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Optical Engineering

Tomographic imaging: multiple-fan-beam projection technique using optical fiber sensors
Author(s): Ruzairi Abdul Rahim; Leong Lai Chean; Chan Kok San; Pang Jon Fea; M.H. Fazalul Rahiman
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Paper Abstract

This paper presents the timing advantage of implementing a multiple-fan-beam projection technique using optical fiber sensors for a tomography system. To prepare the sensors to be used for this projection, a collimator is not needed, but optical fiber lens termination is crucial. In this research, the fiber optic lens for transmitters is modeled by experimental methods to transmit light at an emission angle of 30 deg. Due to this small emission angle, a multiprojection technique can be implemented without the light overlapping. A multiple-fan-beam projection technique is here defined as one allowing more than one emitter to project light at the same time using the switch-mode fan-beam method. This method can increase the optical sensor's ability for flow visualization. For the 32 pairs of sensors used, the two-projection technique and four-projection technique were investigated. Sixteen sets of projections formed one frame of light emission for the two-projection technique, and eight sets did so for the four-projection technique. Compared to the conventional single-light projection used in the switch-mode fan-beam method, multiple-light projection can achieve a higher data acquisition rate, thus minimizing data loss and producing a more accurate real-time tomographic image. For four projections the data acquisition rate is 609.76 frames/s.

Paper Details

Date Published: 1 April 2007
PDF: 5 pages
Opt. Eng. 46(4) 047004 doi: 10.1117/1.2720820
Published in: Optical Engineering Volume 46, Issue 4
Show Author Affiliations
Ruzairi Abdul Rahim, Univ. Teknologi Malaysia (Malaysia)
Leong Lai Chean, Univ. Teknologi Malaysia (Malaysia)
Chan Kok San, Univ. Teknologi Malaysia (Malaysia)
Pang Jon Fea, Univ. Teknologi Malaysia (Malaysia)
M.H. Fazalul Rahiman, Univ. Teknologi Malaysia (Malaysia)


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