Time-expanded phase-sensitive optical time-domain reflectometry [PDF]
Light: Science & Applications, 2021 Phase-sensitive optical time-domain reflectometry (ΦOTDR) is a well-established technique that provides spatio-temporal measurements of an environmental variable in real time.
Miguel Soriano-Amat +6 more
doaj +8 more sources
Recent Advances in Brillouin Optical Time Domain Reflectometry [PDF]
Sensors, 2019 In the past two decades Brillouin-based sensors have emerged as a newly-developed optical fiber sensing technology for distributed temperature and strain measurements.
Qing Bai +7 more
doaj +5 more sources
Distributed Fiber Optical Sensing of Oxygen with Optical Time Domain Reflectometry [PDF]
Sensors, 2013 In many biological and environmental applications spatially resolved sensing of molecular oxygen is desirable. A powerful tool for distributed measurements is optical time domain reflectometry (OTDR) which is often used in the field of telecommunications.
Elmar Schmälzlin +2 more
doaj +6 more sources
Synthetic Spectrum Approach for Brillouin Optical Time-Domain Reflectometry [PDF]
Sensors, 2014 We propose a novel method to improve the spatial resolution of Brillouin optical time-domain reflectometry (BOTDR), referred to as synthetic BOTDR (S-BOTDR), and experimentally verify the resolution improvements.
Ken'ichi Nishiguchi +3 more
doaj +5 more sources
Phase-sensitive optical time domain reflectometry based on geometric phase measurement [PDF]
Scientific Reports, 2023 A phase-sensitive optical time domain reflectometer based on coherent heterodyne detection of geometric phase in the beat signal of light, is reported for the first time to our knowledge.
Sabahat Shaheen +2 more
doaj +2 more sources
Application of Intensity-Based Coherent Optical Time Domain Reflectometry to Bridge Monitoring [PDF]
Sensors, 2022 Although distributed fiber sensing techniques have been widely used in structural health monitoring, the measurement results of bridge monitoring, particularly under destructive testing, have rarely been reported. To the best of our knowledge, this paper
Xin Lu +4 more
doaj +2 more sources
A Phase-Sensitive Optical Time Domain Reflectometry with Non-Uniform Frequency Multiplexed NLFM Pulse [PDF]
Sensors, 2023 In the domain of optical fiber distributed acoustic sensing, the persistent challenge of extending sensing distances while concurrently improving spatial resolution and frequency response range has been a complex endeavor.
Zhengyang Li +5 more
doaj +2 more sources
Analysis of Phase-Shift Pulse Brillouin Optical Time-Domain Reflectometry [PDF]
Sensors, 2019 Distributed strain and temperature can be measured by using local Brillouin backscatter in optical fibers based on the strain and temperature dependence of the Brillouin frequency shift.
Tsuneo Horiguchi +2 more
doaj +2 more sources
Coherent-Phase Optical Time Domain Reflectometry for Monitoring High-Temperature Superconducting Magnet Systems [PDF]
SensorsHigh-temperature superconductor (HTS) magnet systems, especially those designed for fusion reactors, require effective and reliable monitoring to avoid damaging anomalies.
Matthew Leoschke +5 more
doaj +2 more sources
A Review of Multiparameter Fiber-Optic Distributed Sensing Techniques for Simultaneous Measurement of Temperature, Strain, and Environmental Effects [PDF]
SensorsThis review summarizes recent progress and emerging trends in multiparameter optical fiber sensing, emphasizing techniques that enable the simultaneous measurement of temperature, strain, acoustic waves, pressure, and other environmental quantities ...
Artem Turov +9 more
doaj +2 more sources