Proceedings ArticleDOI
Non-intrusive Water Surface Velocity Measurement Using Spatial Cross Correlation Technique
Nitika Sharma,Apurva Naik,M. Selva Balan +2 more
- pp 356-361
TLDR
This paper describes the flow visualization and surface water velocity measurement technique using the non-intrusive method which gives the instantaneous results and is reliable, flexible method which can be applied successfully in many engineering applications.Abstract:
The limitation with the method of calculating surface water velocity is the direct contact of the velocity measurement tool to the flowing water which results in the mechanical wear and high maintenance cost. This paper describes the flow visualization and surface water velocity measurement technique using the non-intrusive method. This system gives the instantaneous results and is reliable, flexible method which can be applied successfully in many engineering applications. It is a distension of a video imaging technique to measure the velocity using the pattern matching method. The system was indigenously developed with the help of CMOS camera and paper particles which were used as the tracer particles. If video is taken from far distance then ortho-rectification is applied to calculate accurate results. Video was recorded at Bombay airport model, CWPRS, Pune under different environmental conditions. The code is written in MATLAB which includes segmentation, pattern matching and post processing steps.read more
Citations
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Proceedings ArticleDOI
Time-domain correlation radar for fluid surface velocity estimation using a 77 GHz sensor platform
Marc A. Mutschler,Christian Erhart,Philipp A. Scharf,Johannes Iberle,Johannes Burgardt,Hubert Mantz,Thomas Walter,Christian Waldschmidt +7 more
TL;DR: In this article, an approach for fluid surface velocity estimation is presented, in which the lag of directly backscattered characteristic surface changes is determined, and the evaluation of the surface velocity which will be discussed, too, bases on a cross correlation of two radar signals.
A real-time two-dimensional correlation speed measurement based on image (EI CONFERENCE)
TL;DR: In this article, a real-time two-dimensional correlation speed measurement was proposed on image processing using high speed CMOS shown in figure 1, a cardboard with images which was fixed in electric control movement device was moving to simulate moving object, the CMOS image sensor gathered image signals of the cardboard and the image signals was output to FPGA after a serials pretreatment such as binaryzation etc.
References
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Journal ArticleDOI
Large‐scale particle image velocimetry for measurements in riverine environments
TL;DR: Large-scale particle image velocimetry (LSPIV) is a nonintrusive approach to measure velocities at the free surface of a water body as mentioned in this paper.
Journal ArticleDOI
Considerations on direct stream flow measurements using video imagery: Outlook and research needs
Marian Muste,Hao-Che Ho,D. Kim +2 more
TL;DR: In this paper, measurements acquired with Large-Scale Particle Image Velocimetry (LSPIV) during normal flows and floods in the Iowa River were compared to the rating curve extrapolated for high flows using a one-to-one discharge-stage relationship.
Journal ArticleDOI
LSPIV implementation for environmental flow in various laboratory and field cases
TL;DR: In this article, the authors describe the implementation of imaged-based LSPIV in eight different environmental flow and hydraulic engineering applications for the investigation of complex configurations with and without sediment transport (bed and suspended loads).
Proceedings ArticleDOI
Correction of the Asymmetrical Circular Projection in DLT Camera Calibration
TL;DR: A camera calibration method using circular control points where the error component of calibration is reduced compared with uncorrected points and the mathematical formulations of the correction terms are discussed.
Book ChapterDOI
Particle Imaging Velocimetry and Its Applications in Hydraulics: A State-of-the-Art Review
TL;DR: An overview of the Particle Imaging Velocimetry (PIV) is given in this article, which has the important advantage of measuring an entire velocity field nonintrusively.