Results 61 to 70 of about 972 (166)

Simulation Analysis of Mode Hopping Impacts on OFDR Sensing Performance

Photonics
This article examines the impacts of mode hopping on the sensing performance of optical frequency domain reflectometry (OFDR) and explores the potential for developing economical OFDR interrogators employing low-cost distributed feedback (DFB) lasers. By
Qirui Wang, Nageswara Lalam, Kehao Zhao, Shuda Zhong, Guangyin Zhang, Ruishu Wright, Kevin P. Chen   +6 more
doaj   +1 more source

Leakage Diagnosis Technologies for Heating Pipe Networks: A Comprehensive Review of Currently Used Methods

International Journal of Energy Research, Volume 2025, Issue 1, 2025.
The development of district heating systems (DHSs) has increased the demand for leakage diagnosis in heating networks due to its impact on thermal efficiency, heating effectiveness, and security. This paper introduces various leakage diagnosis methods, provides solutions to the challenges of current diagnosis methods, and makes suggestions for future ...
Shengtao Ye, Fuzhong Yu, Min Hao, Menghai Wu, Dandan Chen, Changsheng Bu, Ping Lu, Yuntan Du, Kaige Cui, Dongdong Yuan   +9 more
wiley   +1 more source

Assessing Reliability of cm-Scale Optical Fiber Strain Sensing in High Gradient Configurations through Benchmarking and Mechanical Modelling

e-Journal of Nondestructive Testing
FBG-WDM, FBG-FMCW and OFDR distributed strain monitoring techniques are benchmarked and compared to FEM results, in view of assessing the performance of SHM of complex high-value structures subject to intense stress concentration.
Damiano Gianotti, Sylvain Magne, François Di Paola, Benjamin Sapaly, Yves Van Ingelgem, Iris De Graeve   +5 more
doaj   +1 more source

Breathing Phenomenon of Soil Desiccation Cracking: Insights From Novel Geophysical Observations

Journal of Geophysical Research: Earth Surface, Volume 129, Issue 1, January 2024.
Abstract Drought‐induced soil desiccation cracking is a common natural phenomenon on the earth surface, which plays a significant role in influencing the hydro‐mechanical behavior of soils across various earthen engineering applications. However, there is still a scarcity of related studies investigating how field soil desiccation cracking responds to ...
Jin‐Jian Xu, Chao‐Sheng Tang, Yaowen Yang, Lin Li, Hao Zhang, Qing Cheng, Xi‐Ying Zhang, Bo Liu, Bin Shi   +8 more
wiley   +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

Enhanced Strain Measurement Sensitivity with Gold Nanoparticle‐Doped Distributed Optical Fibre Sensing

Structural Control and Health Monitoring, Volume 2024, Issue 1, 2024.
Nanoparticle‐ (NP‐) doped optical fibres show the potential to increase the signal‐to‐noise ratio and thus the sensitivity of optical fibre strain detection for structural health monitoring. In this paper, our previous experimental/simulation study is extended to a design study for strain monitoring.
Xiang Wang, Yuzhe Xiao, Calvin Rans, Rinze Benedictus, Roger M. Groves, Suparno Mukhopadhyay   +5 more
wiley   +1 more source

معرفی و ارزیابی یک روش برای آشکارسازی رویداد لرزشی با استفاده از حسگر فیبر نوری مبتنی بر بازتاب‌سنجی نوری حوزه فرکانس [PDF]

پدافند غیرعامل
در سال­های اخیر، روش­های مبتنی بر حسگر فیبر نوری توزیع‌شده (DFOS) با توجه به مزایایی همچون ایمنی در برابر تداخل امواج الکترومغناطیسی و ایجاد امکان سنجش توزیعی، مورد توجه قرار گرفته­اند.
محمدصادق خیری دوست, غلامرضا باقرسلیمی, رضا حسن زاده پاک رضائی   +2 more
doaj  

Long-Range OFDR-Based Distributed Vibration Optical Fiber Sensor by Multicharacteristics of Rayleigh Scattering

IEEE Photonics Journal, 2017
We present a long-range optical frequency domain reflectometry (OFDR) based distributed vibration optical fiber sensor (DVOFS) by multicharacteristics of Rayleigh scattering.
Zhenyang Ding, Di Yang, Kun Liu, Junfeng Jiang, Yang Du, Bingkun Li, Minghao Shang, Tiegen Liu   +7 more
doaj   +1 more source

Long-Range High Spatial Resolution Distributed Temperature and Strain Sensing Based on Optical Frequency-Domain Reflectometry

IEEE Photonics Journal, 2014
A novel approach to realize long-range distributed temperature and strain measurement with high spatial resolution, as well as high temperature and strain resolution, is proposed based on optical frequency-domain reflectometry (OFDR).
Jia Song, Wenhai Li, Ping Lu, Yanping Xu, Liang Chen, Xiaoyi Bao   +5 more
doaj   +1 more source

Two-dimensional distributed strain sensing with an Archimedean spiral arrangement in optical frequency domain reflectometry

Nanotechnology and Precision Engineering, 2018
We demonstrate a distributed two-dimensional (2D) strain-sensing system in optical frequency domain reflectometry (OFDR) with an Archimedean spiral arrangement of the sensing fiber.
Yamei Guo, Zhenyang Ding, Kun Liu, Junfeng Jiang, Chenhuan Wang, Tiegen Liu   +5 more
doaj   +1 more source