDR). Firstly, we design an optical fiber stress sensor head using the characteristics of the optical fiber microbending effect. And then, the cubic spline interpolation method is used to compensate for the nonlinear effects of the OFDR. Finally, we implement a laboratory experiment of lateral stress to make error calibration. As a result, the OFDR sensing system achieved a spatial resolution of 20 cm by using a 500 m test fiber, maximum measurement pressure reached 1.059 MPa and relative error is 8.9%. We implemented OFDR in the Chenjiagou landslide located at the Three-Gorge of Chongqing in China. The results showed that this system can accurately locate six fiber stress sensors within the landslide over a range of 0 $ 420 m, obtaining the lateral thrusts as well.

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Long Range and cm-Level Spatial Resolution Measurement Using Coherent Optical Frequency Domain Reflectometry With SSB-SC Modulator and Narrow Linewidth Fiber Laser

Cited by 82 publications

References 17 publications

Distributed Optical Fiber Sensors Based on Optical Frequency Domain Reflectometry: A review

Distributed Optical Fiber Sensors Based on Optical Frequency Domain Reflectometry: A review

Review on Speckle-Based Spectrum Analyzer

Research and application of an improved internal thrust force measurement system for rock and soil mass based on OFDR

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