Process Tomography System by Electrostatic Charge of Particles

M Machida1, B Scarlett2

1 Pilot Centre, Central Research Laboratories, Idemitsu Kosan Co.,Ltd.

1280 Kamiizumi, Sodegaura, Chiba, 299-0293 Japan, masashi.machida@si.idemitsu.co.jp

2 Engineering Research Centre for Particle Science & Technology 205H Particle Sci. & Tech.

University of Florida Gainesville, Florida 32611,USA, bscarlett@erc.ufl.edu

ABSTRACT

Two methods, the Back Projection method and the Least Squares method, were applied to a electrodynamic tomography system. Electrostatic charges were assumed to exist in the sensing zone and their images were reconstructed using these methods. The reconstructed images were compared with the original ones. The Back Projection method is accurate in detecting the position of the electrostatic charge and is capable of detecting the size of the object. The Back Projection method could not distinguish two charges at separate points in the sensing zone. The Least Squares method could differentiate two points of charge but the reconstructed images were of poor quality due to a large pixel size. A reconstruction algorithm combining the two methods showed better results.

Keywords Electrodynamic tomography, back projection, least square, reconstruction algorithm