Results 21 to 30 of about 3,461,090 (232)

Moving target detection based on velocity compensation methods in a coherent continuous wave lidar

open access: yesThe Journal of Engineering, 2019
Light Detection and Ranging (lidar) technology has been applied in military and civil areas and shows great potential. However, in coherent lidar detection, significant Doppler Effect and velocity uncertainty result a bad influence on moving target ...
Huixin Huang   +3 more
doaj   +1 more source

Application of laser-based instrumentation for measurement of time-resolved temperature and velocity fields in the thermoacoustic system [PDF]

open access: yes, 2010
This work aims to develop reliable laser-based measurement techniques to enable fundamental heat transfer and fluid flow studies in thermoacoustic systems.
Yu, Z.   +8 more
core   +1 more source

Measurement of Reference Bubble Velocity Vector for a Local 4 Sensor Probe Using Orthogonal High Speed Cameras [PDF]

open access: yes, 2007
In recent years, there has been an increase in the level of interest shown in making flow rate measurements in multiphase flow. This in part has been brought about by the metering requirements of the oil and natural gas industries.
Lucas, Gary, Pradhan, Suman, Zhao, X.
core   +4 more sources

Investigating wind turbine dynamic transient loads using contactless shaft torque measurements

open access: yesThe Journal of Engineering, 2019
The wind industry is showing increasing awareness about the importance of long-term direct shaft mechanical torque measurements to fully understand wind turbine (WT) dynamics, adopt proactive solutions for extreme load mitigation and enhance condition ...
Donatella Zappalá   +3 more
doaj   +1 more source

Real-Time and Long-Distance Measurement of Displacement Based on Optoelectronic Oscillator

open access: yesIEEE Access, 2019
A frequency-encoded real-time and long-distance displacement measurement method based on two cross-referencing optoelectronic oscillators (OEOs) is proposed and experimentally demonstrated.
Zhiqiang Fan   +5 more
doaj   +1 more source

Data Processing Approaches to Measure Velocity of Electromagnetic Gun on Laser Screen in Complex Environment

open access: yesSensors, 2022
The exit velocity of the armature is an important indicator in measuring the launching performance of the electromagnetic gun. The non-contact photoelectric detection technology with the use of a laser screen was applied to the measurement of the ...
Huiyan Hao, Wenyu Liu, Peng Xu, Hui Zhao
doaj   +1 more source

Measurement of Tongue Tip Velocity from Real-Time MRI and Phase-Contrast Cine-MRI in Consonant Production

open access: yesJournal of Imaging, 2020
We evaluate velocity of the tongue tip with magnetic resonance imaging (MRI) using two independent approaches. The first one consists in acquisition with a real-time technique in the mid-sagittal plane.
Karyna Isaieva   +5 more
doaj   +1 more source

Velocity Vector Estimation of Two-Dimensional Flow Field Based on STIV

open access: yesSensors, 2023
As an important part of hydrometry, river discharge monitoring plays an irreplaceable role in the planning and management of water resources and is an essential element and necessary means of river management.
Jianghuai Lu   +2 more
doaj   +1 more source

Exploration and Comprehensive Treatment Technology of Overburden Fracture in UnderlyingGoaf of Reservoir

open access: yesMeikuang Anquan, 2020
Taking the grouting filling treatment project in the goaf of 8712 working face of Huoshizui Coal Mine as the background, based on the theory of mining subsidence and the method of combining borehole wave velocity test and pressure water test, the ...
HUANG Jianfeng, WU Zhang, WANG Yutao, DUAN Peiran, LI Yongqiang, ZHANG Hao
doaj   +1 more source

Performance Evaluation of Cross-Correlation Based Photoacoustic Measurement of a Single Object with Sinusoidal Linear Motion

open access: yesApplied Sciences, 2023
Photoacoustic (PA) velocimetry holds the advantage of detecting ultrasound signals from selective targets sensitive to specific wavelengths of light irradiation.
Kotaro Fujinami, Katsuaki Shirai
doaj   +1 more source

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