Method of inspecting transparent rods

Details Method of inspecting transparent rods Method of inspecting transparent rods

G - Physics

01

N

73/111, 240/88

G01N 21/88 (2006.01) G01N 21/41 (2006.01)

Patent

CA 1206350

- 8 - ABSTRACT METHOD OF INSPECTING TRANSPARENT RODS Various techniques for examining the core region of optical fibres and fibre preforms involve placing a portion of the fibre preform in an index- matching fluid and transversely illuminating the immersed portion. As described herein, the need for an index- matching fluid can be eliminated by illuminating the fibre preform (12) with a diverging beam (14). By the suitable selection of parameters, refraction at the air-fibre/preform interface can produce a well colliminated beam within the core region (11). The diverging beam (14) can be produced by means of a cylindrical rod lens arranged parallel to the fibre/ preform 12.

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