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Tomographic Reconstruction of Light Field PIV Based on Backward Ray-Tracing Technique

Cao, Lixia, Zhang, Biao, Hossain, MD Moinul, Li, Jian, Xu, Chuanlong (2020) Tomographic Reconstruction of Light Field PIV Based on Backward Ray-Tracing Technique. Measurement Science and Technology, . ISSN 0957-0233. (doi:10.1088/1361-6501/abd281) (Access to this publication is currently restricted. You may be able to access a copy if URLs are provided) (KAR id:85194)

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https://doi.org/10.1088/1361-6501/abd281

Abstract

The calculation of the weight matrix is one of the key steps of the tomographic reconstruction in the light field particle image velocimetry (light field PIV) system. At present, the existing calculation method of the weight matrix in light field PIV based on the forward ray-tracing technique (named as Fahringer’s method) is very time-consuming. To improve the computational efficiency of the weight matrix, this paper presents a computational method for the weight matrix based on the backward ray-tracing technique in combination with Gaussian function (named as Gaussian function method). An Expectation-Maximization (EM) algorithm is employed for the reconstruction of the 3D particle field, and a summed line-ofsight (SLOS) estimation is further used to accelerate the reconstruction process. The computational accuracy and efficiency of the weight matrix, the reconstruction quality of the 3D particle field, and the velocity field accuracy by Gaussian function method are numerically investigated. Finally, experiments are carried out to verify the feasibility of the weight matrix by Gaussian function method. Numerical results illustrated that Gaussian function method can improve the computational efficiency of the weight matrix by more than 10 times. SLOS is capable of further accelerating the computational efficiency of the overall reconstruction process including the pre-determination, the calculation of the weight matrix and the reconstruction. The velocity field accuracy by Gaussian function method is almost the same as that by Fahringer’s method. The experimental results of the 3D-3C velocity field of a laminar flow further verify the feasibility of the computational method for the weight matrix based on Gaussian function.

Item Type: Article
DOI/Identification number: 10.1088/1361-6501/abd281
Uncontrolled keywords: weight matrix, tomographic reconstruction, particle image velocimetry, backward ray-tracing technique, light field imaging
Subjects: Q Science
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Depositing User: Moinul Hossain
Date Deposited: 24 Dec 2020 22:28 UTC
Last Modified: 16 Feb 2021 14:17 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/85194 (The current URI for this page, for reference purposes)
Hossain, MD Moinul: https://orcid.org/0000-0003-4184-2397
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