Results 31 to 40 of about 972 (166)

OFDR with double interrogation for dynamic quasi-distributed sensing

Optics Express, 2014
A method for phase sensitive quasi-distributed vibration and acoustical sensing is presented. The method is based on double optical frequency domain reflectometry interrogation of a sensing fiber with an array of discrete weak reflectors. Two replicas of the interrogation signal are launched into the sensing fiber.
Adva Bar, Am, Dror, Arbel, Avishay, Eyal
openaire   +2 more sources

Signal Processing in Optical Frequency Domain Reflectometry Systems Based on Self-Sweeping Fiber Laser with Continuous-Wave Intensity Dynamics

Algorithms, 2023
We report on the development of an optical frequency domain reflectometry (OFDR) system based on a continuous-wave Er-doped self-sweeping fiber laser. In this work, we investigate the influence of the input data processing procedure in an OFDR system on ...
Nikita R. Poddubrovskii, Ivan A. Lobach, Sergey I. Kablukov   +2 more
doaj   +1 more source

A Spatially Distributed Fiber-Optic Temperature Sensor for Applications in the Steel Industry

Sensors, 2020
This paper presents a spatially distributed fiber-optic sensor system designed for demanding applications, like temperature measurements in the steel industry.
Muhammad Roman, Damilola Balogun, Yiyang Zhuang, Rex E. Gerald, Laura Bartlett, Ronald J. O’Malley, Jie Huang   +6 more
doaj   +1 more source

Incoherent Optical Frequency-Domain Reflectometry Based on Homodyne Electro-Optic Downconversion for Fiber-Optic Sensor Interrogation

Sensors, 2019
Fiber-optics sensors using interrogation based on incoherent optical frequency-domain reflectometry (I-OFDR) offer benefits such as the high stability of interference in the radio-frequency (RF) domain and the high SNR due to narrowband RF detection. One
Juan Clement, Haroldo Maestre, Germán Torregrosa, Carlos R. Fernández-Pousa   +3 more
doaj   +1 more source

A Universal Phase Error Analysis for Optical Frequency Tuning Lasers Utilized in Fiber Sensing with OFDR

Photonics, 2022
As optical fiber sensing has attracted increasing attention due to its advantages such as high accuracy, low costs, and stability, its optical source judgment has become an attractive issue by which to characterize its performance.
Zheyi Yao, Zhewen Yuan, Guohua Gu, Qian Chen, Xiubao Sui   +4 more
doaj   +1 more source

OFDR diagnostics for fibre and integrated-optic systems

Electronics Letters, 1985
Optical frequency-domain reflectometry (OFDR) shows promise as a diagnostic tool for high-resolution ranging in fibre/integrated-optic systems, and in high-resolution distributed fibre-optic sensors. We discuss some signal processing aspects of this technology, potential performance and application.
S.A. Kingsley, D.E.N. Davies
openaire   +1 more source

Design of an OFDR-based full-area intelligent and precise temperature measurement system for belt conveyors

Gong-kuang zidonghua
Rapid and precise measurement of temperature along the belt conveyor plays a core role in preventing external fire hazards in coal mines. Distributed optical fiber temperature measurement based on Optical Time-Domain Reflectometry (OTDR) is currently the
REN Baojiang, TANG Min, DU Feng, FU Jiaxing, GAO Guiheng, CUI Ming, WANG Zhihao   +6 more
doaj   +1 more source

Distributed Refractive Index Sensing Based on Etched Ge-Doped SMF in Optical Frequency Domain Reflectometry

Sensors, 2023
A distributed optical fiber refractive index sensor based on etched Ge-doped SMF in optical frequency domain reflection (OFDR) was proposed and demonstrated. The etched Ge-doped SMF was obtained by only using wet-etching, i.e., hydrofluoric acid solution.
Cailing Fu, Ronglong Sui, Zhenwei Peng, Yanjie Meng, Huajian Zhong, Mingquan Li, Xiaoyu Yin, Yiping Wang   +7 more
doaj   +1 more source

Method for Improving Spatial Resolution and Amplitude by Optimized Deskew Filter in Long-Range OFDR

IEEE Photonics Journal, 2014
We present a method for improving the spatial resolution and the amplitude by an optimized deskew filter in long-range optical frequency-domain reflectometry (OFDR).
Yang Du, Tiegen Liu, Zhenyang Ding, Bowen Feng, Xiaobo Li, Kun Liu, Junfeng Jiang   +6 more
doaj   +1 more source

Decoding Dual Regulatory Layers: Integrating Differential Expression and Alternative Splicing Dynamics in the Evolution of Laryngeal Echolocation Across Chiropteran Lineages

Integrative Zoology, EarlyView.
We integrated short‐read and long‐read RNA‐seq data from cochlear tissues of echolocating and non‐echolocating bats to disentangle transcriptional and post‐transcriptional regulation. Echolocating bats showed neural‐function enrichment among differentially expressed genes, while alternatively spliced genes were linked to epigenetic regulation. Overlaps
Jianyu Wu, Daoyuan Hu, Min Chen, Xiuguang Mao   +3 more
wiley   +1 more source