Title:
DEVICE FOR MEASURING SPOT-SIZE OF BEAM
Document Type and Number:
Japanese Patent JPS59166821
Kind Code:
A
Abstract:
Apparatus for measuring the spot size of light emerging from an optical fibre comprises a rotating radial grating which is moved relative to a monochromatic beam of light, passing through the fibre, to vary the spatial frequency of the light entering a photodetector situated at the output end of the optical fibre, thereby obtaining a variation in the modulation amplitude of the light received by the detector allowing measurement of the spot size to be obtained.
Inventors:
UIRIAMU JIEEMUSU SUCHIYUAATO
Application Number:
JP24227983A
Publication Date:
September 20, 1984
Filing Date:
December 23, 1983
Export Citation:
Assignee:
PLESSEY OVERSEAS
International Classes:
G01J1/42; G01B11/08; G02B6/00; (IPC1-7): G01J1/02; G01M11/02; G02B5/14
Attorney, Agent or Firm:
Asamura Akira