Title:
METHOD FOR MEASURING BACK RAMAN SCATTERED LIGHT OF OPTICAL FIBER
Document Type and Number:
Japanese Patent JPS63208730
Kind Code:
A
Abstract:
PURPOSE:To separate Raman scattered light from Rayleigh scattered light by projecting the Raman scattered light from a prism surface different from the incidence surface of a prism on which light from a light source is incident. CONSTITUTION:The laser light emitted by the light source 1 is diffused spectrally in the prism 10 and projected from a surface 10b, and light with specific wavelength lambda0 is incident on an optical fiber 4. The Stokes' light in the back Raman scattered light from the optical fiber 4 strikes on a surface 10c and is refracted by the surface 10c in a direction of separation from the Rayleigh scattered light and incident on a photodetector 7. The anti-stokes' light in the back scattered light, on the other hand, impinges on a reflecting film 15 provided to the surface 10a and is reflected to inside the prism 10 and emitted from a surface 10d and is made incident on the photodetection surface of a photodetector 9.
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Inventors:
YAMAMOTO SATORU
Application Number:
JP4036687A
Publication Date:
August 30, 1988
Filing Date:
February 25, 1987
Export Citation:
Assignee:
HITACHI CABLE
International Classes:
G01J3/44; G01N21/27; G01N21/65; G02B6/00; (IPC1-7): G01J3/44; G01N21/27; G02B6/00
Attorney, Agent or Firm:
Nobuo Kinutani
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