Apparatus for determining the refractive index profile of...

Details Apparatus for determining the refractive index profile of... Apparatus for determining the refractive index profile of...

G - Physics

01

N

354/29, 73/53

G01N 21/41 (2006.01)

Patent

CA 1193880

ABSTRACT The apparatus comprises an opaque screen, which is placed between a light source and a fibre or preform whose refrac- tive index profile is to be determined. The screen has an oblique slit which forms a beam illuminating a plane section of the fibre or preform, and an optical system forms a near- field image of the beam incident on the fibre or preform and a far-field image of the refracted beam, in two perpen- dicular directions on a photosensitive screen. The image formed on the screen is scanned by the scanning system of a television camera of which the photosensitive screen forms part, and the deflection function and hence the refractive index profile are obtained from the coordinates of the points of maximum brightness by using a computing system.

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