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: mrz@po.opole.pl

2 Technical University of Lodz, Stefanowskiego 18/22, 90-924 Lodz, Computer Engineering Department, Email: kgrudzi@kis.p.lodz.pl

ABSTRACT

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