公开(公告)号：US20160123873A1

公开(公告)日：2016-05-05

申请号：US14928018

申请日：2015-10-30

Applicant: Corning Incorporated

Inventor： Ian David Cook ,  Norman Henry Fontaine ,  Qi Wu ,  Jacques Gollier

IPC: G01N21/41

CPC classification number: G01N21/412 ,  G01M11/37

Abstract: According to some embodiments a method of measuring the refractive index profile of a consolidated glass body having a cylindrical surface comprises the steps of: (a) forming an image of a slit behind the glass body, (b) optionally pre-scanning the cylindrical surface of the test glass body or a reference glass body and analyzing the data within a fixed window to determine the likely location of the zero-order, un-diffracted beam while ignoring other diffracted beams; (c) optionally adjusting the optical power to improve the intensity of the data within the fixed window in order to improve the analysis; (d) predicting the trajectory of the zero-order beam through the preform based on the sampling location xi (incidence position) of the light impinging on the cylindrical surface and the location at which the zero-order beam impinges on the detector; (e) measuring the cylindrical surface of a glass body while using the estimated location of the zero-order beam and adjusted optical power to set the center of a floating window and the beam power at each measurement point; (e) determining deflection angles of the exiting zero-order beam within the floating window at each sampling location; (e) calculating the refractive index profile of glass body by utilizing a transformation function which determines refractive index at each location based upon the measured deflection angle function of the beam.

Abstract translation: 根据一些实施例，测量具有圆柱形表面的固结玻璃体的折射率分布的方法包括以下步骤：（a）在玻璃体后面形成狭缝的图像，（b）任选地预先扫描圆柱形表面 测试玻璃体或参考玻璃体，并在固定窗口内分析数据以确定零级非衍射光束的可能位置，同时忽略其他衍射光束; （c）可选地调整光功率以改善固定窗内数据的强度，以便改进分析; （d）基于撞击在圆柱形表面上的光的采样位置xi（入射位置）和零级光束撞击检测器的位置，预测零阶光束通过预制棒的轨迹; （e）在使用零级光束的估计位置并调整光功率来设置浮动窗口的中心和每个测量点处的光束功率时，测量玻璃体的圆柱形表面; （e）在每个采样位置确定浮动窗口内出现的零级波束的偏转角; （e）通过利用基于所测量的光束的偏转角函数来确定每个位置处的折射率的变换函数来计算玻璃体的折射率分布。

公开(公告)号：US20230094509A1

公开(公告)日：2023-03-30

申请号：US17951695

申请日：2022-09-23

Applicant: CORNING INCORPORATED

Inventor： John Steele Abbott, III ,  Scott Robertson Bickham ,  Amanda Lee Billings ,  Ian David Cook ,  Simit Mayank Patel

IPC: G01M11/02 ,  G01M11/00 ,  B07C5/342 ,  G05B19/4155 ,  C03B37/025 ,  C03B37/027 ,  C03B37/018

Abstract: Methods for classifying a core cane of an multimode optical fiber are disclosed. In embodiments, the method includes determining a relative refractive index profile Δ(r) of the core cane; fitting the relative refractive index profile Δ(r) to an alpha profile Δfit(r) defined by: Δ fit ( r ) = Δ o , fit ( 1 - ( r a fit ) α fit ) where Δo,fit is a relative refractive index at a longitudinal centerline of the core cane, αfit is a core shape parameter, and afit is an outer radius of the core cane; generating a non-alpha residual profile Δdiff(r)=Δ(r)−Δfit(r) for the core cane; computing one or more metrics from Δdiff(r), and using the one or metrics in a classification of the core cane, the classification comprising a prediction of whether a bandwidth at a pre-determined wavelength of an optical fiber drawn from a preform comprising the core cane exceeds a pre-determined bandwidth at the pre-determined wavelength.

公开(公告)号：US09989458B2

公开(公告)日：2018-06-05

申请号：US14928018

申请日：2015-10-30

Applicant: Corning Incorporated

Inventor： Ian David Cook ,  Norman Henry Fontaine ,  Qi Wu ,  Jacques Gollier

IPC: G01N21/41 ,  G01N21/00 ,  G01M11/00

CPC classification number: G01N21/412 ,  G01M11/37

Abstract: According to some embodiments a method of measuring the refractive index profile of a consolidated glass body having a cylindrical surface comprises the steps of: (a) forming an image of a slit behind the glass body; (b) optionally pre-scanning the cylindrical surface of the test glass body or a reference glass body and analyzing the data within a fixed window to determine the likely location of the zero-order, un-diffracted beam while ignoring other diffracted beams; (c) optionally adjusting the optical power to improve the intensity of the data within the fixed window in order to improve the analysis; (d) predicting the trajectory of the zero-order beam through the preform based on the sampling location xi (incidence position) of the light impinging on the cylindrical surface and the location at which the zero-order beam impinges on the detector; (e) measuring the cylindrical surface of a glass body while using the estimated location of the zero-order beam and adjusted optical power to set the center of a floating window and the beam power at each measurement point; (e) determining deflection angles of the exiting zero-order beam within the floating window at each sampling location; (e) calculating the refractive index profile of glass body by utilizing a transformation function which determines refractive index at each location based upon the measured deflection angle function of the beam.