Analysis of a novel sensor interrogation technique based on fiber cavity ring-down (CRD) loop and OTDR
Sign Up to like & getrecommendations! Published in 2018 at "Optical Fiber Technology"
DOI: 10.1016/j.yofte.2018.04.005
Abstract: Abstract We present the analysis of a remote sensor based on fiber Cavity Ring-Down (CRD) loop interrogated by an Optical Time Domain Reflectometer (OTDR) taking into account both practical limitations and the related signal processing.… read more here.
Keywords: based fiber; otdr; ring crd; cavity ring ... See more keywords
80 km Fading Free Phase-Sensitive Reflectometry Based on Multi-Carrier NLFM Pulse Without Distributed Amplification
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Lightwave Technology"
DOI: 10.1109/jlt.2019.2919671
Abstract: Long range phase-sensitive optical time domain reflectometer (ϕ-OTDR) sensing mainly employs distributed amplification in the sensing fiber. It requires the light to be injected into both ends of the sensing fiber, which reduces the degree… read more here.
Keywords: distributed amplification; phase sensitive; range; amplification ... See more keywords
High-Resolution Chirped-Pulse φ-OTDR by Means of Sub-Bands Processing
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Lightwave Technology"
DOI: 10.1109/jlt.2020.2981741
Abstract: Conventional chirped-pulse (CP) phase-sensitive optical time-domain reflectometry (CP φ-OTDR) allows the interrogation of tens of kilometers of optical fiber with high accuracies of millikelvin or nanostrain. With respect to standard coherent-detection φ-OTDR, it shows increased… read more here.
Keywords: resolution; chirped pulse; spatial resolution; sub bands ... See more keywords
Distributed vibration sensor with a lasing phase-sensitive OTDR.
Sign Up to like & getrecommendations! Published in 2022 at "Optics express"
DOI: 10.1364/oe.476182
Abstract: The authors experimentally demonstrate the operation of a lasing phase-sensitive optical time-domain reflectometer (Φ-OTDR) based on random feedback from a sensing fiber. Here, the full output of the laser provides the sensing signal, in contrast… read more here.
Keywords: lasing phase; phase sensitive; vibration sensor; distributed vibration ... See more keywords
Ultra-low sampling resolution technique for heterodyne phase-OTDR based distributed acoustic sensing.
Sign Up to like & getrecommendations! Published in 2022 at "Optics letters"
DOI: 10.1364/ol.456925
Abstract: Phase-sensitive optical time-domain reflectometry (Φ-OTDR) based on heterodyne detection is widely used for its simple structure and high signal-to-noise ratio (SNR). However, the large amount of raw data of Φ-OTDR places a heavy burden on… read more here.
Keywords: heterodyne; sampling resolution; phase; low sampling ... See more keywords
Concise method for high-precision vibration recovery of Φ-OTDR based on the GF-FastICA algorithm.
Sign Up to like & getrecommendations! Published in 2022 at "Optics letters"
DOI: 10.1364/ol.478931
Abstract: To efficiently restore the vibration signals of a phase-sensitive optical time domain reflectometer (Φ-OTDR), the GF-FastICA joint algorithm is proposed, which combines guided filtering with fast independent component analysis (FastICA). The marked region of vibration… read more here.
Keywords: high precision; method high; concise method; vibration ... See more keywords
Quantitative Analysis of φ-OTDR Spatial Resolution Influenced by NLM Parameters
Sign Up to like & getrecommendations! Published in 2023 at "Photonics"
DOI: 10.3390/photonics10050529
Abstract: Non-local mean (NLM) can significantly improve the signal-to-noise ratio (SNR), but it inevitably reduces the spatial resolution of distributed optical fiber sensors (DFOS), which hinders its practical application and the improvement of DFOS performance. In… read more here.
Keywords: spatial resolution; quantitative analysis; signal broadening; nlm parameters ... See more keywords