title: Lensed optical fiber sensors for on-line measurement of flow.
abstract: This paper describes a system using lensed optical fiber sensors that are arranged in the form of two orthogonal projections. The sensors are placed around a process vessel for upstream and downstream measurements. The purpose of the system is for on-line monitoring of particles and droplets being conveyed by a fluid. The lenses were constructed using a custom heating fixture. The fixture enables the lenses to be constructed with similar radii resulting in identical characteristics with minimum differences in transmitted intensity and emission angle. By collimating radiation from two halogen bulbs, radiation can be obtained by the sensors with radiation intensity related to the nature of the media. Each sensor interrogates a finite section of the measurement section. Each sensor provides a view. Parallel sensors provide a projection. Signal processing is carried out on the measured data in the time and frequency domains to investigate the latent information present in the flow signals.
authors.affiliation: Faculty of Electrical Engineering, Universiti Teknologi Malaysia, Johor Bahru.
authors.forename: Sallehuddin
authors.initials: S
authors.lastname: Ibrahim
authors.forename: Robert Garnett
authors.initials: RG
authors.lastname: Green
authors.forename: Ken
authors.initials: K
authors.lastname: Dutton
authors.forename: Ruzairi
authors.initials: R
authors.lastname: Abdul Rahim
mesh_terms: D000465:Algorithms; D004867:Equipment Design; D005336:Fiber Optic Technology / Q000295:instrumentation* / Q000379:methods; D008962:Models, Theoretical; D055100:Optical Fibers; D012212:Rheology / Q000295:instrumentation* / Q000379:methods*