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Sensors 2010, 10(10), 9512-9528; doi:10.3390/s101009512

Image Reconstruction of a Charge Coupled Device Based Optical Tomographic Instrumentation System for Particle Sizing

1,* , 2,* , 3, 2 and 4
Received: 5 September 2010 / Revised: 5 October 2010 / Accepted: 15 October 2010 / Published: 22 October 2010
(This article belongs to the Section Physical Sensors)
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This research investigates the use of charge coupled device (abbreviated as CCD) linear image sensors in an optical tomographic instrumentation system used for sizing particles. The measurement system, consisting of four CCD linear image sensors are configured around an octagonal shaped flow pipe for a four projections system is explained. The four linear image sensors provide 2,048 pixel imaging with a pixel size of 14 micron × 14 micron, hence constituting a high-resolution system. Image reconstruction for a four-projection optical tomography system is also discussed, where a simple optical model is used to relate attenuation due to variations in optical density, [R], within the measurement section. Expressed in matrix form this represents the forward problem in tomography [S] [R] = [M]. In practice, measurements [M] are used to estimate the optical density distribution by solving the inverse problem [R] = [S]−1[M]. Direct inversion of the sensitivity matrix, [S], is not possible and two approximations are considered and compared—the transpose and the pseudo inverse sensitivity matrices.
Keywords: bubbles velocity; optical tomography; inverse algorithm bubbles velocity; optical tomography; inverse algorithm
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Idroas, M.; Rahim, R.A.; Green, R.G.; Ibrahim, M.N.; Rahiman, M.H.F. Image Reconstruction of a Charge Coupled Device Based Optical Tomographic Instrumentation System for Particle Sizing. Sensors 2010, 10, 9512-9528.

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