High sensitivity distributed temperature fiber sensor using stimulated Brillouin scattering
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TL;DR: In this article, a distributed higher order Stokes SBS temperature fiber-sensor was proposed to increase the achievable sensitivity to over 4 MHz/°C by using time-gating for distributed sensing.
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Abstract: Optical fiber technology has become a very powerful tool for distributed temperature (strain and refractive index) sensing, and can be used to monitor critical infrastructures such as bridges, aircrafts, pipelines, etc. Stimulated Brillouin scattering (SBS) in optical fibers used for distributed sensing utilizing the first Stokes order, is limited to a fixed material property, 1.1 MHz/°C for SMF-28. We demonstrate a distributed higher order Stokes SBS temperature fiber-sensor increasing the achievable sensitivity by several folds to over 4 MHz/°C. The proposed system uses time-gating for distributed sensing. This allows the increase in sensitivity by the order of the Stokes waves generated while maintaining a fairly normal spatial resolution over a few kilometers of sensing length. Increased sensitivity on these types of sensors may allow an earlier detection which could prevent failure of the monitored structure.
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Citations
High-sensitivity optical fiber temperature sensor of cascaded FSI and MZI based on Vernier effect
TL;DR: In this article, a high-sensitivity optical fiber temperature sensor based on the Vernier effect of cascaded fiber Sagnac interferometer (FSI) and Mach-Zehnder interferometers (MZI) is proposed and experimentally demonstrated.
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Fiber Optic Temperature Sensor With Online Controllable Sensitivity Based on Vernier Effect
Maolin Dai,Zhenmin Chen,Yuanfang Zhao,Xin Mu,Xuanyi Liu,M. S. Aruna Gandhi,Qian Li,Shengzhen Lu,Shen Liu,H. Y. Fu +9 more
TL;DR: In this paper, a temperature sensor with controllable sensitivity based on Vernier effect by cascading a tunable extrinsic Fabry-Perot interferometer (FPI) and a fixed reflective Lyot filter (RLF) is theoretically investigated and experimentally demonstrated.
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Power Fluctuations and Random Lasing in Multiwavelength Brillouin Erbium-Doped Fiber Lasers
TL;DR: In this paper, the power fluctuations of the temporal interference signal produced by up to 5 Stokes orders generated by cascaded stimulated Brillouin scattering in a multiwavelength erbium-doped fiber laser system with a 2.5km-long intracavity fiber and erbinium-based fiber amplifier were investigated.
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Triple Brillouin frequency spacing Brillouin fiber laser sensor for temperature measurement
TL;DR: In this paper, a triple Brillouin frequency spacing sensor for temperature measurement is proposed and demonstrated, where the 1st-order Stokes (S1) and 3rd-order stokes(S3) and 2nd-order STokes (2nd-Order Stokes) are generated by a triple-branching triple-Brillouin fiber laser sensor.
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Single-mode narrow-linewidth fiber ring laser with SBS-assisted parity-time symmetry for mode selection.
TL;DR: In this paper , a single-longitudinal-mode narrow-linewidth fiber ring laser with stimulated Brillouin scattering (SBS) assisted parity-time (PT) symmetry for mode selection in a single fiber loop is proposed and experimentally demonstrated.
16
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