Next Friday, July 8, 2022, a talk will be given by Mr. Bihai Sun, PhD student from Laboratory for Turbulence Research in Aerospace and Combustion, Monash University in Australia. Mr. Bihai Sun received a Master’s degree from the same university. His research interest includes high fidelity measurement of turbulent flows, leading to the study of coherent structures in those flows.
The seminar will be held on Friday, July 8 from 13-15h in the Aula de Grados 5.1.A01:
Development and uncertainty quantification of a four-dimensional digital holographic PIV/PTV technique using iterative predictive inverse reconstruction.
This talk presents a holographic-based PIV measurement technique, termed four-dimensional digital holographic PIV/PTV (4D-DHPIV/PTV), which can produce time-resolved three-component three-dimensional velocity field measurements. The in-line 4D-DHPIV/PTV methodology builds on the standard digital hologram reconstruction and incorporates advanced digital filtering to remove the virtual image effect, 3-dimensional volume deconvolution to reduce the depth-of-focus problem and the virtual image, followed by an efficient one-pass 3-dimensional clustering algorithm coupled with a predictive inverse reconstruction approach to increase the particle reconstruction dynamic range and 3-dimensional reconstruction domain. The reconstruction process is accelerated using particle position prediction. In addition to the presentation of the details of this novel 4D-DHPIV/PTV method, performance results pertaining to bias particle position error and the uncertainty associated with the particle position are presented as a function of: (i) particle concentration and (ii) the shot noise present in the digitally recorded hologram. An experiment to measure a laminar micro-channel flow has been performed to demonstrate the 4D-DHPIV/PTV methodology.