公开(公告)号：US4515475A

公开(公告)日：1985-05-07

申请号：US308542

申请日：1981-10-01

申请人： David N. Payne ,  Issei Sasaki ,  Michael J. Adams

发明人： David N. Payne ,  Issei Sasaki ,  Michael J. Adams

IPC分类号： G01M11/02 ,  G01N21/41 ,  G01N21/47

CPC分类号： G01N21/412

摘要： A method of sensing the optical deflection function of an approximately cylindrical object, such as an optical fibre preform, comprises illuminating the object with collimated light; focusing the transmitted light so that in the focal plane the distance of the light from the optical axis is linearly proportional to the angle through which light has been deviated by the object; optically modulating the focused light so that a property of the light varies as a function of said distance, and calculating the deflection function from the modulated light. The modulations may be spatial or temporal. The refractive index profile can also be calculated.

摘要翻译： PCT No.PCT / GB81 / 00040 Sec。 371日期：1981年10月1日 102（e）日期1981年10月1日PCT提交1981年3月11日PCT公布。 出版物WO81 / 02634 日期：1981年9月17日。一种感测近似圆柱形物体（诸如光纤预制棒）的光学偏转功能的方法包括用准直光照射物体; 聚焦透射光，使得在焦平面中，光从光轴的距离与光被物体偏离的角度成线性比例; 光调制聚焦光，使得光的性质根据所述距离而变化，并从调制光计算偏转函数。 调制可能是空间或时间。 还可以计算折射率分布。

公开(公告)号：US06919954B2

公开(公告)日：2005-07-19

申请号：US10149413

申请日：2001-06-12

申请人： Issei Sasaki ,  Fujio Kato

发明人： Issei Sasaki ,  Fujio Kato

IPC分类号： G01M11/02 ,  G01M11/08 ,  G01N21/41 ,  G01N21/00

CPC分类号： G01N21/412 ,  G01M11/088

摘要： The invention relates to a method and system for measuring the internal refractive index of an optical fiber preform with high precision. The internal refractive index of an optical fiber preform (2) is measured from the state of bending of a light ray (4) passing across the optical fiber preform (2), so that the refractive index distribution of the optical fiber preform (2) is found on the basis of the angle of bending of the light ray calculated from a specific relation between a light ray start position (8) and a light ray detection position (9). The surface of a light source (1) is scanned by a knife-edge (6) and the light ray start position (8) on the light source is determined depending on the interception of the light ray (4) by the knife-edge (6) or the de-interception of the light ray, thereby learning the start position (8) of the detected light ray (4) on the light source (1).

摘要翻译： 本发明涉及一种高精度测量光纤预制件的内部折射率的方法和系统。 从通过光纤预制件（2）的光线（4）的弯曲状态测量光纤预制件（2）的内部折射率，使得光纤预制件（2）的折射率分布 基于从光线开始位置（8）和光线检测位置（9）之间的特定关系计算的光线的弯曲角度来找到。 光源（1）的表面被刀刃（6）扫描，并且光源上的光线开始位置（8）根据光线（4）被刀刃的截取来确定 （6）或解除光线，从而学习光源（1）上检测到的光线（4）的开始位置（8）。

公开(公告)号：US4640615A

公开(公告)日：1987-02-03

申请号：US660923

申请日：1984-10-15

申请人： Issei Sasaki

发明人： Issei Sasaki

IPC分类号： G01J4/00 ,  G01J9/04 ,  G01N21/21 ,  G01N21/41 ,  G01N21/45 ,  G02B6/00 ,  G02B27/28

CPC分类号： G01N21/45 ,  G01J4/00 ,  G01J9/04

摘要： A liquid refractometer comprising a light source unit, a probe unit and a detection unit. The light source unit generates a beam of polarized mixed light composed of two coherent light waves that have been linearly polarized in directions at right angles to each other. The probe unit contains a polarization separation portion, a sample holding portion, a reference portion and a beam mixing portion. The polarization separation portion separates the mixed light beam back into the two polarized waves and directs one of the beams through the sample portion and the other beam through the reference portion. The mixing portion re-mixes the two waves after having passed through the sample holding portion and the reference portion. The detection unit receives the re-mixed light and measures the refractive index differences between the liquid sample and the reference portion. Fiber optics optically connect the light source unit, the probe unit and the detector unit.

摘要翻译： 一种液体折射计，包括光源单元，探针单元和检测单元。 光源单元产生由彼此成直角的方向线性极化的两个相干光波组成的偏振混合光束。 探针单元包含偏振分离部分，样本保持部分，参考部分和光束混合部分。 偏振分离部分将混合光束分离成两个偏振波，并将一个光束通过样本部分，另一个光束通过参考部分。 混合部分在通过样品保持部分和参考部分之后重新混合两个波。 检测单元接收再混合光并测量液体样品与参考部分之间的折射率差异。 光纤光学连接光源单元，探头单元和检测器单元。

公开(公告)号：US06611321B1

公开(公告)日：2003-08-26

申请号：US09412500

申请日：1999-10-05

申请人： Issei Sasaki

发明人： Issei Sasaki

IPC分类号： G01N2100

CPC分类号： G01N21/412

摘要： The internal refractive index distribution of an optical fiber preform is measured by providing a generally-cylindrical optical fiber preform having an uneven internal refractive index distribution. A picture image is placed at one side of the optical fiber preform, and a deflected picture of the picture image is photographed through the optical fiber preform using a photographing unit placed at the other side of the optical fiber preform. A deflection function is obtained by analyzing the deflected picture of the picture image. The internal refractive index distribution of the optical fiber preform is measured in accordance with the deflection function obtained.

摘要翻译： 通过提供具有不均匀的内部折射率分布的大致圆柱形的光纤预制件来测量光纤预制棒的内部折射率分布。 将图像放置在光纤预制件的一侧，并且使用放置在光纤预制件的另一侧的拍摄单元通过光纤预制件拍摄图像的偏转图像。 通过分析图像的偏转图像获得偏转函数。 根据获得的偏转函数测量光纤预制棒的内部折射率分布。

公开(公告)号：US4519704A

公开(公告)日：1985-05-28

申请号：US476465

申请日：1983-03-18

申请人： Robert J. Mansfield ,  David N. Payne ,  Issei Sasaki

发明人： Robert J. Mansfield ,  David N. Payne ,  Issei Sasaki

IPC分类号： G01N21/41

CPC分类号： G01N21/412

摘要： To determine the radial profile of the refractive index of a substantially cylindrical transparent object such as an optical fibre or optical fibre preform, the object is illuminated with a collimated beam of light incident at an angle to the axis of the cylindrical object differing substantially from 90 degrees and measuring the refraction angle at which light leaves a substantially plane endface as a function of the radial position on the endface.

摘要翻译： 为了确定基本上圆柱形的透明物体（例如光纤或光纤预制棒）的折射率的径向轮廓，用与圆柱形物体的轴线成一定角度入射的准直光束照射物体，其基本上不同于90° 测量光离开基本平面端面的折射角，作为端面上的径向位置的函数。