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Zhongguo Jiguang = Chinese Journal of Lasers, ISSN 0258-7025, 01/2019, Volume 46, Issue 8, p. 806003
This paper proposes an internally modulated chirped pulse based direct detection type phase sensitive time domain reflectometer (φ-OTDR) system with high... 
Tunable filters | Noise | Direct current | Low cost | Reflectometers | Distributed feedback lasers | Signal to noise ratio
Journal Article
Infrared and Laser Engineering/Hongwai Yu Jiguang Gongcheng, ISSN 1007-2276, 01/2017, Volume 46, Issue 2
To solve the problem that the obtained stimulated Brillouin scattering(SBS) threshold from the measurement of backscattered power and forward transmitted power... 
Optical fibers | Long fibers | Thresholds | Pumps | Scattering | Backscattering | Brillouin zone | Reflectometers
Journal Article
Zhongguo Jiguang = Chinese Journal of Lasers, ISSN 0258-7025, 01/2018, Volume 45, Issue 8, p. 810001
An enhanced phase sensitive optical time-domain reflectometer ( ϕ-OTDR) vibration sensing system based on weak fiber Bragg grating arrays is designed. A weak... 
Optical fibers | Rayleigh scattering | Surveillance systems | Time domain analysis | Vibration measurement | Time division multiplexing | Signal reflection | Perturbation | Frequency ranges | Reflectometers | Demodulation
Journal Article
Yingyong Guangxue = Journal of Applied Optics, ISSN 1002-2082, 01/2017, Volume 38, Issue 4, p. 569
A chaotic-pulse hybrid signal optical time-domain reflectometer(OTDR) was developed.The working principle is to measure the Fresnel reflection and backward... 
Optical fibers | Rayleigh scattering | Time domain analysis | Optical communication | Continuous fibers | Reflectometers | Superposition (mathematics)
Journal Article
Zhongguo Jiguang (Chinese Journal of Lasers), ISSN 0258-7025, 03/2015, Volume 42, Issue 3, pp. 0305001 - 0305006
The technique of combining histogram equalization and gradient method was proposed for the processing of optical fiber sensor signal in a coherent optical time... 
Optical fibers | Histograms | Mathematical analysis | Coherence | Grey scale | Images | Vectors (mathematics) | Reflectometers | Optical pulses
Journal Article
Yadian yu Shengguang/Piezoelectricity and Acousto-optics, ISSN 1004-2474, 01/2015, Volume 37, Issue 2, pp. 187 - 192
The high sensitivity, high operating frequencies (GHz), low power consumption, small size and IC compatible fabrication process of FBAR make this technology... 
Networks | Transducers | Resonant frequencies | Circuits | Detectors | MMIC (circuits) | Piezoelectricity | Sensors | Reflectometers
Journal Article
Hongwai Yu Jiguang Gongcheng = Infrared and Laser Engineering, ISSN 1007-2276, 01/2017, Issue 11, p. 256
Considering that for traditional single-pulse Brillouin Optical Time Domain Reflectometer(BOTDR) system, Brillouin signal is weak and the performance... 
Optical fibers | Multiplication | Computer simulation | Noise | Scattering | Time domain analysis | Decoding | Multiplication & division | Reflectometers | Design optimization | Pulse duration | Coding | Avalanche diodes | Thermal noise | Shot noise | Sensors | Signal to noise ratio
Journal Article
Denki Gakkai Ronbunshi. A, Kiso Zairyo, ISSN 0385-4205, 01/2018, Volume 138, Issue 5, p. 198
Typical reflectometers have their own standards for measurement values, and they cannot evaluate a certain index each other because of lack of common... 
Optical communication | Reflection | Reflectometers | Linearity
Journal Article
Liangzi Dianzi Xuebao / Chinese Journal of Quantum Electronics, ISSN 1007-5461, 01/2015, Volume 32, Issue 1, pp. 123 - 128
An improved signal demodulated method of phase-sensitive optical time domain reflectometer (OTDR) system was proposed. The principle of the method was... 
