The Linearity of Optical Tomography: Sensor Model and Experimental Verification

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Vol. 132, Issue 9, September 2011, pp.40-46

The Linearity of Optical Tomography: Sensor Model and Experimental Verification

¹Siti Zarina MOHD. MUJI, ²Ruzairi ABDUL RAHIM, ³Mohd Hafiz FAZALUL RAHIMAN, ⁴Zulkarnay ZAKARIA,
⁵Elmy Johana MOHAMAD, ⁶Mohd Safirin KARIS

¹Department of Computer Engineering, Faculty of Electrical and Electronic Engineering,
Universiti Tun Hussein Onn Malaysia, 86400, Parit Raja, Batu Pahat, Johor, Malaysia

E-mail: szarina@uthm.edu.my, elmy@uthm.edu.my

²Process Tomography Research Group, Control & Instrumentation Engineering Department,

Faculty of Electrical Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor Bahru, Malaysia

Tel.: +607-5537801

E-mail: ruzairi@fke.utm.my

³Tomography Imaging Research Group, School of Mechatronic Engineering,
Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia

E-mail: hafiz@unimap.edu.my, zulkarnay@unimap.edu.my

Received: 23 June 2011 /Accepted: 19 September 2011 /Published: 27 September 2011

Abstract: The aim of this paper is to show the linearization of optical sensor. Linearity of the sensor response is a must in optical tomography application, which affects the tomogram result. Two types of testing are used namely, testing using voltage parameter and testing with time unit parameter. For the former, the testing is by measuring the voltage when the obstacle is placed between transmitter and receiver. The obstacle diameters are between 0.5 until 3 mm. The latter is also the same testing but the obstacle is bigger than the former which is 59.24 mm and the testing purpose is to measure the time unit spend for the ball when it cut the area of sensing circuit. Both results show a linear relation that proves the optical sensors is suitable for process tomography application.

Keywords: Optical sensor, Optical tomography, Linearity, Voltage, Time

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