Apparatus and method for inspecting elliplicity and eccentricity of optical fiber preforms,申请号US19930111664-传众专利搜索

Apparatus and method for inspecting elliplicity and eccentricity of optical fiber preforms

申请公布号：US5408309(A)

申请号：US19930111664

申请日期：1993.08.25

申请公布日期：1995.04.18

申请人：

SHIN-ETSU CHEMICAL CO., LTD.

发明人：SHIMADA, TADAKATSU;KOYA, KAZUO

分类号：G01B11/24;G02B6/38;(IPC1-7):G01B11/24;G01N21/84

主分类号：G01B11/24

摘要：The inspection apparatus for determination of the degree of ellipticity of an optical fiber perform and the eccentricity of the core thereof comprises optical system 12 for projecting a light beam from light source 10 through optical fiber preform 1 to video camera 11; and signal processing circuit 17 for converting the image of the optical fiber preform 1 photographed by the video camera 11 into a numerical value and the apparatus is connected to driving device 14 for rotating the optical fiber preform 1 traversing the optical path of the optical system 12 around the central axis of the preform 1. The curve showing the external shape of the optical fiber preform 1 is represented by the formula: v=(a-b)Sin2 theta and the line showing the external shape of the core represented by the formula: w=nU Sin theta +(n-1)(a-b)Sin(2 theta + alpha ). The eccentricity of the core can be calculated from these values.