Distributed incomplete polarization-OTDR based on polarization maintaining fiber for multi-event detection

Tong, Youwan; Dong, Hui; Wang, Yixin; Sun, Weimin; Wang, Xin; Bai, Jing; Yuan, Haiqing; Zhu, Ning; Liu, Jianguo

doi:10.1016/j.optcom.2015.06.057

Cited by 21 publications

(26 citation statements)

References 13 publications

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“…A glimpse on the works published indicates that infrared spectroscopy is the most common technique utilized. Examples of its use can be found in the photo‐transformation of hydrocarbons,, alcohols,, aldehydes and ketones, acids, dyes,, NO, CO 2 and inorganic molecules …”

Section: Spectroscopies Studies: Case Examplesmentioning

confidence: 99%

Operando Spectroscopy in Photocatalysis

et al. 2018

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The use of operando spectroscopic tools in heterogeneous photocatalysis has experienced a strong drive in recent years. When using operando tools we must, however, consider carefully the fraction of the system to be probed in an in situ cell, that is, the volume under the simultaneous influence of excitation light and the reactants. This is not an obvious task for certain spectroscopies, particularly for those attempting to characterize the physico-chemical state of the catalysts. Herein we provide an analysis of this point applied to spectroscopies such as XAS (X-ray absorption spectroscopy) and complete the analysis of operando tools with those aimed to characterize the surface of the photocatalysts (XPS; X-ray photoelectron spectroscopy) as well as those spectroscopies, such as infrared or Raman, focusing on the study of the reactantÀcatalyst interface.

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Section: Spectroscopies Studies: Case Examplesmentioning

confidence: 99%

Operando Spectroscopy in Photocatalysis

et al. 2018

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“…[1][2][3][4] Up to now, a variety of semiconductors have been fabricated and investigated for wastewater treatment. [5][6][7][8][9] TiO 2 and ZnO are the most widely studied photocatalysts due to their low cost, non-toxicity, high efficiency and good stability. [10][11][12][13] Both TiO 2 and ZnO have a large bandgap (3.0-3.2 eV) [11][12][13] and only respond to UV light which occupies about 5% of the solar spectrum.…”

Section: Introductionmentioning

confidence: 99%

Green synthesis of a AgCl@AgI nanocomposite using Laminaria japonica extract and its application as a visible-light-driven photocatalyst

et al. 2019

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“…Both methods can detect multi-vibration events with different frequencies, but cannot distinguish multiple vibrations when they have the same frequency. Y. Tong et al achieved multi-event detection by employing a polarization maintaining fiber (PMF) as the distributed pressure sensor [13], but it is only suitable for static measurement. N. Linze et al proposed another POTDR to detect multi-vibration events by using fiber Bragg grating (FBG) pairs [14], which is actually not distributed measurement.…”

Section: Introductionmentioning

confidence: 99%

Multi-vibration detection by probe pulses with ergodic SOPs in a POTDR system

Wang

et al. 2018

Opt. Express

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Polarization optical time domain reflectometers (POTDR) can detect vibration of fiber via the change of the state of polarization (SOP) of the Rayleigh backscattered light. For traditional POTDR systems, one key problem is the high misdiagnosis rate when multiple vibrations are simultaneously applied on the sensing fiber due to the random birefringence along the fiber. To solve this problem, we propose in this paper a novel implementation of the POTDR using probe pulses with ergodic SOPs. A series of vibration spectra along the fiber are obtained by sweeping the SOP of the probe pulse. The sum of these vibration spectra, which should be immune to the birefringence of the sensing fiber, is used to analyze the vibration information. Numerical simulation and experiments are carried out to analyze the performance of the proposed system when the input SOPs are traversed with uniform distribution and random distribution. Results show that the misdiagnosis rate of detecting multi-vibration with different frequencies is greatly reduced. In addition, detection of more-than-two vibrations with the same frequency based on POTDR is successfully performed for the first time to the best of our knowledge.

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Distributed incomplete polarization-OTDR based on polarization maintaining fiber for multi-event detection

Cited by 21 publications

References 13 publications

Operando Spectroscopy in Photocatalysis

Operando Spectroscopy in Photocatalysis

Green synthesis of a AgCl@AgI nanocomposite using Laminaria japonica extract and its application as a visible-light-driven photocatalyst

Multi-vibration detection by probe pulses with ergodic SOPs in a POTDR system

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