Advanced metric for particle image velocimetry accuracy estimation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F44555601%3A13420%2F18%3A43894480" target="_blank" >RIV/44555601:13420/18:43894480 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Advanced metric for particle image velocimetry accuracy estimation

Original language description

The paper describes an algorithm for determination of measurement accuracy at each point using the Particle Image Velocimetry method. Proposed algorithm is based on defining a new correlation plane metric, which is reported as Lost of Particle Ratio LPR. Newly proposed method of calculating the metric, Lost of Particle Ratio, is based on determination of the magnitudes of two correlation peaks. The new metric is defined as the ratio of metric referred to as Mutual Information MI, which respects the total number of particles contributing the signal peak growth and of the magnitude of the autocorrelation peak, which represents the total number of particles within interrogation area IA. The given metric is further corrected by the resultant displacement determined in the last iteration of the Standard Cross Correlation SCC algorithm and also by the gradient value within IA. The whole procedure measurement uncertainty determination is based on the analysis of synthetic data and the use of a pair of tests - Uniform Flow Test UFT and Couette Flow Test CFT. The work discusses the influence of the individual corrections of metrics; the dependencies between the value of such adjusted metrics and measurement uncertainty, including the mutual comparison, are determined. With the help of synthetic test parameterization, a procedure of measurement uncertainty determination is defined based on knowledge of main parameters influencing the measurement accuracy and a suitable metrics shape based on knowledge of main parameters such as density of particles within IA, velocity gradient, size of particle diameter, detected displacement in the last iteration and noise level is designed. In the parameterization of the synthetic tests a different method of gradient definition within the IA was used. The proposed procedure of measurement uncertainty determination using the corrected metric Lost of Particle Ratio is ultimately compared with an approach based on the parameterization of synthetic tests for Standard Cross Correlation algorithm.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20302 - Applied mechanics

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Proceedings of the 19th Symposium on Application of Laser Techniques to Fluid Mechanics.

ISBN

978-989-20-9177-8

ISSN

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e-ISSN

neuvedeno

Number of pages

11

Pages from-to

1-11

Publisher name

Technical University Lisboa

Place of publication

Lisabon

Event location

Lisabon

Event date

Jul 16, 2018

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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