Apparatus for measuring the refractive index of an optical...

Details Apparatus for measuring the refractive index of an optical... Apparatus for measuring the refractive index of an optical...

G - Physics

01

N

73/53

G01N 21/41 (2006.01)

Patent

CA 1216759

APPARATUS FOR MEASURING THE REFRACTIVE INDEX OF AN OPTICAL FIBER ABSTRACT The apparatus described basically includes a vessel which has a horizontal transparent window and contains an index liquid. An optical fiber is mounted in this vessel perpendicular to the window. Light is launched and focused by a condenser onto fiber. The light cone of aperture angle due to the guided and leaky modes is eliminated using an annular mirror that reflects the remaining portion of the aperture light cone escaping laterally from the fiber. This light reflected by the mirror is focused by an annular con- denser and reflected onto a detector by a flat mirror with a hole in the center. Measuring the amount of light received by the detector allows the refractive index of the fiber to be determined.

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