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International Society for Industrial Process Tomography

5th World Congress on Industrial Process Tomography

The Discrete Optical Tomograph Including Five Projections


M. R. Rzasa1, K. Grudzien2, R. Przywarski2, A. Romanowski2, R. Wajman2

1 Chair of Thermal Engineering and Industrial Facilities, Technical University of Opole, Mikolajczyka 5 45-233 Opole POLAND, Email:

2 Technical University of Lodz, Stefanowskiego 18/22, 90-924 Lodz, Computer Engineering Department, Email:


The paper presents an optical tomograph in which a tested object is illuminated from five locations. Measurement of luminous intensity is converted into a discrete signal (0 or 1) in the detectors including 64 optical sensors. Next, the measured results are subjected to reconstruction according to a matrix algorithm of reconstruction. A detailed description of the measuring sensor is presented in the paper. The principle of operation of the electronic system for changing a light signal received by the detector into a discrete electronic signal is discussed. The authors describe a path of the light beam, taking into account optical phenomena occurring at the phase boundary during transmission through the sensor wall and phenomena inside the measuring space. A method of sensor calibration has been analysed and a way of technical realization of the presented problem have been discussed. The presented idea has been elaborated in order to test two-phase gas-liquid flows. However, it can also be applied to objects with a distinct phase boundary.

Keywords Optical tomography, multi-plane reconstruction, gas–solid two-phase flow

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