Study on multidirectional calibration of schlieren computerized tomography system

Lidong Xu; Huajun Cai; Yang Song; Zhenhua Li

doi:10.1117/12.3036371

20 November 2024 Study on multidirectional calibration of schlieren computerized tomography system

Lidong Xu, Huajun Cai, Yang Song, Zhenhua Li

Author Affiliations +

Proceedings Volume 13241, Optical Metrology and Inspection for Industrial Applications XI; 132411S (2024) https://doi.org/10.1117/12.3036371
Event: SPIE/COS Photonics Asia, 2024, Nantong, Jiangsu, China

Conference Poster

Abstract

Schlieren technique is widely used in the visualization and measurement of combustion fields due to its high sensitivity. The data obtained by single-direction schlieren imaging is limited. With the improvement of measurement requirements, schlieren computerized tomography (CT) has become an important research direction. Schlieren CT reconstructs the test field from multidirectional projections. Due to inevitable system installation errors, the projections will be imaged at different positions on the sensors with different light intensities. In this paper, a parallel transmission schlieren CT system is designed with six directions. In order to solve the above problems, firstly, a multidirectional calibration method of schlieren CT based on affine projection is proposed to determine the internal and external parameters of the system. Then, the calibrated schlieren technique is used to establish the quantitative relationship between the grayscale values of the multidirectional schlieren images and the light displacements. With the calibration results, projections can be remapped to a unified coordinate system to reconstruct the three-dimensional distributions of the flow field.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Lidong Xu, Huajun Cai, Yang Song, and Zhenhua Li "Study on multidirectional calibration of schlieren computerized tomography system", Proc. SPIE 13241, Optical Metrology and Inspection for Industrial Applications XI, 132411S (20 November 2024); https://doi.org/10.1117/12.3036371

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