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Arbitrary position 3D tomography for practical application in combustion diagnostics

Sanned, David LU ; Lindström, Johan LU orcid ; Roth, Adrian LU ; Aldén, Marcus LU and Richter, Mattias LU (2022) In Measurement Science and Technology 33(12).
Abstract

This work aims to make three-dimensional (3D) tomographic techniques more flexible and accessible to in-situ measurements in practical apparatus by allowing arbitrary camera placements that benefit applications with more restrictive optical access. A highly customizable, in-house developed tomographic method is presented, applying smoothness priors through Laplacian matrices and hull constraints based on 3D space carving. The goal of this paper is to showcase a reconstruction method with full user control that can be adopted to various 3D field reconstructions. Simulations and experimental measurements of unsteady premixed CH4/air and ethanol (C2H5OH) diffusion pool flames were evaluated, comparing... (More)

This work aims to make three-dimensional (3D) tomographic techniques more flexible and accessible to in-situ measurements in practical apparatus by allowing arbitrary camera placements that benefit applications with more restrictive optical access. A highly customizable, in-house developed tomographic method is presented, applying smoothness priors through Laplacian matrices and hull constraints based on 3D space carving. The goal of this paper is to showcase a reconstruction method with full user control that can be adopted to various 3D field reconstructions. Simulations and experimental measurements of unsteady premixed CH4/air and ethanol (C2H5OH) diffusion pool flames were evaluated, comparing arbitrarily placed cameras around the probed domain to the more commonly used in-plane-half-circle camera arrangement. Reconstructions reproduced expected topological field features for both flame types. Results showed slight decrease in reconstruction quality for arbitrarily placed cameras compared to in-plane-half-circle arrangement. However, at lower numbers of camera views (N q ⩽ 6) arbitrary placement showed better results. The introduced methodology will be useful for optically limited setups in terms of handling a priori information, camera placement and 3D field evaluation.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
3D, combustion, diagnostics, inverse problem, tomography
in
Measurement Science and Technology
volume
33
issue
12
article number
125206
publisher
IOP Publishing
external identifiers
  • scopus:85139609473
ISSN
0957-0233
DOI
10.1088/1361-6501/ac92a1
language
English
LU publication?
yes
id
e7d40881-34eb-402a-a37c-bfcbd62ca49d
date added to LUP
2022-12-06 14:43:16
date last changed
2025-10-14 10:00:08
@article{e7d40881-34eb-402a-a37c-bfcbd62ca49d,
  abstract     = {{<p>This work aims to make three-dimensional (3D) tomographic techniques more flexible and accessible to in-situ measurements in practical apparatus by allowing arbitrary camera placements that benefit applications with more restrictive optical access. A highly customizable, in-house developed tomographic method is presented, applying smoothness priors through Laplacian matrices and hull constraints based on 3D space carving. The goal of this paper is to showcase a reconstruction method with full user control that can be adopted to various 3D field reconstructions. Simulations and experimental measurements of unsteady premixed CH<sub>4</sub>/air and ethanol (C<sub>2</sub>H<sub>5</sub>OH) diffusion pool flames were evaluated, comparing arbitrarily placed cameras around the probed domain to the more commonly used in-plane-half-circle camera arrangement. Reconstructions reproduced expected topological field features for both flame types. Results showed slight decrease in reconstruction quality for arbitrarily placed cameras compared to in-plane-half-circle arrangement. However, at lower numbers of camera views (N <sub>q</sub> ⩽ 6) arbitrary placement showed better results. The introduced methodology will be useful for optically limited setups in terms of handling a priori information, camera placement and 3D field evaluation.</p>}},
  author       = {{Sanned, David and Lindström, Johan and Roth, Adrian and Aldén, Marcus and Richter, Mattias}},
  issn         = {{0957-0233}},
  keywords     = {{3D; combustion; diagnostics; inverse problem; tomography}},
  language     = {{eng}},
  number       = {{12}},
  publisher    = {{IOP Publishing}},
  series       = {{Measurement Science and Technology}},
  title        = {{Arbitrary position 3D tomography for practical application in combustion diagnostics}},
  url          = {{http://dx.doi.org/10.1088/1361-6501/ac92a1}},
  doi          = {{10.1088/1361-6501/ac92a1}},
  volume       = {{33}},
  year         = {{2022}},
}