| 摘要 |
<p>The device is intended in particular for inspecting circular-cross-section sealing rings known as O-rings. Two radiation sources (10, 11) are provided emitting radiation (12, 15) of a given frequency. The common light beam (16) is directed on to the surface to be checked (29) of the O-ring (24) by means of a beam forming system (20) and a first rotary mirror (21) as well as by a concentrating lens (22). The radiation (30) reflected from the surface (29) arrives at an arrangement of sensors (33) after passing through another convex lens (31) and deflection by a second rotary mirror (32). The sensor arrangement (33) comprises a first radiation sensor (34) which sends to an evaluation unit (35) an output signal which depends on the point of impingement of the radiation on the active surface (36) of the first sensor (34). Two further radiation sensors (35, 44, 49) are provided which supply the evaluation unit (35) with an output signal that varies according to the radiation intensity of said sensors (44, 49). Upstream of the latter are arranged colour-permeable filters (42, 47), the pass-band of one filter (42) being modulated to the radiation frequency (15) of the first radiation source (10), and that of the other filter (47) being modulated to the other radiation frequency (12) of the second radiation source (11). The apparatus described automatically identifies faults characterized by different geometrical and colour markings on the O-ring surface (29).</p> |
