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A method to analyze molecular tagging velocimetry data using the Hough transform.

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A method to analyze molecular tagging velocimetry data using the Hough transform.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Sanchez-Gonzalez, R. North, S. W. Bowersox, R. D. W. McManamen, B.
Description	Country affiliation: United States Author Affiliation: Sanchez-Gonzalez R ( Department of Chemistry, Texas A&M University, 3012 TAMU, College Station, Texas 77843, USA.); McManamen B ( Department of Aerospace Engineering, Texas A&M University, 3141 TAMU, College Station, Texas 77843, USA.); Bowersox RD ( Department of Aerospace Engineering, Texas A&M University, 3141 TAMU, College Station, Texas 77843, USA.); North SW ( Department of Chemistry, Texas A&M University, 3012 TAMU, College Station, Texas 77843, USA.)
Abstract	The development of a method to analyze molecular tagging velocimetry data based on the Hough transform is presented. This method, based on line fitting, parameterizes the grid lines 'written' into a flowfield. Initial proof-of-principle illustration of this method was performed to obtain two-component velocity measurements in the wake of a cylinder in a Mach 4.6 flow, using a data set derived from computational fluid dynamics simulations. The Hough transform is attractive for molecular tagging velocimetry applications since it is capable of discriminating spurious features that can have a biasing effect in the fitting process. Assessment of the precision and accuracy of the method were also performed to show the dependence on analysis window size and signal-to-noise levels. The accuracy of this Hough transform-based method to quantify intersection displacements was determined to be comparable to cross-correlation methods. The employed line parameterization avoids the assumption of linearity in the vicinity of each intersection, which is important in the limit of drastic grid deformations resulting from large velocity gradients common in high-speed flow applications. This Hough transform method has the potential to enable the direct and spatially accurate measurement of local vorticity, which is important in applications involving turbulent flowfields. Finally, two-component velocity determinations using the Hough transform from experimentally obtained images are presented, demonstrating the feasibility of the proposed analysis method.
ISSN	00346748
Issue Number	10
Journal	Review of Scientific Instruments
Volume Number	86
e-ISSN	10897623
Language	English
Publisher	American Institute of Physics
Publisher Date	2015-10-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Physics Discipline Chemistry
Content Type	Text
Resource Type	Article
Subject	Medicine Instrumentation

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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