A Tomography System Based on Optical and Electrodynamic Sensors Sallehuddin Ibrahim 1, a , Nurfaizah Md Ruhi 2,b , Mohd Amri Md Yunus 3,c , Belal Ghanem 4,d and Mahdi Faramarzi 5,e 1,2,3,4,5 Faculty of Electrical Engineering, Universiti Teknologi Malaysia, Johor, Malaysia a salleh@fke.utm.my, b faizah@yahoo.com, c amri@fke.utm.my, d belal_utm@yahoo.com, e mahdi60f@gmail.com Keywords: Concentration, electrodynamic, optic, tomography. Abstract. This paper presents an investigation on the use of tomography system using using optical and electrodynamic sensors. The system obtains data from both sensors which detect the flow in a process pipe. Information on the flow is processed in order to display the image reconstruction of a solid flow. Introduction Tomography is a novel method of displaying the images of flow without disrupting the flow itself [1]. The image produced represents the concentration profile of the flow. The method is widely used in the medical field. A tomography image is called a slice, as it is like a slice from a loaf of bread. This analogy is suitable, as a slice of bread has a thickness, a tomographic slice corresponds to a certain thickness of the object being scanned. Tomography is not confined to a single sensing mode. Most tomographic system made use a single sensing mode but there are several investigations which explored the use of a combination of two or more sensing modes [2]. A single sensing sytem cannot differentiate between different phases in a flow. Multi-mode tomography system using more than one sensing mode should give better results compared to a single sensing system. Optical tomography has the advantages of being straightforward, inexpensive, fast and safe compared to radiation-based methods such as x-ray and gamma-ray. Electrodynamic tomography has the advantages of being simple, inexpensive and to a large extent has an immunity from the effects of solid accretion which affects other methods [3]. Optical Modeling Optical modeling is based on the optical sensing beam within the conveyor, the greater the active length, the greater the probability of a particle intercepting the light beam of the optical sensing beam within the pipeline. For each individual path length sensor, the voltage increases with increased plastic beads flow rate or in other words the greater the beads intersect a light beam the greater the output voltage [4]. The number of plastic beads intercepting light and the related sensor output voltage is assumed to be linear [5]. The output voltage from the sensors are conditioned so that they are proportional to the rate at which the light beam is intercepted by the beads. The theoretical output of each sensor is determined using the forward problem which provides output when there is no flow and when flow exists. The sensor output voltage is obtained from the following expression, . 0 s t p V l l V   (1) in which Key Engineering Materials Vols. 594-595 (2014) pp 1032-1036 © (2014) Trans Tech Publications, Switzerland doi:10.4028/www.scientific.net/KEM.594-595.1032 All rights reserved. No part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of TTP, www.ttp.net. (ID: 161.139.101.81-08/11/13,14:23:58)