Optical fibre device for directional optical sensor head - uses parallel optical fibres with differently angled light reception end faces

摘要

The optical fibres 21 to 24 are arranged parallel to one another in the vicinity of their end faces 21.1 - 24.1 on the receive side. The surface normals 21.2 - 24.2 of these end faces of at least a portion of the optical fibres are at an angle (other than zero) to the fibre longitudinal axis 21.3 - 24.3, the surface normals of at least a portion of the optical fibres having different orientations from one another. The surface normals preferably all meet at a point 25. <IMAGE>