Method for measuring concentricity deviation azimuth of optical fiber preform core

Abstract

The invention relates to a method for measuring the concentricity deviation azimuth of an optical fiber preform core, which comprises the steps that: an optical fiber preform is immersed in matching oil having the refractive index identical or similar to that of the cladding of the optical fiber preform and is then subject to parallel slow motion scanning by laser beams in parallel motion, light-penetrating signals are synchronously acquired and recorded; the center of the cladding is determined through the variation of transmitted light intensity, the coordinate values of the center of the cladding on a projective plane of vertical laser in the incident direction are determined by means of incidence stepping-transmission change method; the coordinate values of the centers of the claddings corresponding to circumferentially-different azimuths are determined by rotating by an angle along the rotating direction and repeating the process; and actual deviation azimuth and deviation value of the cross-section cladding are accordingly determined. The method having the characteristics of accurate measurement and great fastness and simplicity can achieve high automation degree by means ofmeasurement instruments and computers, and can repair some optical fiber performs through detection in order to reduce rejection rate and lower production cost.

Description

technical field [0001] The invention relates to a method for measuring the concentricity deviation azimuth of an optical fiber prefabricated rod core layer and a cladding layer, and belongs to the technical field of optical fiber manufacturing. Background technique [0002] As the most important carrier of communication transmission, optical fiber plays an irreplaceable role in the field of communication technology. Optical fiber preform is the base material for optical fiber manufacturing, and the quality of optical fiber depends to a large extent on the preparation quality of optical fiber preform. The concentricity deviation between the core layer and the cladding layer refers to the distance between the center of the core layer and the center of the cladding layer, referred to as the concentricity deviation of the core layer. In the preform preparation process, according to the different preparation processes, there will be a certain concentricity deviation between the...

AI Technical Summary

Problems solved by technology

The former is used to measure the non-circularity of the core layer; the latter includes the measurement of the concentricity of the optical core layer. When measuring the geometric parameters of the core layer, the matching liquid is injected into the refractive index matching liquid box; when measuring the optical fiber cladding When the geometric parameters of the refractive index matching liquid box are not injected into the matching liquid, and the characteristic points of the light intensity distribution are used to determine the boundary between the cladding and the core layer, the measurement process is more complicated, and the characteristic points of the light intensity distribution are used to determine High accuracy requirements are placed on the light collector when measuring the boundary points of the core layer

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