Vol. 120, Issue 9, September 2010, pp.62-69

Optical Tomography System: Charge-coupled Device Linear Image Sensors

¹M. Idroas, ²R. Abdul Rahim, ³M. H. Fazalul Rahiman, ⁴R. G. Green, ²M. N. Ibrahim

¹Faculty of Chemical and Natural Resources Engineering, Universiti Teknologi Malaysia,

81310 Skudai, Johor, Malaysia

²Faculty of Electrical Engineering, Universiti Teknologi Malaysia,

81310 Skudai, Johor, Malaysia

³School of Mechatronic Engineering, Universiti Malaysia Perlis,

02600 Arau, Perlis, Malaysia

⁴School of Engineering, Sheffield Hallam University, Sheffield, United Kingdom

E-mail: mariani@fkkksa.utm.my

Received: 12 August 2010   /Accepted: 14 September 2010   /Published: 27 September 2010

Abstract: This paper discussed an optical tomography system based on charge-coupled device (CCD) linear image sensors. The developed system consists of a lighting system, a measurement section and a data acquisition system. Four CCD linear image sensors are configured around a flow pipe with an octagonal-shaped measurement section, for a four projections system. The four CCD linear image sensors consisting of 2048 pixels with a pixel size of 14 micron by 14 micron are used to produce a high-resolution system. A simple optical model is mapped into the system’s sensitivity matrix to relate the optical attenuation due to variations of optical density within the measurement section. A reconstructed tomographic image is produced based on the model using MATLAB software. The designed instrumentation system is calibrated and tested through different particle size measurements from different projections.

Keywords: Bubbles velocity, Optical tomography, Inverse algorithm

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