| 摘要 |
An apparatus is provided for inspecting holes in components. The apparatus comprises a telecentric lens system (3) positionable at a near end of a hole (2) with an optical axis of the lens system aligned with the axis of the hole to image the interior of the hole. The apparatus further comprises an illumination system for illuminating the interior of the hole. The apparatus further comprises a camera (5) arranged to receive an image of the illuminated interior of the hole from the telecentric lens system. The illumination system comprises a light source (11) for producing a beam of parallel light, and optics (13) for directing the produced beam through the telecentric lens system along the optical axis thereof, and through the hole. The beam reaches the far end of the hole, and is reflected from a surface located at or adjacent the far end of the hole to illuminate the interior of the hole. |
