Method of and apparatus for the measurement of the...

Details Method of and apparatus for the measurement of the... Method of and apparatus for the measurement of the...

G - Physics

01

N

354/29, 73/57

G01N 21/84 (2006.01) G01M 11/00 (2006.01) G01N 21/41 (2006.01)

Patent

CA 1235923

ABSTRACT The present invention provides a method which is of the guided near field type so as to exploit fibre propagation characteristics, and requires no complex processing of a measured value. In this method, an image of the fibre output end is radially scanned, and for each value of a distance r from the image axis, two image-intensity measurements are effected, the first after optically filtering the beam emerging from the fibre so as to modulate the beam according to a factor p4 (with p = a ? sin .THETA., .THETA. being the angular beam coordinate, and a the dis- tance of the generic filter point from the fibre output end), the second meansurement being effected by directly collecting the beam leaving the fibre end, the refractive index value at that point being derived from the ratio between the first and the second measurement.

497701

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