Electronics Letters · 1977 · 102 citations · 1 references
Natural SciencesMaterials EngineeringPhysicsMaterials CharacterizationMetrologyOpticsFiber OpticsNon-destructive EvaluationOptical FibersOptical MetrologyPhysical OpticsRefractive IndexFiber CharacterizationIndex Of Refraction MeasurementNondestructive AnalysisNondestructive EvaluationNondestructive TestingRefractive Index MeasurementRefractive Index ProfileRefractive Index Profiling
A simple and fast nondestructive method of measuring the index profile of an optical-fibre preform is presented. In this method, a laser beam is shone perpendicularly to the preform axis, and the exit angle of its backscattered ray is recorded as a function of the distance of the incident ray from the horizontal axis. A numerical integration involving these exit angles gives the profile.
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