Device for performing measurements on a transparent object, method of manufacturing a fiber and fiber manufactured by means of said method
AssigneeU.S. Philips Corporation
InventorsGijsbert Prast, Cornelis M. G. Jochem
Life of this patent
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Abstract
In a device for performing measurements on at least partly transparent objects such as optical fibres a radiation beam is directed on the object. The radiation deflected by the object is imaged by means of a lens system (321, 322) on a radiation-sensitive detection system (330). As a result of refraction on interfaces between areas having a different refractive index (311, 312) in the object and between the object and the surroundings (315), dark or light bands corresponding to the projection of the interfaces are produced on the radiation-sensitive detection system (330). Thus measurements can be performed on the internal structure of the object.
Claims10
A device for the measurement of at least one diameter of an elongated object with a core and at least one transparent layer around said core, said device comprising means for defining a measuring space for accommodating the part of the object to be measured, at least one light source unit outside said measuring space and a light sensitive detection system for detecting light from the measuring space, an objective lens system disposed between the measuring space and the light sensitive detection system, said objective lens system having a limited acceptance angle such that light deflected by the interfaces between the core and transparent layers is not captured by the objective lens system, the objective system imaging the object as a pattern of dark and light bands representing the interface between the core and transparent layers of the object and the distances therebetween.
Dependencies are inferred from the claim text.