Method of and apparatus for determining the refractive index...

Details Method of and apparatus for determining the refractive index... Method of and apparatus for determining the refractive index...

G - Physics

01

N

354/29, 73/57

G01N 21/41 (2006.01) G01N 21/45 (2006.01) G01J 9/04 (2006.01) G01N 21/35 (2006.01)

Patent

CA 1183365

ABSTRACT The invention allows the refractive index profile of an optical fibre or optical fibre preform to be obtained by phase difference measurements. A Zeeman effect laser generates a light beam of plane waves comprising two radiations with slightly different frequencies. The beam is split into its component radiations and the beats between the first radiation, which is made to follow a path outside the fibre or preform, and the second radia- tion, which is made to follow a path intersecting the fibre or preform, and is also subjected to phase shifts complementary to those produced by a reference fibre or preform, are generated in a photodetector; the phase differences between said beats and a reference beat are measured, and the refractive index profile compared to that of the reference fibre or preform is obtained from the phase difference values by suitable computing means.

419975

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