Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1985-11-12
1987-07-07
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
G01N 2189
Patent
active
046783270
ABSTRACT:
Defects of infrared optical fibers during fabrication are inspected. The optical fiber runs from a fiber fabrication apparatus to a winding device. An integration sphere with a photodetector is placed at a point of the path of the running fiber. A light source shoots a light beam obliquely at the side surface of the running fiber or vertically at the beginning end of the fiber. Some portion of the light beam becomes propagating light. The defects of the fiber scatter the propagating light. The photodetector detects all the power of lights reflected within the diffuse reflective surface of the integration sphere. The output power of the photodetector is heightened to a higher level when a defect exists in the integration sphere, and the output power is lowered to a lower level when the defect exists between the outlet of the integration sphere and the light source. The position and extent of the defects are estimated by the change of the output power of the photodetector.
REFERENCES:
patent: 4021217 (1977-05-01), Bondybeyh et al.
Ogoshi et al., "Optical Fibers", published Nov. 1976, published by Kabushikigaisha Ohmsha, p. 323, Methods for Measuring Defect Points and Loss Distribution.
"An Introduction to Optical Fiber", Allen H. Cherin, McGraw Hill International Book Company (1983), Chap. eight, Fiber Measurements, pp. 187-216, especially in pp. 196-201, the backscattering method is described.
Takahashi Ken'ichi
Yoshida Noriyuki
McGraw Vincent P.
Sumitomo Electric Industries Ltd.
LandOfFree
Method for inspecting an optical fiber does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for inspecting an optical fiber, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for inspecting an optical fiber will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1659626