Showing papers on "Fiber optic sensor published in 1970"
NEC1
TL;DR: In this article, a lens-like glass fiber guide with a parabolic variation of refractive index has been developed, which has the following characteristics: simultaneous transmission of laser beams modulated by wide-band signals through narrow space; optical image transmission; realization of a lens with tiny aperture or with extremely short focal length.
Abstract: A lenslike glass fiber guide with a parabolic variation of refractive index has been developed. This optical guide named SELFOC® has the following characteristics: simultaneous transmission of laser beams modulated by wide-band signals through narrow space; optical image transmission; realization of a lens with tiny aperture or with extremely short focal length; and the possibility of being bent with a small radius of curvature without spoiling transmission characteristics. In the case of a typical fiber guide with length 1 meter and diameter 0.3 mm, transmission loss is about 0.2 dB and depolarization is about 20 dB at wavelength 0.63μ. The mode pattern of a laser beam after passing through the fiber guide is scarcely deformed. The fiber guide can be used as a transmission line or lens, in optical communication, optical data processing, and optical instruments.
167 citations
Patent•
23 Dec 1970
TL;DR: In this article, a multi-terminal optical cable includes an optical focusing fiber having a refractive index distribution in which the index varies in substantial inverse proportion to the square of the radial distance form the central longitudinal axis of the fiber to its outer periphery.
Abstract: A multi-terminal optical cable includes an optical focusing fiber having a refractive index distribution in which the index varies in substantial inverse proportion to the square of the radial distance form the central longitudinal axis of the fiber to its outer periphery. A plurality of input electrical signals are converted into corresponding light signals at one end of the fiber. Those light signals are imaged by the fiber in a one-toone relationship on an array of light-sensing elements at the other end of the fiber at which the light images are reconverted to electrical signals, corresponding to the input electrical signals.
35 citations
Patent•
09 Jan 1970
TL;DR: In this paper, a collimator fiber optics or an optical mask are used to give a higher resolution optical fibers may have a second coating of EMA or an occasional optically absorbent fiber may be placed parallel to the optic fibers in order to cut down crosstalk and introduce an absorbent medium between the fibers Coherent fiber optics may be used
Abstract: In order to detect can weld side-seam flaws or defects an infrared sensitive detector head is used A collimator fiber optics or an optical mask are used to give a higher resolution Optical fibers may have a second coating of EMA or an occasional optically absorbent fiber may be placed parallel to the optic fibers in order to cut down crosstalk and introduce an absorbent medium between the fibers Coherent fiber optics may be used
20 citations