Concentration measurements of bubbles in a water column using an optical tomography system
Optical tomography provides a means for the determination of the spatial distribution of materials with different optical density in a volume by non-intrusive means. This paper presents results of concentration measurements of gas bubbles in a water column using an optical tomography system. A hydra...
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| Main Authors: | , , , |
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| Format: | Article |
| Published: |
Elsevier
2012
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| Subjects: | |
| Online Access: | http://eprints.utm.my/id/eprint/33016/ http://dx.doi.org/10.1016/j.isatra.2012.04.010 |
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| Institution: | Universiti Teknologi Malaysia |
| Summary: | Optical tomography provides a means for the determination of the spatial distribution of materials with different optical density in a volume by non-intrusive means. This paper presents results of concentration measurements of gas bubbles in a water column using an optical tomography system. A hydraulic flow rig is used to generate vertical air–water two-phase flows with controllable bubble flow rate. Two approaches are investigated. The first aims to obtain an average gas concentration at the measurement section, the second aims to obtain a gas distribution profile by using tomographic imaging. A hybrid back-projection algorithm is used to calculate concentration profiles from measured sensor values to provide a tomographic image of the measurement cross-section. The algorithm combines the characteristic of an optical sensor as a hard field sensor and the linear back projection algorithm. |
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