Windows (intervals) | Fluctuation | Disturbances | Time domain | Digital | Feasibility | Reflectometers | Quantum electronics | Demodulation
Journal Article
by Wu, L-X and Wang, L-J and Lin, X-W and Liu, F
Guangxue Jingmi Gongcheng (Optics and Precision Engineering), ISSN 1004-924X, 12/2010, Volume 18, Issue 12, pp. 2521 - 2529
A conjugated reflectometer was designed to measure, both the total hemispherical reflectance and the specular reflectance of samples in real-time, and it could... 
Reflectivity | Beams (radiation) | Infrared | Apertures | Shells | Collection | Fineness | Reflectometers | Reflectance
Journal Article
Journal of Beijing University of Aeronautics and Astronautics, ISSN 1001-5965, 06/2011, Volume 37, Issue 6, pp. 728 - 732
In order to measure the accurate reflection coefficient of waveguide component at millimeter-wave band, a method for reflectometer calibration was proposed.... 
Errors | Mathematical analysis | Sliding | Mathematical models | Calibration | Reflection coefficient | Reflectometers | Standards
Journal Article
Guangzi Xuebao = Acta Photonica Sinica, ISSN 1004-4213, 01/2019, Issue 8, p. 69
A distributed optical fiber sensing system using a phase-sensitive optical time domain reflectometer monitors the filter bag in the dust collector in real... 
Optical fibers | Vibration | Parameters | Vacuum cleaners | Dust filters | Correlation coefficients | Time domain analysis | Back propagation | Reflectometers | Wavelet | Mathematical analysis | Neural networks | Entropy (Information theory) | Dust collectors | Two dimensional analysis | Recognition
Journal Article
Acta Photonica Sinica, ISSN 1004-4213, 01/2016, Volume 45, Issue 11, pp. 37 - 42
To simplify the system structure and reduce the effect of coherent Rayleigh noise on system performance,a temperature sensing system based on Brillouin optical... 
Optical fibers | Frequency shift | Scattering | Brillouin zone | Time domain | Systems analysis | Detection | Reflectometers
Journal Article
Acta Photonica Sinica, ISSN 1004-4213, 01/2016, Volume 45, Issue 5
By using the theory of coherent detection,a Brillouin optical time domain reflectometer sensing system was proposed based on the external modulation of... 
Accuracy | Lasers | Brillouin zone | Strain measurement | Systems analysis | Fabry-Perot | Reflectometers | Signal to noise ratio
Journal Article
Jiguang Jishu / Laser Technology, ISSN 1001-3806, 01/2016, Volume 40, Issue 4, pp. 615 - 618
In order to optimize the phase sensitive optical time-domain reflectometer (?-OTDR) system, a multi-intrusion detection system was built based on ?-OTDR... 
Optical fibers | Rayleigh scattering | Lasers | Interference | Ripples | Reflectometers | Coherent scattering | Signal to noise ratio
Journal Article
한국지반공학회논문집, ISSN 1229-2427, 2018, Volume 34, Issue 4, pp. 27 - 35
The objective of this study is to demonstrate the suitability of electromagnetic waves for evaluating necking defects in bored piles using electromagnetic... 
Pile integrity | Time-domain reflectometer | Nondestructive evaluation | Necking defect | Electromagnetic wave | 토목공학
Journal Article
Jiguang Jishu = Laser Technology, ISSN 1001-3806, 01/2019, Volume 43, Issue 5, p. 608
When studying the vibration detection of phase sensitive optical time domain reflectometer, the incident of high power laser pulse makes the photodetector... 
Optical fibers | Acousto-optics | Sensitivity analysis | Light amplifiers | Segmentation | Noise | High power lasers | Time domain analysis | Data processing | Optics | Photodiodes | Reflectometers | Modulators | Fiber optics | Semiconductor optical amplifiers | Noise sensitivity | Avalanche diodes | Low noise | Doped fibers | Detection | Erbium | Vibration analysis | Signal to noise ratio
Journal Article
電子情報通信学会技術研究報告. EST, エレクトロニクスシミュレーション, ISSN 0913-5685, 05/2012, Volume 112, pp. 1 - 6
... 
Journal Article
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