Fibre Optic Lens Modelling for Optical Tomography

N. Ramli1, R.G. Green1, R. Abdul Rahim2, K. Evans1 and B. Naylor1.

1School of Engineering, Sheffield Hallam University, Pond Street, Sheffield S1 1WB Email : r.g.green@shu.ac.uk

2Head of Department Control & Instrumentation Engineering, Faculty of Electrical Engineering, Universiti Teknologi Malaysia, KB 791, 80990 Johor Bahru, Johor, Malaysia. Email :

ruzairi@suria.fke.utm.my

Abstract The paper describes an investigation into the preparation of fibre optic sensors for use in process tomography. Simple mathematical models are developed for fibres with polished and lensed terminations. The optimum radius to provide a lens for a specific application is determined. Lensed fibres are produced and their characteristic polar emission determined experimentally. The improvements in beam quality obtained using a combined light stop and aperture stop is presented.

Keywords: Optical Fibres, lensed fibres, Process Tomography, Models