Idellette Judith, Hermine Som Cocquempot, Vincent Degardin, Virginie
Published in
Measurement Science and Technology
In this paper, an efficient method is proposed for detecting and locating a soft fault, i.e. a physical degradation, in a Y-shaped network of unshielded twisted pair cables. The method uses jointly the observability analysis and time-frequency domain reflectometry experimental measurements. The fault detection consists in checking the consistency b...
Huang, Weiquan Li, Menghao Li, Liang Wang, Renlong Wang, Liuqi Wang, Ningbo
Published in
Measurement Science and Technology
The a priori fault probability of the real-time precise satellite orbit and clock correction products is the critical parameter for integrity monitoring of precise point positioning (PPP). The traditional fault probability evaluation methods use the worst-case instantaneous user ranging error (IURE) as the conservative test statistic. However, the ...
Wang, Chen Li, Di He, Qiujie Wang, Meikun Wang, Jiawen Wang, Weitao Liu, Guangqiang Wan, Na Liu, Shouling Yao, Chunmei
...
Published in
Measurement Science and Technology
The differential cross-phase multiply (DCM) demodulation algorithm based on a 3 × 3 coupler is commonly employed in distributed acoustic systems (DAS) to recover phase information along the sensing fiber. This study investigates the amplitude-spatial resolution response characteristics of the DCM algorithm using 3 × 3 coupler demodulation. Firstly,...
Chakraborty, Susanta Sinha, Aloka
Published in
Measurement Science and Technology
A polarized low-coherence interferometer (PLCI) based on a liquid crystal (LC) wedge is designed, and an associated demodulation method encompassing the tunability feature is proposed for tunable, standalone optical sensing. The application of an electric field to the LC material effectively decreases the birefringence value and the related dispers...
Wang, Jian Liu, Xianzeng Zhang, Jun
Published in
Measurement Science and Technology
The sun gear in a planetary gearbox is prone to generate tooth crack due to its much more severe load conditions than other gears. The cracked sun gear will evolve into distinct tooth breakages and thus may deteriorate the operation status and even cause catastrophic loss of the whole transmission system. To avoid tooth crack induced malfunction of...
Xu, Zhenyu Chen, Zhangwei
Published in
Measurement Science and Technology
White light interferometry is a highly precise non-contact measurement technology. However, in practical applications, certain noise sources such as thermal noise, shot noise, and redundant intensity noise, can introduce signal distortion. In this paper, we propose a mathematical formulation for the key metric, Quality Factor, which serves as an ev...
Xu, Ji Xu, Feng Lou, Chenxukun Zhang, Liping Guo, Hun Zuo, Dunwen
Published in
Measurement Science and Technology
Most of the existing studies on roll surface defects focus on qualitative detection and lack quantitative analysis, while the commonly used methods for detecting the three-dimensional shape of small objects such as defects are the stylus method, laser scanning method, and structured light scanning method, but these methods are difficult to accurate...
Wang, Chunyan Xu, Silu Gui, Qihao Jin, Man
Published in
Measurement Science and Technology
Automatic measurement detection in the process of wood processing can effectively improve production efficiency and yield to promote upgrading the wood processing industry. Therefore, this article researches visual detection technology for wood surface measurements and proposes a construction wood measurement detection method based on interval type...
Jhankal, Nitin Kumar Kumar, Arun
Published in
Measurement Science and Technology
The Francis turbines are often operated at the part load (PL) conditions to meet the electricity demand while maintaining system stability. During PL operations, the turbine experiences flow instabilities and vortex formation in the draft tube, leading to potential damage to the turbine. This experimental study focused on measuring pressure fluctua...
Liu, Xiangyu Gan, Xuehui Liao, He Ping, An Qian, Xiaomin Zhang, Xiaoxiao
Published in
Measurement Science and Technology
As chemical fiber filaments diameter variation directly affects spinning quality, spinning condition monitoring becomes more and more important in an intelligent manufacturing environment. Firstly, based on the single-slit Fraunhofer diffraction model and the Babinet principle, the non-contact filaments diffraction model is developed to generate di...
