Results 41 to 50 of about 972 (166)

Physical Simulation Test and Numerical Simulation Study on Force and Deformation of Inclined Shaft Lining Using OFDR Testing Technology

Applied Sciences
The inclined shaft lining cross-section is prone to severe issues such as shaft lining cracking and even structural failure due to geometric irregularity and mechanical complexity, posing significant engineering safety hazards.
Wenjie Yao, Tingting Luo, Weihao Yang, Zhijiang Yang   +3 more
doaj   +1 more source

Soil Crack Width Controls Preferential Flow Velocity Through Drag Partitioning

Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract Preferential flow within soil cracks influences land surface hydrological processes, yet direct quantifying preferential flow velocity (PFV) remains challenging. Here, we develop a method for high‐resolution monitoring and quantifying PFV in soil cracks using optical frequency domain reflectometry (OFDR).
Chang Sun, Chao‐Sheng Tang, Farshid Vahedifard, Ao Dong, Zhan‐Ming Yang, Bin Shi   +5 more
wiley   +1 more source

Optical Fiber Sensors for Safety and Maintenance Monitoring of Linear Infrastructure

Advanced Sensor Research, Volume 5, Issue 5, May 2026.
This review rigorously provides a thorough and detailed overview of the most recent innovations and advancements in the field of railway and pipeline infrastructure monitoring, accomplished through the implementation of cutting‐edge fiber sensing technologies, with a specific emphasis on its two principal technical branches, namely multipoint sensing ...
Shengnan Wu, Yue Cao, Xiaokun Qian, Jianling Wu, Armando Laudati, Vincenzo Romano Marrazzo, Maria Alessandra Cutolo, Giovanni Breglio, Andrea Cusano, Antonello Cutolo, Sailing He   +10 more
wiley   +1 more source

Strain Development During Cure of Partially Pre‐Cured Thermosetting Composites Measured With Distributed Fiber Optic Sensors

Polymer Composites, Volume 47, Issue 8, Page 7155-7169, 20 April 2026.
Schematic representation of the beneficial effect of ply pre‐curing on temperature overshoot, internal strain and warpage during cure of thin and thick thermosetting composites. ABSTRACT Detection of manufacturing‐induced defects in thermosetting composites is crucial to guarantee part quality, safety, and improve manufacturing efficiency.
Francesco Taddei, Giacomo Struzziero, Valentin Ott, Véronique Michaud   +3 more
wiley   +1 more source

Optical Path Testing for Fiber Optic Current Transformers Using Optical Frequency Domain Reflectometry

Photonics
The long-term operational stability of a fiber optic current transformer (FOCT) is critically dependent on the integrity of its internal fiber optic loop.
Yongqiang Wen, Guangtian Ma, Peng Xiang, Li Xia   +3 more
doaj   +1 more source

Measurement Range Enhancement of Rayleigh-Based Optical Frequency Domain Reflectometry With Bidirectional Determination

IEEE Photonics Journal, 2017
We report a noble coherent optical frequency domain reflectometry (OFDR) system that simply enables measurement range enhancement up to full coherence length of a laser source.
Youngwoong Kim, Myoung Jin Kim, Byung Sup Rho, Young Ho Kim   +3 more
doaj   +1 more source

Controlled Source DAS Coupling Tests: Implications for Unburied Deployment on the Moon and Earth

Earth and Space Science, Volume 13, Issue 3, March 2026.
Abstract Moonquake recordings are key to understanding the Moon's internal structure, yet existing data from the Apollo missions are limited. Distributed Acoustic Sensing (DAS) offers a promising alternative to conventional seismometers for future lunar seismic monitoring, particularly due to its robustness and suitability for high‐scattering ...
S. Probst, A. Zandanel, J. O. A. Robertsson, C. M. Donahue   +3 more
wiley   +1 more source

Study on rotation angle and three-zone deformation characterization of hinged structure of mining overburden rock based on OFDR

Meitan kexue jishu
In order to study the fiber optical strain characterization method of the overlying rock structure during mining in a certain mine in northern Shannxi, based on the engineering geological conditions of 12217 working face in Buertai Mine, the strain ...
Qi LIU, Xianglin LIU, Guangyong CAO, Jinhai ZHAO, Changbao JIANG   +4 more
doaj   +1 more source

Bearing Capacity of Tension Steel Piles in Thinly Inter‐Layered Soils: Numerical Class‐A Prediction vs. Field Measurements

International Journal for Numerical and Analytical Methods in Geomechanics, Volume 50, Issue 3, Page 1430-1450, 25 February 2026.
ABSTRACT This study investigates the bearing capacity of tension piles and pile‐soil interaction during loading. Discrepancies between predicted and measured bearing capacities in previous tests motivated the study, where analytical methods showed considerable scatter and uncertainties in design.
Diaa Alkateeb, Jürgen Grabe
wiley   +1 more source

Evaluating the Performance of Functionalized Carbon Structures with Integrated Optical Fiber Sensors under Practical Conditions

Sensors, 2018
An Optical Frequency Domain Reflectometry (OFDR) based fiber optic sensor scheme “embedded„ in concrete for the purpose of structural health monitoring (SHM) of carbon concrete composites (C3) is presented. The design, while strengthening the
Kort Bremer, Lourdes S. M. Alwis, Frank Weigand, Michael Kuhne, Yulong Zheng, Marco Krüger, Reinhard Helbig, Bernhard Roth   +7 more
doaj   +1 more source