This paper describes an investigation into the use of optical fibre se
nsors in a tomographic measurement system designed to measure the Row
of dry solids in gravity drop and pneumatic conveyors. A simple model
of the system is provided and used to predict the response of individu
al sensors and the full system. Results are provided which show the mo
del is acceptable for use in a gravity conveyor. The system is used to
provide tomographic images of so lid concentration within a gravity c
hute. (C) 1998 Elsevier Science S.A.