Spatially Driven Chemical Species Tomography With Size-Adaptive Hybrid Meshing Scheme

This paper develops a size-adaptive hybrid meshing scheme for Chemical Species Tomography (CST) that is driven by the customized spatial resolution of the sensing region. Traditionally, the entire sensing region in CST is uniformly discretized with the empirically determined density of the meshes. S...

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Bibliographic Details
Published in:IEEE sensors journal 2022-07, Vol.22 (13), p.12728-12737
Main Authors: Zhang, Rui, Si, Jingjing, Enemali, Godwin, Bao, Yong, Liu, Chang
Format: Article
Language:English
Subjects:
Absorption
Chemical species tomography
Combustion
Cooling flows (astrophysics)
Discretization
Electrical impedance tomography
Image reconstruction
Laser beams
mesh
Meshing
Noise levels
Reconstruction
region of interest
Sensors
Signal to noise ratio
Spatial resolution
Tomography
tunable diode laser absorption spectroscopy
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Summary:This paper develops a size-adaptive hybrid meshing scheme for Chemical Species Tomography (CST) that is driven by the customized spatial resolution of the sensing region. Traditionally, the entire sensing region in CST is uniformly discretized with the empirically determined density of the meshes. Such a discretization results in a) waste of computational efforts on the less spatially resolved location; and b) much severer rank deficiency. To solve the above-mentioned issues, we introduce, for the first time, a size-adaptive hybrid meshing scheme for CST. Driven by the spatial resolution, dense meshes are deployed in the region of interest (RoI) to detail the target flow field while sparse ones are deployed out of the RoI to fully consider the physically existing laser absorption. The proposed scheme is numerically validated using a CST sensor with 128 laser beams. The visual and quantitative metric comparisons show that the proposed hybrid-size meshing scheme outperforms the traditionally uniform-size meshing scheme, giving 35% lower image error and 38% less significant dislocation at a typical 35 dB signal-to-noise ratio in the RoI. The proposed hybrid-size meshing scheme significantly facilitates the reconstruction of the industrial combustion processes where the combustion zone is bypassed by cooling flows. In these scenarios, the proposed scheme can adapt a finer resolution to detail the combustion zone, while maintaining the integrity of the physical model by less resolved reconstruction of the bypass flows.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2022.3176116