论文信息 - Automation and dynamic characterization of light intensity with applications to tapered plastic optical fibre

Automation and dynamic characterization of light intensity with applications to tapered plastic optical fibre

An automated chemical process for tapering highly multimoded plastic optical fibre tapers was developed. On-line monitoring was performed whilst varying the solvent composition to optimize taper formation, in order to obtain repeatable, optically clear and mechanically robust tapers in a minimum time period. A model of the process is presented in terms of fibre core radius and core/cladding refractive index. A relationship between core radius, cladding refractive index and numerical aperture was derived that had application for dynamic prediction and compensation of optical parameters. When characterized with a range of refractive indices, the tapered POF sensor exhibited two distinct regions: the water/alcohol region below 1.4 refractive index units, and the oil region above 1.4 suggesting the sensor's use as an oil-in-water, or water-in-oil sensor. From 95% confidence limits, the accuracy of the POF was ±0.006 refractive index units (to 2 standard deviations) or 0.4% above 1.4. Tapered POF is sensitive to refractive index providing a cheap, easy-to-handle and rugged throwaway sensor for water and beverage process and quality monitoring.

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