Results 71 to 80 of about 1,583 (160)

Optical frequency domain reflectometry based on real-time Fourier transformation

Optics Express, 2007
We propose and demonstrate an ultrahigh-speed optical frequency domain reflectometry (OFDR) system based on optical frequency-to-time conversion by pulse time stretching with a linearly chirped fiber Bragg grating (LCFG). This method will be referred to as OFDR based on real-time Fourier transformation (OFDR-RTFT).
Yongwoo, Park, Tae-Jung, Ahn, Jean-Claude, Kieffer, José, Azaña   +3 more
openaire   +2 more sources

Distributed vibration sensing with time-resolved optical frequency-domain reflectometry

Optics Express, 2012
The distributed vibration or dynamic strain information can be obtained using time-resolved optical frequency-domain reflectometry. Time-domain information is resolved by measuring Rayleigh backscatter spectrum in different wavelength ranges which fall in successive time sequence due to the linear wavelength sweep of the tunable laser source with a ...
Da-Peng, Zhou, Zengguang, Qin, Wenhai, Li, Liang, Chen, Xiaoyi, Bao   +4 more
openaire   +2 more sources

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

Sensors (Basel), 2023
Fu C, Sui R, Peng Z, Meng Y, Zhong H, Li M, Yin X, Wang Y.   +7 more
europepmc   +1 more source

Accurate estimation of modulation amplitude in Brillouin optical correlation-domain reflectometry based on Rayleigh noise spectrum

Scientific Reports
In Brillouin optical correlation-domain reflectometry (BOCDR), spatial resolution relies on the modulation amplitude of the light. We propose a Rayleigh-based method that utilizes the spectral width of Rayleigh-induced noise to measure this amplitude ...
Keita Kikuchi, Heeyoung Lee, Ryo Inoue, Kouta Ozaki, Haruki Sasage, Yosuke Mizuno   +5 more
doaj   +1 more source

Distributed measurements of vibration frequency using phase-OTDR with a DFB laser self-stabilized through PM fiber ring cavity

Results in Physics, 2019
We have evaluated the performance of a phase-sensitive optical time domain reflectometry (φ-OTDR) system for vibration measurements utilizing a conventional telecom DFB laser self-stabilized through an external PM optical fiber ring resonator.
J.L. Bueno Escobedo, J. Jason, C.A. López-Mercado, V.V. Spirin, M. Wuilpart, P. Mégret, D.A. Korobko, I.O. Zolotovskiy, A.A. Fotiadi   +8 more
doaj   +1 more source

Young's Modulus-Independent Determination of Fibre Parameters for Rayleigh-Based Optical Frequency Domain Reflectometry from Cryogenic Temperatures up to 353 K. [PDF]

Sensors (Basel), 2023
Girmen C, Dittmar C, Siedenburg T, Gastens M, Wlochal M, König N, Schröder KU, Schael S, Schmitt RH.   +8 more
europepmc   +1 more source

Sensing Accuracy Enhancement of Phase-Sensitive Optical Frequency Domain Reflectometry Using Hybrid Hampel-Median Filter

IEEE Photonics Journal
We propose a novel filter scheme to enhance the sensing accuracy of phase-sensitive optical frequency domain reflectometer (Φ-OFDR) while maintaining high spatial resolution via cascading Hampel filter and median filter.
Yiheng Cheng, Qinlin Zeng, Fei Liu, Fei Cui, Zhi Wang, Dan Li, Benzhang Wang, Xian Zhou   +7 more
doaj   +1 more source

Structural Health Monitoring Using a New Type of Distributed Fiber Optic Smart Textiles in Combination with Optical Frequency Domain Reflectometry (OFDR): Taking a Pedestrian Bridge as Case Study. [PDF]

Sensors (Basel), 2023
Abedin S, Biondi AM, Wu R, Cao L, Wang X.   +4 more
europepmc   +1 more source

A Novel Sensor for Undrained Shear Strength Measurement in Very Soft to Soft Marine Sediments Based on Optical Frequency Domain Reflectometry Technology. [PDF]

Sensors (Basel), 2022
Wu PC, Chen WB, Yin JH, Pan Y, Lou K, Feng WQ.   +5 more
europepmc   +1 more source

A Crack Detection Method for an Insulator Based on the Optical Frequency Domain Reflectometry Fiber Sensing System

Photonics
In this paper, a method for detection of crack locations and the width of basin insulators is proposed. Based on the optical frequency domain reflectometry (OFDR) system, the system utilizes an FBG with high feedback for strain as well as temperature ...
Jing Zhao, Yongqiang Wen, Aodi Yu, Wei Li, Li Xia   +4 more
doaj   +1 more source